Saturday, August 30, 2014

Purlin - Roof Sheathing - Dormer Square Tail Fascia Layover Cuts

Purlin Rafters, Roof Sheathing or Dormer Square Tail Fascia Layover Cuts
(Cutting Roof Sheathing with an Edge Bevel)

Cutting Purlin Rafters from the Face Set in the Roof Surface
Saw Blade Miter = arctan (sin Dormer Pitch Angle ÷ tan Main Pitch Angle)
Saw Blade Miter = arctan (sin 26.56505 ÷ tan 33.69007) = 33.85451°
Saw Blade Bevel = arcsin (cos Main Pitch Angle × cos Dormer Pitch Angle)
Saw Blade Bevel = arcsin (cos 33.69007 × cos 26.56505) = 48.09115°
or use
Jack Rafter Side Cut Angle for the Miter Angle
Valley Sleeper Saw Blade Bevel Angle  for the Saw Blade Bevel Angle

Example
Roof Eave Angle = 90.00000
SS = Main Rafter Slope Angle = 33.69007 -- 8:12
S = Adjacent Rafter Slope Angle = 26.56505 -- 6:12

DD = Main Plan Angle = 36.86990
D = Adjacent Plan Angle = 53.13010

R1 = Hip Rafter Slope Angle = 21.80141
C5m Main Hip Rafter Backing Angle = 26.34404
C5a Adjacent Hip Rafter Backing Angle = 15.56481
Valley Sleeper Saw Blade Bevel Angle = 90° - (C5m + C5a) = 48.09115

P2m = Main Jack Rafter Side Cut Angle = 47.96889
90° - P2m = Main Roof Sheathing Angle = 42.03111
P2a = Adjacent Jack Rafter Side Cut Angle = 33.85451
90° - P2a = Adjacent Roof Sheathing Angle = 56.14549

Cutting Purlin Rafters from the Face Set in the Roof Surface
or
Cutting Roof Sheathing with an Edge Bevel

Jack Rafter Side Cut Angle for the Miter Angle -- 33.85451°
Valley Sleeper Saw Blade Bevel Angle  for the Saw Blade Bevel Angle -- 48.09115°



Cutting Purlin Rafters from Face perpendicular to Roof
Saw Blade Miter = arctan (cos Dormer Pitch Angle ÷ tan Main Roof Pitch Angle)
Saw Blade Miter = arctan (cos 26.56505 ÷ tan 33.69007) = 53.30077°
Saw Blade Bevel = arcsin (cos Main Roof Pitch Angle × sin Dormer Pitch Angle)
Saw Blade Bevel = arcsin (cos 33.69007 × sin 26.56505) = 21.84545°








Friday, August 29, 2014

Twisted Steeple Geometry

Here's my first attempt for developing the geometry of the twisted steeple. This twisted steeple has an Octagonal base  for the rotation of the twist. It also sets on top of a square base for the connection to a church roof.




Clocher tors -- Twisted Steeples -- Belfray



I started off with an Octagon, 36" diameter for the circumscribed radius.  


Then I used a height of 50" for the peak of the steeple and drew in the hip rafters.


Then I divided the roof peak height into 5 equal heights. For the 5 Octagonal platforms.


Draw in the Octagonal platforms and rotate each Octagonal platform by 22.5°.


Octagonal platforms rotated 22.5°.



With the Octagonal platforms drawn in I added the hip rafters.

Here's the plan view the twisted steeple.


Hip Rafter Slope Angles and plan Angles for each of the Octagonal platforms.





Here's the plan view of the twisted steeple with the plan view of the square base.


In the next post I'll develop the geometry for the hip rafter backing angle for each of the Octagonal platforms.



Sunday, August 17, 2014

Plywood Roof Sheathing Stick

Most of the time we just snap a chalk line down the hip rafter to cut the plywood roof sheathing. However, when the roof slope angle is steeper than an 8:12 pitched roof, 33.69007°, we will cut the plywood roof sheathing that attaches to the hip or valley rafter on the ground.  The easiest way to make an Roof Sheathing Stick is to lay the first plywood sheathe across the hip rafter and lay a stick parallel with the hip rafter and drive two nails next to the hip rafter.   AKA -- Okie Roof Stick,  something my father taught me. No math, just a couple of nails.







To make an Roof Sheathing Stick on the ground you can use the plywood cut off dimension, included in both of my Android and iPhone RafterTools apps. Simply mark off the plywood cut off, offset, dimension and snap a line for the plywood sheathing diagonal. Then lay a stick next to the diagonal line and drive two nails next to the edge of the plywood.

You can also use a framing square to layout the roof sheathing angle on the plywood using 12" and the length of the common rafter per 12" of run. Not very accurate on a 48" wide piece of plywood, but it works.



Math or Trigonometry for the Roof Sheathing Stick.


For Unequal -- Irregular -- Bastard pitched roofs.

Sheathing Angle = arctan(tan(Plan Angle) ÷ cos(Roof Slope Angle))
Plywood Offset Dimension = 48 / tan(Sheathing Angle)
Roof Sheathing Stick (Diagonal) = 48 / sin(Sheathing Angle)


For Equal Pitched Roofs:

Roof Slope Angles for Roof Pitch
1:12 = 4.76364°
2:12 = 9.46232°
3:12 = 14.03624°
4:12 = 18.43495°
5:12 = 22.61986°
6:12 = 26.56505°
7:12 = 30.25644°
8:12 = 33.69007°
9:12 = 36.86990°
10:12 = 39.80557°
11:12 = 42.51045°
12:12 = 45.00000°
13:12 = 47.29061°
14:12 = 49.39871°
15:12 = 51.34019°
16:12 = 53.13010°
17:12 = 54.78241°
18:12 = 56.30993°
19:12 = 57.72436°
20:12 = 59.03624°
21:12 = 60.25512°
22:12 = 61.38954°
23:12 = 62.44719°
24:12 = 63.43495°

Roof Sheathing Angles for Equal Roof Pitch
1:12 = 45.09913°
2:12 = 45.39245°
3:12 = 45.86825°
4:12 = 46.50848°
5:12 = 47.29061°
6:12 = 48.18969°
7:12 = 49.18024°
8:12 = 50.23784°
9:12 = 51.34019°
10:12 = 52.46776°
11:12 = 53.60406°
12:12 = 54.73561°
13:12 = 55.85174°
14:12 = 56.94427°
15:12 = 58.00718°
16:12 = 59.03624°
17:12 = 60.02867°
18:12 = 60.98286°
19:12 = 61.89810°
20:12 = 62.77437°
21:12 = 63.61220°
22:12 = 64.41247°
23:12 = 65.17634°
24:12 = 65.90516°

Roof Sheathing Plywood Offset for Equal Roof Pitch
1:12 = 3'-11 7/8''
2:12 = 3'-11 3/8''
3:12 = 3'-10 5/8''
4:12 = 3'-9 9/16''
5:12 = 3'-8 5/16''
6:12 = 3'-6 15/16''
7:12 = 3'-5 1/2''
8:12 = 3'-3 15/16''
9:12 = 3'-2 7/16''
10:12 = 3'-0 7/8''
11:12 = 2'-11 7/16''
12:12 = 2'-9 15/16''
13:12 = 2'-8 9/16''
14:12 = 2'-7 1/4''
15:12 = 2'-6''
16:12 = 2'-4 13/16''
17:12 = 2'-3 11/16''
18:12 = 2'-2 11/16''
19:12 = 2'-1 11/16''
20:12 = 2'-0 3/4''
21:12 = 1'-11 7/8''
22:12 = 1'-11''
23:12 = 1'-10 1/4''
24:12 = 1'-9 1/2''

Roof Sheathing Plywood Marking Stick for Equal Roof Pitch(diagonal--hip length)
1:12 = 5'-7 13/16''
2:12 = 5'-7 7/16''
3:12 = 5'-6 15/16''
4:12 = 5'-6 3/16''
5:12 = 5'-5 3/8''
6:12 = 5'-4 7/16''
7:12 = 5'-3 7/16''
8:12 = 5'-2 1/2''
9:12 = 5'-1 1/2''
10:12 = 5'-0 9/16''
11:12 = 4'-11 11/16''
12:12 = 4'-10 13/16''
13:12 = 4'-10''
14:12 = 4'-9 5/16''
15:12 = 4'-8 5/8''
16:12 = 4'-7 15/16''
17:12 = 4'-7 7/16''
18:12 = 4'-6 15/16''
19:12 = 4'-6 7/16''
20:12 = 4'-6''
21:12 = 4'-5 5/8''
22:12 = 4'-5 1/4''
23:12 = 4'-4 15/16''
24:12 = 4'-4 5/8''


Roof Sheathing Plywood Offset for Irregular Roof Pitches
Main Plywood Offset -- Adjacent Plywood Offset

Main Pitch 1:12
Adjacent Pitch 1:12 = 3'-11 7/8'' -- 3'-11 7/8''
Adjacent Pitch 2:12 = 1'-11 15/16'' -- 7'-10 3/4''
Adjacent Pitch 3:12 = 1'-3 15/16'' -- 11'-7 3/4''
Adjacent Pitch 4:12 = 0'-11 15/16'' -- 15'-2 3/16''
Adjacent Pitch 5:12 = 0'-9 5/8'' -- 18'-5 9/16''
Adjacent Pitch 6:12 = 0'-7 15/16'' -- 21'-5 5/8''
Adjacent Pitch 7:12 = 0'-6 7/8'' -- 24'-2 1/4''
Adjacent Pitch 8:12 = 0'-6'' -- 26'-7 9/16''
Adjacent Pitch 9:12 = 0'-5 3/8'' -- 28'-9 5/8''
Adjacent Pitch 10:12 = 0'-4 13/16'' -- 30'-8 3/4''
Adjacent Pitch 11:12 = 0'-4 3/8'' -- 32'-5 1/4''
Adjacent Pitch 12:12 = 0'-4'' -- 33'-11 5/16''
Adjacent Pitch 13:12 = 0'-3 11/16'' -- 35'-3 1/4''
Adjacent Pitch 14:12 = 0'-3 7/16'' -- 36'-5 3/8''
Adjacent Pitch 15:12 = 0'-3 1/4'' -- 37'-5 13/16''
Adjacent Pitch 16:12 = 0'-3'' -- 38'-4 13/16''

Main Pitch 2:12
Adjacent Pitch 1:12 = 7'-10 3/4'' -- 1'-11 15/16''
Adjacent Pitch 2:12 = 3'-11 3/8'' -- 3'-11 3/8''
Adjacent Pitch 3:12 = 2'-7 5/8'' -- 5'-9 7/8''
Adjacent Pitch 4:12 = 1'-11 11/16'' -- 7'-7 1/8''
Adjacent Pitch 5:12 = 1'-6 15/16'' -- 9'-2 13/16''
Adjacent Pitch 6:12 = 1'-3 13/16'' -- 10'-8 13/16''
Adjacent Pitch 7:12 = 1'-1 9/16'' -- 12'-1 1/8''
Adjacent Pitch 8:12 = 0'-11 7/8'' -- 13'-3 13/16''
Adjacent Pitch 9:12 = 0'-10 9/16'' -- 14'-4 13/16''
Adjacent Pitch 10:12 = 0'-9 1/2'' -- 15'-4 3/8''
Adjacent Pitch 11:12 = 0'-8 5/8'' -- 16'-2 5/8''
Adjacent Pitch 12:12 = 0'-7 15/16'' -- 16'-11 11/16''
Adjacent Pitch 13:12 = 0'-7 5/16'' -- 17'-7 5/8''
Adjacent Pitch 14:12 = 0'-6 13/16'' -- 18'-2 11/16''
Adjacent Pitch 15:12 = 0'-6 3/8'' -- 18'-8 15/16''
Adjacent Pitch 16:12 = 0'-5 15/16'' -- 19'-2 7/16''

Main Pitch 3:12
Adjacent Pitch 1:12 = 11'-7 3/4'' -- 1'-3 15/16''
Adjacent Pitch 2:12 = 5'-9 7/8'' -- 2'-7 5/8''
Adjacent Pitch 3:12 = 3'-10 5/8'' -- 3'-10 5/8''
Adjacent Pitch 4:12 = 2'-10 15/16'' -- 5'-0 3/4''
Adjacent Pitch 5:12 = 2'-3 15/16'' -- 6'-1 7/8''
Adjacent Pitch 6:12 = 1'-11 5/16'' -- 7'-1 7/8''
Adjacent Pitch 7:12 = 1'-7 15/16'' -- 8'-0 3/4''
Adjacent Pitch 8:12 = 1'-5 1/2'' -- 8'-10 9/16''
Adjacent Pitch 9:12 = 1'-3 9/16'' -- 9'-7 1/4''
Adjacent Pitch 10:12 = 1'-1 15/16'' -- 10'-2 15/16''
Adjacent Pitch 11:12 = 1'-0 3/4'' -- 10'-9 3/4''
Adjacent Pitch 12:12 = 0'-11 11/16'' -- 11'-3 13/16''
Adjacent Pitch 13:12 = 0'-10 3/4'' -- 11'-9 1/8''
Adjacent Pitch 14:12 = 0'-10'' -- 12'-1 13/16''
Adjacent Pitch 15:12 = 0'-9 3/8'' -- 12'-5 15/16''
Adjacent Pitch 16:12 = 0'-8 3/4'' -- 12'-9 5/8''

Main Pitch 4:12
Adjacent Pitch 1:12 = 15'-2 3/16'' -- 0'-11 15/16''
Adjacent Pitch 2:12 = 7'-7 1/8'' -- 1'-11 11/16''
Adjacent Pitch 3:12 = 5'-0 3/4'' -- 2'-10 15/16''
Adjacent Pitch 4:12 = 3'-9 9/16'' -- 3'-9 9/16''
Adjacent Pitch 5:12 = 3'-0 7/16'' -- 4'-7 7/16''
Adjacent Pitch 6:12 = 2'-6 3/8'' -- 5'-4 7/16''
Adjacent Pitch 7:12 = 2'-2 1/16'' -- 6'-0 9/16''
Adjacent Pitch 8:12 = 1'-10 13/16'' -- 6'-7 15/16''
Adjacent Pitch 9:12 = 1'-8 1/4'' -- 7'-2 7/16''
Adjacent Pitch 10:12 = 1'-6 1/4'' -- 7'-8 3/16''
Adjacent Pitch 11:12 = 1'-4 9/16'' -- 8'-1 5/16''
Adjacent Pitch 12:12 = 1'-3 3/16'' -- 8'-5 7/8''
Adjacent Pitch 13:12 = 1'-2 1/16'' -- 8'-9 13/16''
Adjacent Pitch 14:12 = 1'-1 1/16'' -- 9'-1 3/8''
Adjacent Pitch 15:12 = 1'-0 3/16'' -- 9'-4 1/2''
Adjacent Pitch 16:12 = 0'-11 7/16'' -- 9'-7 1/4''

Main Pitch 5:12
Adjacent Pitch 1:12 = 18'-5 9/16'' -- 0'-9 5/8''
Adjacent Pitch 2:12 = 9'-2 13/16'' -- 1'-6 15/16''
Adjacent Pitch 3:12 = 6'-1 7/8'' -- 2'-3 15/16''
Adjacent Pitch 4:12 = 4'-7 7/16'' -- 3'-0 7/16''
Adjacent Pitch 5:12 = 3'-8 5/16'' -- 3'-8 5/16''
Adjacent Pitch 6:12 = 3'-0 15/16'' -- 4'-3 9/16''
Adjacent Pitch 7:12 = 2'-7 11/16'' -- 4'-10 1/16''
Adjacent Pitch 8:12 = 2'-3 3/4'' -- 5'-3 15/16''
Adjacent Pitch 9:12 = 2'-0 5/8'' -- 5'-9 1/8''
Adjacent Pitch 10:12 = 1'-10 3/16'' -- 6'-1 3/4''
Adjacent Pitch 11:12 = 1'-8 3/16'' -- 6'-5 7/8''
Adjacent Pitch 12:12 = 1'-6 1/2'' -- 6'-9 1/2''
Adjacent Pitch 13:12 = 1'-5 1/16'' -- 7'-0 11/16''
Adjacent Pitch 14:12 = 1'-3 7/8'' -- 7'-3 1/2''
Adjacent Pitch 15:12 = 1'-2 13/16'' -- 7'-5 15/16''
Adjacent Pitch 16:12 = 1'-1 7/8'' -- 7'-8 3/16''

Main Pitch 6:12
Adjacent Pitch 1:12 = 21'-5 5/8'' -- 0'-7 15/16''
Adjacent Pitch 2:12 = 10'-8 13/16'' -- 1'-3 13/16''
Adjacent Pitch 3:12 = 7'-1 7/8'' -- 1'-11 5/16''
Adjacent Pitch 4:12 = 5'-4 7/16'' -- 2'-6 3/8''
Adjacent Pitch 5:12 = 4'-3 9/16'' -- 3'-0 15/16''
Adjacent Pitch 6:12 = 3'-6 15/16'' -- 3'-6 15/16''
Adjacent Pitch 7:12 = 3'-0 13/16'' -- 4'-0 3/8''
Adjacent Pitch 8:12 = 2'-8 1/4'' -- 4'-5 5/16''
Adjacent Pitch 9:12 = 2'-4 5/8'' -- 4'-9 5/8''
Adjacent Pitch 10:12 = 2'-1 13/16'' -- 5'-1 1/2''
Adjacent Pitch 11:12 = 1'-11 7/16'' -- 5'-4 7/8''
Adjacent Pitch 12:12 = 1'-9 1/2'' -- 5'-7 15/16''
Adjacent Pitch 13:12 = 1'-7 7/8'' -- 5'-10 9/16''
Adjacent Pitch 14:12 = 1'-6 7/16'' -- 6'-0 15/16''
Adjacent Pitch 15:12 = 1'-5 3/16'' -- 6'-2 15/16''
Adjacent Pitch 16:12 = 1'-4 1/8'' -- 6'-4 13/16''

Main Pitch 7:12
Adjacent Pitch 1:12 = 24'-2 1/4'' -- 0'-6 7/8''
Adjacent Pitch 2:12 = 12'-1 1/8'' -- 1'-1 9/16''
Adjacent Pitch 3:12 = 8'-0 3/4'' -- 1'-7 15/16''
Adjacent Pitch 4:12 = 6'-0 9/16'' -- 2'-2 1/16''
Adjacent Pitch 5:12 = 4'-10 1/16'' -- 2'-7 11/16''
Adjacent Pitch 6:12 = 4'-0 3/8'' -- 3'-0 13/16''
Adjacent Pitch 7:12 = 3'-5 1/2'' -- 3'-5 1/2''
Adjacent Pitch 8:12 = 3'-0 5/16'' -- 3'-9 11/16''
Adjacent Pitch 9:12 = 2'-8 1/4'' -- 4'-1 3/8''
Adjacent Pitch 10:12 = 2'-5 1/16'' -- 4'-4 11/16''
Adjacent Pitch 11:12 = 2'-2 7/16'' -- 4'-7 5/8''
Adjacent Pitch 12:12 = 2'-0 3/16'' -- 4'-10 3/16''
Adjacent Pitch 13:12 = 1'-10 3/8'' -- 5'-0 1/2''
Adjacent Pitch 14:12 = 1'-8 3/4'' -- 5'-2 1/2''
Adjacent Pitch 15:12 = 1'-7 3/8'' -- 5'-4 5/16''
Adjacent Pitch 16:12 = 1'-6 3/16'' -- 5'-5 7/8''

Main Pitch 8:12
Adjacent Pitch 1:12 = 26'-7 9/16'' -- 0'-6''
Adjacent Pitch 2:12 = 13'-3 13/16'' -- 0'-11 7/8''
Adjacent Pitch 3:12 = 8'-10 9/16'' -- 1'-5 1/2''
Adjacent Pitch 4:12 = 6'-7 15/16'' -- 1'-10 13/16''
Adjacent Pitch 5:12 = 5'-3 15/16'' -- 2'-3 3/4''
Adjacent Pitch 6:12 = 4'-5 5/16'' -- 2'-8 1/4''
Adjacent Pitch 7:12 = 3'-9 11/16'' -- 3'-0 5/16''
Adjacent Pitch 8:12 = 3'-3 15/16'' -- 3'-3 15/16''
Adjacent Pitch 9:12 = 2'-11 9/16'' -- 3'-7 1/4''
Adjacent Pitch 10:12 = 2'-7 15/16'' -- 3'-10 1/8''
Adjacent Pitch 11:12 = 2'-5 1/16'' -- 4'-0 11/16''
Adjacent Pitch 12:12 = 2'-2 11/16'' -- 4'-2 15/16''
Adjacent Pitch 13:12 = 2'-0 5/8'' -- 4'-4 15/16''
Adjacent Pitch 14:12 = 1'-10 7/8'' -- 4'-6 11/16''
Adjacent Pitch 15:12 = 1'-9 5/16'' -- 4'-8 1/4''
Adjacent Pitch 16:12 = 1'-7 15/16'' -- 4'-9 5/8''

Main Pitch 9:12
Adjacent Pitch 1:12 = 28'-9 5/8'' -- 0'-5 3/8''
Adjacent Pitch 2:12 = 14'-4 13/16'' -- 0'-10 9/16''
Adjacent Pitch 3:12 = 9'-7 1/4'' -- 1'-3 9/16''
Adjacent Pitch 4:12 = 7'-2 7/16'' -- 1'-8 1/4''
Adjacent Pitch 5:12 = 5'-9 1/8'' -- 2'-0 5/8''
Adjacent Pitch 6:12 = 4'-9 5/8'' -- 2'-4 5/8''
Adjacent Pitch 7:12 = 4'-1 3/8'' -- 2'-8 1/4''
Adjacent Pitch 8:12 = 3'-7 1/4'' -- 2'-11 9/16''
Adjacent Pitch 9:12 = 3'-2 7/16'' -- 3'-2 7/16''
Adjacent Pitch 10:12 = 2'-10 9/16'' -- 3'-4 15/16''
Adjacent Pitch 11:12 = 2'-7 7/16'' -- 3'-7 1/4''
Adjacent Pitch 12:12 = 2'-4 13/16'' -- 3'-9 5/16''
Adjacent Pitch 13:12 = 2'-2 5/8'' -- 3'-11 1/16''
Adjacent Pitch 14:12 = 2'-0 11/16'' -- 4'-0 5/8''
Adjacent Pitch 15:12 = 1'-11 1/16'' -- 4'-1 15/16''
Adjacent Pitch 16:12 = 1'-9 5/8'' -- 4'-3 1/4''

Main Pitch 10:12
Adjacent Pitch 1:12 = 30'-8 3/4'' -- 0'-4 13/16''
Adjacent Pitch 2:12 = 15'-4 3/8'' -- 0'-9 1/2''
Adjacent Pitch 3:12 = 10'-2 15/16'' -- 1'-1 15/16''
Adjacent Pitch 4:12 = 7'-8 3/16'' -- 1'-6 1/4''
Adjacent Pitch 5:12 = 6'-1 3/4'' -- 1'-10 3/16''
Adjacent Pitch 6:12 = 5'-1 1/2'' -- 2'-1 13/16''
Adjacent Pitch 7:12 = 4'-4 11/16'' -- 2'-5 1/16''
Adjacent Pitch 8:12 = 3'-10 1/8'' -- 2'-7 15/16''
Adjacent Pitch 9:12 = 3'-4 15/16'' -- 2'-10 9/16''
Adjacent Pitch 10:12 = 3'-0 7/8'' -- 3'-0 7/8''
Adjacent Pitch 11:12 = 2'-9 9/16'' -- 3'-2 15/16''
Adjacent Pitch 12:12 = 2'-6 3/4'' -- 3'-4 3/4''
Adjacent Pitch 13:12 = 2'-4 3/8'' -- 3'-6 3/8''
Adjacent Pitch 14:12 = 2'-2 3/8'' -- 3'-7 3/4''
Adjacent Pitch 15:12 = 2'-0 5/8'' -- 3'-9''
Adjacent Pitch 16:12 = 1'-11 1/16'' -- 3'-10 1/8''

Main Pitch 11:12
Adjacent Pitch 1:12 = 32'-5 1/4'' -- 0'-4 3/8''
Adjacent Pitch 2:12 = 16'-2 5/8'' -- 0'-8 5/8''
Adjacent Pitch 3:12 = 10'-9 3/4'' -- 1'-0 3/4''
Adjacent Pitch 4:12 = 8'-1 5/16'' -- 1'-4 9/16''
Adjacent Pitch 5:12 = 6'-5 7/8'' -- 1'-8 3/16''
Adjacent Pitch 6:12 = 5'-4 7/8'' -- 1'-11 7/16''
Adjacent Pitch 7:12 = 4'-7 5/8'' -- 2'-2 7/16''
Adjacent Pitch 8:12 = 4'-0 11/16'' -- 2'-5 1/16''
Adjacent Pitch 9:12 = 3'-7 1/4'' -- 2'-7 7/16''
Adjacent Pitch 10:12 = 3'-2 15/16'' -- 2'-9 9/16''
Adjacent Pitch 11:12 = 2'-11 7/16'' -- 2'-11 7/16''
Adjacent Pitch 12:12 = 2'-8 7/16'' -- 3'-1 1/16''
Adjacent Pitch 13:12 = 2'-5 15/16'' -- 3'-2 1/2''
Adjacent Pitch 14:12 = 2'-3 13/16'' -- 3'-3 13/16''
Adjacent Pitch 15:12 = 2'-1 15/16'' -- 3'-4 15/16''
Adjacent Pitch 16:12 = 2'-0 3/8'' -- 3'-5 15/16''

Main Pitch 12:12
Adjacent Pitch 1:12 = 33'-11 5/16'' -- 0'-4''
Adjacent Pitch 2:12 = 16'-11 11/16'' -- 0'-7 15/16''
Adjacent Pitch 3:12 = 11'-3 13/16'' -- 0'-11 11/16''
Adjacent Pitch 4:12 = 8'-5 7/8'' -- 1'-3 3/16''
Adjacent Pitch 5:12 = 6'-9 1/2'' -- 1'-6 1/2''
Adjacent Pitch 6:12 = 5'-7 15/16'' -- 1'-9 1/2''
Adjacent Pitch 7:12 = 4'-10 3/16'' -- 2'-0 3/16''
Adjacent Pitch 8:12 = 4'-2 15/16'' -- 2'-2 11/16''
Adjacent Pitch 9:12 = 3'-9 5/16'' -- 2'-4 13/16''
Adjacent Pitch 10:12 = 3'-4 3/4'' -- 2'-6 3/4''
Adjacent Pitch 11:12 = 3'-1 1/16'' -- 2'-8 7/16''
Adjacent Pitch 12:12 = 2'-9 15/16'' -- 2'-9 15/16''
Adjacent Pitch 13:12 = 2'-7 3/8'' -- 2'-11 5/16''
Adjacent Pitch 14:12 = 2'-5 1/8'' -- 3'-0 1/2''
Adjacent Pitch 15:12 = 2'-3 3/16'' -- 3'-1 1/2''
Adjacent Pitch 16:12 = 2'-1 1/2'' -- 3'-2 7/16''

Main Pitch 13:12
Adjacent Pitch 1:12 = 35'-3 1/4'' -- 0'-3 11/16''
Adjacent Pitch 2:12 = 17'-7 5/8'' -- 0'-7 5/16''
Adjacent Pitch 3:12 = 11'-9 1/8'' -- 0'-10 3/4''
Adjacent Pitch 4:12 = 8'-9 13/16'' -- 1'-2 1/16''
Adjacent Pitch 5:12 = 7'-0 11/16'' -- 1'-5 1/16''
Adjacent Pitch 6:12 = 5'-10 9/16'' -- 1'-7 7/8''
Adjacent Pitch 7:12 = 5'-0 1/2'' -- 1'-10 3/8''
Adjacent Pitch 8:12 = 4'-4 15/16'' -- 2'-0 5/8''
Adjacent Pitch 9:12 = 3'-11 1/16'' -- 2'-2 5/8''
Adjacent Pitch 10:12 = 3'-6 3/8'' -- 2'-4 3/8''
Adjacent Pitch 11:12 = 3'-2 1/2'' -- 2'-5 15/16''
Adjacent Pitch 12:12 = 2'-11 5/16'' -- 2'-7 3/8''
Adjacent Pitch 13:12 = 2'-8 9/16'' -- 2'-8 9/16''
Adjacent Pitch 14:12 = 2'-6 1/4'' -- 2'-9 11/16''
Adjacent Pitch 15:12 = 2'-4 1/4'' -- 2'-10 5/8''
Adjacent Pitch 16:12 = 2'-2 1/2'' -- 2'-11 1/2''

Main Pitch 14:12
Adjacent Pitch 1:12 = 36'-5 3/8'' -- 0'-3 7/16''
Adjacent Pitch 2:12 = 18'-2 11/16'' -- 0'-6 13/16''
Adjacent Pitch 3:12 = 12'-1 13/16'' -- 0'-10''
Adjacent Pitch 4:12 = 9'-1 3/8'' -- 1'-1 1/16''
Adjacent Pitch 5:12 = 7'-3 1/2'' -- 1'-3 7/8''
Adjacent Pitch 6:12 = 6'-0 15/16'' -- 1'-6 7/16''
Adjacent Pitch 7:12 = 5'-2 1/2'' -- 1'-8 3/4''
Adjacent Pitch 8:12 = 4'-6 11/16'' -- 1'-10 7/8''
Adjacent Pitch 9:12 = 4'-0 5/8'' -- 2'-0 11/16''
Adjacent Pitch 10:12 = 3'-7 3/4'' -- 2'-2 3/8''
Adjacent Pitch 11:12 = 3'-3 13/16'' -- 2'-3 13/16''
Adjacent Pitch 12:12 = 3'-0 1/2'' -- 2'-5 1/8''
Adjacent Pitch 13:12 = 2'-9 11/16'' -- 2'-6 1/4''
Adjacent Pitch 14:12 = 2'-7 1/4'' -- 2'-7 1/4''
Adjacent Pitch 15:12 = 2'-5 3/16'' -- 2'-8 3/16''
Adjacent Pitch 16:12 = 2'-3 3/8'' -- 2'-8 15/16''

Main Pitch 15:12
Adjacent Pitch 1:12 = 37'-5 13/16'' -- 0'-3 1/4''
Adjacent Pitch 2:12 = 18'-8 15/16'' -- 0'-6 3/8''
Adjacent Pitch 3:12 = 12'-5 15/16'' -- 0'-9 3/8''
Adjacent Pitch 4:12 = 9'-4 1/2'' -- 1'-0 3/16''
Adjacent Pitch 5:12 = 7'-5 15/16'' -- 1'-2 13/16''
Adjacent Pitch 6:12 = 6'-2 15/16'' -- 1'-5 3/16''
Adjacent Pitch 7:12 = 5'-4 5/16'' -- 1'-7 3/8''
Adjacent Pitch 8:12 = 4'-8 1/4'' -- 1'-9 5/16''
Adjacent Pitch 9:12 = 4'-1 15/16'' -- 1'-11 1/16''
Adjacent Pitch 10:12 = 3'-9'' -- 2'-0 5/8''
Adjacent Pitch 11:12 = 3'-4 15/16'' -- 2'-1 15/16''
Adjacent Pitch 12:12 = 3'-1 1/2'' -- 2'-3 3/16''
Adjacent Pitch 13:12 = 2'-10 5/8'' -- 2'-4 1/4''
Adjacent Pitch 14:12 = 2'-8 3/16'' -- 2'-5 3/16''
Adjacent Pitch 15:12 = 2'-6'' -- 2'-6''
Adjacent Pitch 16:12 = 2'-4 1/8'' -- 2'-6 3/4''

Main Pitch 16:12
Adjacent Pitch 1:12 = 38'-4 13/16'' -- 0'-3''
Adjacent Pitch 2:12 = 19'-2 7/16'' -- 0'-5 15/16''
Adjacent Pitch 3:12 = 12'-9 5/8'' -- 0'-8 3/4''
Adjacent Pitch 4:12 = 9'-7 1/4'' -- 0'-11 7/16''
Adjacent Pitch 5:12 = 7'-8 3/16'' -- 1'-1 7/8''
Adjacent Pitch 6:12 = 6'-4 13/16'' -- 1'-4 1/8''
Adjacent Pitch 7:12 = 5'-5 7/8'' -- 1'-6 3/16''
Adjacent Pitch 8:12 = 4'-9 5/8'' -- 1'-7 15/16''
Adjacent Pitch 9:12 = 4'-3 1/4'' -- 1'-9 5/8''
Adjacent Pitch 10:12 = 3'-10 1/8'' -- 1'-11 1/16''
Adjacent Pitch 11:12 = 3'-5 15/16'' -- 2'-0 3/8''
Adjacent Pitch 12:12 = 3'-2 7/16'' -- 2'-1 1/2''
Adjacent Pitch 13:12 = 2'-11 1/2'' -- 2'-2 1/2''
Adjacent Pitch 14:12 = 2'-8 15/16'' -- 2'-3 3/8''
Adjacent Pitch 15:12 = 2'-6 3/4'' -- 2'-4 1/8''
Adjacent Pitch 16:12 = 2'-4 13/16'' -- 2'-4 13/16''

Roof Sheathing Plywood Diagonal for Irregular Roof Pitches
Main Plywood Diagonal -- Adjacent Plywood Diagonal

Main Pitch 1:12
Adjacent Pitch 1:12 = 5'-7 13/16'' -- 5'-7 13/16''
Adjacent Pitch 2:12 = 4'-5 11/16'' -- 8'-10 3/16''
Adjacent Pitch 3:12 = 4'-2 5/8'' -- 12'-3 3/4''
Adjacent Pitch 4:12 = 4'-1 1/2'' -- 15'-8 3/8''
Adjacent Pitch 5:12 = 4'-0 15/16'' -- 18'-10 11/16''
Adjacent Pitch 6:12 = 4'-0 11/16'' -- 21'-10 1/16''
Adjacent Pitch 7:12 = 4'-0 1/2'' -- 24'-6 3/16''
Adjacent Pitch 8:12 = 4'-0 3/8'' -- 26'-11 1/8''
Adjacent Pitch 9:12 = 4'-0 5/16'' -- 29'-0 15/16''
Adjacent Pitch 10:12 = 4'-0 1/4'' -- 30'-11 7/8''
Adjacent Pitch 11:12 = 4'-0 1/4'' -- 32'-8 3/16''
Adjacent Pitch 12:12 = 4'-0 3/16'' -- 34'-2 1/8''
Adjacent Pitch 13:12 = 4'-0 3/16'' -- 35'-5 15/16''
Adjacent Pitch 14:12 = 4'-0 1/8'' -- 36'-7 15/16''
Adjacent Pitch 15:12 = 4'-0 1/8'' -- 37'-8 3/8''
Adjacent Pitch 16:12 = 4'-0 1/8'' -- 38'-7 5/16''

Main Pitch 2:12
Adjacent Pitch 1:12 = 8'-10 3/16'' -- 4'-5 11/16''
Adjacent Pitch 2:12 = 5'-7 7/16'' -- 5'-7 7/16''
Adjacent Pitch 3:12 = 4'-9 1/2'' -- 7'-0 13/16''
Adjacent Pitch 4:12 = 4'-5 9/16'' -- 8'-6 15/16''
Adjacent Pitch 5:12 = 4'-3 5/8'' -- 10'-0 3/4''
Adjacent Pitch 6:12 = 4'-2 9/16'' -- 11'-5 1/2''
Adjacent Pitch 7:12 = 4'-1 7/8'' -- 12'-8 7/8''
Adjacent Pitch 8:12 = 4'-1 1/2'' -- 13'-10 13/16''
Adjacent Pitch 9:12 = 4'-1 3/16'' -- 14'-11 3/8''
Adjacent Pitch 10:12 = 4'-0 15/16'' -- 15'-10 9/16''
Adjacent Pitch 11:12 = 4'-0 13/16'' -- 16'-8 1/2''
Adjacent Pitch 12:12 = 4'-0 11/16'' -- 17'-5 1/4''
Adjacent Pitch 13:12 = 4'-0 9/16'' -- 18'-1''
Adjacent Pitch 14:12 = 4'-0 1/2'' -- 18'-7 7/8''
Adjacent Pitch 15:12 = 4'-0 7/16'' -- 19'-1 15/16''
Adjacent Pitch 16:12 = 4'-0 3/8'' -- 19'-7 3/8''

Main Pitch 3:12
Adjacent Pitch 1:12 = 12'-3 3/4'' -- 4'-2 5/8''
Adjacent Pitch 2:12 = 7'-0 13/16'' -- 4'-9 1/2''
Adjacent Pitch 3:12 = 5'-6 15/16'' -- 5'-6 15/16''
Adjacent Pitch 4:12 = 4'-11 3/8'' -- 6'-5 7/16''
Adjacent Pitch 5:12 = 4'-7 9/16'' -- 7'-4 1/8''
Adjacent Pitch 6:12 = 4'-5 3/8'' -- 8'-2 3/8''
Adjacent Pitch 7:12 = 4'-4'' -- 9'-0''
Adjacent Pitch 8:12 = 4'-3 1/8'' -- 9'-8 7/8''
Adjacent Pitch 9:12 = 4'-2 1/2'' -- 10'-4 13/16''
Adjacent Pitch 10:12 = 4'-2'' -- 10'-11 15/16''
Adjacent Pitch 11:12 = 4'-1 11/16'' -- 11'-6 3/8''
Adjacent Pitch 12:12 = 4'-1 7/16'' -- 12'-0''
Adjacent Pitch 13:12 = 4'-1 1/4'' -- 12'-5 1/16''
Adjacent Pitch 14:12 = 4'-1 1/16'' -- 12'-9 1/2''
Adjacent Pitch 15:12 = 4'-0 15/16'' -- 13'-1 7/16''
Adjacent Pitch 16:12 = 4'-0 13/16'' -- 13'-4 15/16''

Main Pitch 4:12
Adjacent Pitch 1:12 = 15'-8 3/8'' -- 4'-1 1/2''
Adjacent Pitch 2:12 = 8'-6 15/16'' -- 4'-5 9/16''
Adjacent Pitch 3:12 = 6'-5 7/16'' -- 4'-11 3/8''
Adjacent Pitch 4:12 = 5'-6 3/16'' -- 5'-6 3/16''
Adjacent Pitch 5:12 = 5'-0 5/16'' -- 6'-1 5/16''
Adjacent Pitch 6:12 = 4'-8 13/16'' -- 6'-8 3/8''
Adjacent Pitch 7:12 = 4'-6 5/8'' -- 7'-3''
Adjacent Pitch 8:12 = 4'-5 3/16'' -- 7'-9 1/4''
Adjacent Pitch 9:12 = 4'-4 1/8'' -- 8'-2 7/8''
Adjacent Pitch 10:12 = 4'-3 3/8'' -- 8'-7 15/16''
Adjacent Pitch 11:12 = 4'-2 13/16'' -- 9'-0 1/2''
Adjacent Pitch 12:12 = 4'-2 3/8'' -- 9'-4 5/8''
Adjacent Pitch 13:12 = 4'-2 1/16'' -- 9'-8 1/4''
Adjacent Pitch 14:12 = 4'-1 3/4'' -- 9'-11 7/16''
Adjacent Pitch 15:12 = 4'-1 9/16'' -- 10'-2 5/16''
Adjacent Pitch 16:12 = 4'-1 3/8'' -- 10'-4 13/16''

Main Pitch 5:12
Adjacent Pitch 1:12 = 18'-10 11/16'' -- 4'-0 15/16''
Adjacent Pitch 2:12 = 10'-0 3/4'' -- 4'-3 5/8''
Adjacent Pitch 3:12 = 7'-4 1/8'' -- 4'-7 9/16''
Adjacent Pitch 4:12 = 6'-1 5/16'' -- 5'-0 5/16''
Adjacent Pitch 5:12 = 5'-5 3/8'' -- 5'-5 3/8''
Adjacent Pitch 6:12 = 5'-0 9/16'' -- 5'-10 7/16''
Adjacent Pitch 7:12 = 4'-9 1/2'' -- 6'-3 3/8''
Adjacent Pitch 8:12 = 4'-7 7/16'' -- 6'-7 15/16''
Adjacent Pitch 9:12 = 4'-5 15/16'' -- 7'-0 3/16''
Adjacent Pitch 10:12 = 4'-4 7/8'' -- 7'-4''
Adjacent Pitch 11:12 = 4'-4 1/16'' -- 7'-7 1/2''
Adjacent Pitch 12:12 = 4'-3 7/16'' -- 7'-10 9/16''
Adjacent Pitch 13:12 = 4'-2 15/16'' -- 8'-1 5/16''
Adjacent Pitch 14:12 = 4'-2 9/16'' -- 8'-3 13/16''
Adjacent Pitch 15:12 = 4'-2 1/4'' -- 8'-5 15/16''
Adjacent Pitch 16:12 = 4'-1 15/16'' -- 8'-7 15/16''

Main Pitch 6:12
Adjacent Pitch 1:12 = 21'-10 1/16'' -- 4'-0 11/16''
Adjacent Pitch 2:12 = 11'-5 1/2'' -- 4'-2 9/16''
Adjacent Pitch 3:12 = 8'-2 3/8'' -- 4'-5 3/8''
Adjacent Pitch 4:12 = 6'-8 3/8'' -- 4'-8 13/16''
Adjacent Pitch 5:12 = 5'-10 7/16'' -- 5'-0 9/16''
Adjacent Pitch 6:12 = 5'-4 7/16'' -- 5'-4 7/16''
Adjacent Pitch 7:12 = 5'-0 1/2'' -- 5'-8 3/16''
Adjacent Pitch 8:12 = 4'-9 13/16'' -- 5'-11 3/4''
Adjacent Pitch 9:12 = 4'-7 15/16'' -- 6'-3''
Adjacent Pitch 10:12 = 4'-6 1/2'' -- 6'-6''
Adjacent Pitch 11:12 = 4'-5 7/16'' -- 6'-8 3/4''
Adjacent Pitch 12:12 = 4'-4 5/8'' -- 6'-11 3/16''
Adjacent Pitch 13:12 = 4'-3 15/16'' -- 7'-1 3/8''
Adjacent Pitch 14:12 = 4'-3 7/16'' -- 7'-3 5/16''
Adjacent Pitch 15:12 = 4'-3'' -- 7'-5 1/16''
Adjacent Pitch 16:12 = 4'-2 11/16'' -- 7'-6 5/8''

Main Pitch 7:12
Adjacent Pitch 1:12 = 24'-6 3/16'' -- 4'-0 1/2''
Adjacent Pitch 2:12 = 12'-8 7/8'' -- 4'-1 7/8''
Adjacent Pitch 3:12 = 9'-0'' -- 4'-4''
Adjacent Pitch 4:12 = 7'-3'' -- 4'-6 5/8''
Adjacent Pitch 5:12 = 6'-3 3/8'' -- 4'-9 1/2''
Adjacent Pitch 6:12 = 5'-8 3/16'' -- 5'-0 1/2''
Adjacent Pitch 7:12 = 5'-3 7/16'' -- 5'-3 7/16''
Adjacent Pitch 8:12 = 5'-0 3/16'' -- 5'-6 1/4''
Adjacent Pitch 9:12 = 4'-9 7/8'' -- 5'-8 7/8''
Adjacent Pitch 10:12 = 4'-8 1/8'' -- 5'-11 5/16''
Adjacent Pitch 11:12 = 4'-6 13/16'' -- 6'-1 1/2''
Adjacent Pitch 12:12 = 4'-5 3/4'' -- 6'-3 7/16''
Adjacent Pitch 13:12 = 4'-4 15/16'' -- 6'-5 1/4''
Adjacent Pitch 14:12 = 4'-4 5/16'' -- 6'-6 13/16''
Adjacent Pitch 15:12 = 4'-3 13/16'' -- 6'-8 1/4''
Adjacent Pitch 16:12 = 4'-3 3/8'' -- 6'-9 1/2''

Main Pitch 8:12
Adjacent Pitch 1:12 = 26'-11 1/8'' -- 4'-0 3/8''
Adjacent Pitch 2:12 = 13'-10 13/16'' -- 4'-1 1/2''
Adjacent Pitch 3:12 = 9'-8 7/8'' -- 4'-3 1/8''
Adjacent Pitch 4:12 = 7'-9 1/4'' -- 4'-5 3/16''
Adjacent Pitch 5:12 = 6'-7 15/16'' -- 4'-7 7/16''
Adjacent Pitch 6:12 = 5'-11 3/4'' -- 4'-9 13/16''
Adjacent Pitch 7:12 = 5'-6 1/4'' -- 5'-0 3/16''
Adjacent Pitch 8:12 = 5'-2 1/2'' -- 5'-2 1/2''
Adjacent Pitch 9:12 = 4'-11 3/4'' -- 5'-4 5/8''
Adjacent Pitch 10:12 = 4'-9 11/16'' -- 5'-6 9/16''
Adjacent Pitch 11:12 = 4'-8 1/8'' -- 5'-8 3/8''
Adjacent Pitch 12:12 = 4'-6 15/16'' -- 5'-9 15/16''
Adjacent Pitch 13:12 = 4'-5 15/16'' -- 5'-11 7/16''
Adjacent Pitch 14:12 = 4'-5 3/16'' -- 6'-0 3/4''
Adjacent Pitch 15:12 = 4'-4 9/16'' -- 6'-1 15/16''
Adjacent Pitch 16:12 = 4'-4'' -- 6'-3''

Main Pitch 9:12
Adjacent Pitch 1:12 = 29'-0 15/16'' -- 4'-0 5/16''
Adjacent Pitch 2:12 = 14'-11 3/8'' -- 4'-1 3/16''
Adjacent Pitch 3:12 = 10'-4 13/16'' -- 4'-2 1/2''
Adjacent Pitch 4:12 = 8'-2 7/8'' -- 4'-4 1/8''
Adjacent Pitch 5:12 = 7'-0 3/16'' -- 4'-5 15/16''
Adjacent Pitch 6:12 = 6'-3'' -- 4'-7 15/16''
Adjacent Pitch 7:12 = 5'-8 7/8'' -- 4'-9 7/8''
Adjacent Pitch 8:12 = 5'-4 5/8'' -- 4'-11 3/4''
Adjacent Pitch 9:12 = 5'-1 1/2'' -- 5'-1 1/2''
Adjacent Pitch 10:12 = 4'-11 3/16'' -- 5'-3 1/8''
Adjacent Pitch 11:12 = 4'-9 3/8'' -- 5'-4 5/8''
Adjacent Pitch 12:12 = 4'-7 15/16'' -- 5'-5 15/16''
Adjacent Pitch 13:12 = 4'-6 7/8'' -- 5'-7 1/4''
Adjacent Pitch 14:12 = 4'-5 15/16'' -- 5'-8 5/16''
Adjacent Pitch 15:12 = 4'-5 1/4'' -- 5'-9 5/16''
Adjacent Pitch 16:12 = 4'-4 11/16'' -- 5'-10 3/16''

Main Pitch 10:12
Adjacent Pitch 1:12 = 30'-11 7/8'' -- 4'-0 1/4''
Adjacent Pitch 2:12 = 15'-10 9/16'' -- 4'-0 15/16''
Adjacent Pitch 3:12 = 10'-11 15/16'' -- 4'-2''
Adjacent Pitch 4:12 = 8'-7 15/16'' -- 4'-3 3/8''
Adjacent Pitch 5:12 = 7'-4'' -- 4'-4 7/8''
Adjacent Pitch 6:12 = 6'-6'' -- 4'-6 1/2''
Adjacent Pitch 7:12 = 5'-11 5/16'' -- 4'-8 1/8''
Adjacent Pitch 8:12 = 5'-6 9/16'' -- 4'-9 11/16''
Adjacent Pitch 9:12 = 5'-3 1/8'' -- 4'-11 3/16''
Adjacent Pitch 10:12 = 5'-0 9/16'' -- 5'-0 9/16''
Adjacent Pitch 11:12 = 4'-10 9/16'' -- 5'-1 13/16''
Adjacent Pitch 12:12 = 4'-9'' -- 5'-2 15/16''
Adjacent Pitch 13:12 = 4'-7 13/16'' -- 5'-4''
Adjacent Pitch 14:12 = 4'-6 13/16'' -- 5'-4 15/16''
Adjacent Pitch 15:12 = 4'-5 15/16'' -- 5'-5 13/16''
Adjacent Pitch 16:12 = 4'-5 1/4'' -- 5'-6 9/16''

Main Pitch 11:12
Adjacent Pitch 1:12 = 32'-8 3/16'' -- 4'-0 1/4''
Adjacent Pitch 2:12 = 16'-8 1/2'' -- 4'-0 13/16''
Adjacent Pitch 3:12 = 11'-6 3/8'' -- 4'-1 11/16''
Adjacent Pitch 4:12 = 9'-0 1/2'' -- 4'-2 13/16''
Adjacent Pitch 5:12 = 7'-7 1/2'' -- 4'-4 1/16''
Adjacent Pitch 6:12 = 6'-8 3/4'' -- 4'-5 7/16''
Adjacent Pitch 7:12 = 6'-1 1/2'' -- 4'-6 13/16''
Adjacent Pitch 8:12 = 5'-8 3/8'' -- 4'-8 1/8''
Adjacent Pitch 9:12 = 5'-4 5/8'' -- 4'-9 3/8''
Adjacent Pitch 10:12 = 5'-1 13/16'' -- 4'-10 9/16''
Adjacent Pitch 11:12 = 4'-11 11/16'' -- 4'-11 11/16''
Adjacent Pitch 12:12 = 4'-9 15/16'' -- 5'-0 5/8''
Adjacent Pitch 13:12 = 4'-8 5/8'' -- 5'-1 9/16''
Adjacent Pitch 14:12 = 4'-7 1/2'' -- 5'-2 3/8''
Adjacent Pitch 15:12 = 4'-6 5/8'' -- 5'-3 1/16''
Adjacent Pitch 16:12 = 4'-5 13/16'' -- 5'-3 3/4''

Main Pitch 12:12
Adjacent Pitch 1:12 = 34'-2 1/8'' -- 4'-0 3/16''
Adjacent Pitch 2:12 = 17'-5 1/4'' -- 4'-0 11/16''
Adjacent Pitch 3:12 = 12'-0'' -- 4'-1 7/16''
Adjacent Pitch 4:12 = 9'-4 5/8'' -- 4'-2 3/8''
Adjacent Pitch 5:12 = 7'-10 9/16'' -- 4'-3 7/16''
Adjacent Pitch 6:12 = 6'-11 3/16'' -- 4'-4 5/8''
Adjacent Pitch 7:12 = 6'-3 7/16'' -- 4'-5 3/4''
Adjacent Pitch 8:12 = 5'-9 15/16'' -- 4'-6 15/16''
Adjacent Pitch 9:12 = 5'-5 15/16'' -- 4'-7 15/16''
Adjacent Pitch 10:12 = 5'-2 15/16'' -- 4'-9''
Adjacent Pitch 11:12 = 5'-0 5/8'' -- 4'-9 15/16''
Adjacent Pitch 12:12 = 4'-10 13/16'' -- 4'-10 13/16''
Adjacent Pitch 13:12 = 4'-9 3/8'' -- 4'-11 5/8''
Adjacent Pitch 14:12 = 4'-8 3/16'' -- 5'-0 5/16''
Adjacent Pitch 15:12 = 4'-7 3/16'' -- 5'-0 15/16''
Adjacent Pitch 16:12 = 4'-6 3/8'' -- 5'-1 1/2''

Main Pitch 13:12
Adjacent Pitch 1:12 = 35'-5 15/16'' -- 4'-0 3/16''
Adjacent Pitch 2:12 = 18'-1'' -- 4'-0 9/16''
Adjacent Pitch 3:12 = 12'-5 1/16'' -- 4'-1 1/4''
Adjacent Pitch 4:12 = 9'-8 1/4'' -- 4'-2 1/16''
Adjacent Pitch 5:12 = 8'-1 5/16'' -- 4'-2 15/16''
Adjacent Pitch 6:12 = 7'-1 3/8'' -- 4'-3 15/16''
Adjacent Pitch 7:12 = 6'-5 1/4'' -- 4'-4 15/16''
Adjacent Pitch 8:12 = 5'-11 7/16'' -- 4'-5 15/16''
Adjacent Pitch 9:12 = 5'-7 1/4'' -- 4'-6 7/8''
Adjacent Pitch 10:12 = 5'-4'' -- 4'-7 13/16''
Adjacent Pitch 11:12 = 5'-1 9/16'' -- 4'-8 5/8''
Adjacent Pitch 12:12 = 4'-11 5/8'' -- 4'-9 3/8''
Adjacent Pitch 13:12 = 4'-10'' -- 4'-10''
Adjacent Pitch 14:12 = 4'-8 3/4'' -- 4'-10 5/8''
Adjacent Pitch 15:12 = 4'-7 11/16'' -- 4'-11 3/16''
Adjacent Pitch 16:12 = 4'-6 13/16'' -- 4'-11 11/16''

Main Pitch 14:12
Adjacent Pitch 1:12 = 36'-7 15/16'' -- 4'-0 1/8''
Adjacent Pitch 2:12 = 18'-7 7/8'' -- 4'-0 1/2''
Adjacent Pitch 3:12 = 12'-9 1/2'' -- 4'-1 1/16''
Adjacent Pitch 4:12 = 9'-11 7/16'' -- 4'-1 3/4''
Adjacent Pitch 5:12 = 8'-3 13/16'' -- 4'-2 9/16''
Adjacent Pitch 6:12 = 7'-3 5/16'' -- 4'-3 7/16''
Adjacent Pitch 7:12 = 6'-6 13/16'' -- 4'-4 5/16''
Adjacent Pitch 8:12 = 6'-0 3/4'' -- 4'-5 3/16''
Adjacent Pitch 9:12 = 5'-8 5/16'' -- 4'-5 15/16''
Adjacent Pitch 10:12 = 5'-4 15/16'' -- 4'-6 13/16''
Adjacent Pitch 11:12 = 5'-2 3/8'' -- 4'-7 1/2''
Adjacent Pitch 12:12 = 5'-0 5/16'' -- 4'-8 3/16''
Adjacent Pitch 13:12 = 4'-10 5/8'' -- 4'-8 3/4''
Adjacent Pitch 14:12 = 4'-9 5/16'' -- 4'-9 5/16''
Adjacent Pitch 15:12 = 4'-8 3/16'' -- 4'-9 13/16''
Adjacent Pitch 16:12 = 4'-7 1/4'' -- 4'-10 1/4''

Main Pitch 15:12
Adjacent Pitch 1:12 = 37'-8 3/8'' -- 4'-0 1/8''
Adjacent Pitch 2:12 = 19'-1 15/16'' -- 4'-0 7/16''
Adjacent Pitch 3:12 = 13'-1 7/16'' -- 4'-0 15/16''
Adjacent Pitch 4:12 = 10'-2 5/16'' -- 4'-1 9/16''
Adjacent Pitch 5:12 = 8'-5 15/16'' -- 4'-2 1/4''
Adjacent Pitch 6:12 = 7'-5 1/16'' -- 4'-3''
Adjacent Pitch 7:12 = 6'-8 1/4'' -- 4'-3 13/16''
Adjacent Pitch 8:12 = 6'-1 15/16'' -- 4'-4 9/16''
Adjacent Pitch 9:12 = 5'-9 5/16'' -- 4'-5 1/4''
Adjacent Pitch 10:12 = 5'-5 13/16'' -- 4'-5 15/16''
Adjacent Pitch 11:12 = 5'-3 1/16'' -- 4'-6 5/8''
Adjacent Pitch 12:12 = 5'-0 15/16'' -- 4'-7 3/16''
Adjacent Pitch 13:12 = 4'-11 3/16'' -- 4'-7 11/16''
Adjacent Pitch 14:12 = 4'-9 13/16'' -- 4'-8 3/16''
Adjacent Pitch 15:12 = 4'-8 5/8'' -- 4'-8 5/8''
Adjacent Pitch 16:12 = 4'-7 11/16'' -- 4'-9''

Main Pitch 16:12
Adjacent Pitch 1:12 = 38'-7 5/16'' -- 4'-0 1/8''
Adjacent Pitch 2:12 = 19'-7 3/8'' -- 4'-0 3/8''
Adjacent Pitch 3:12 = 13'-4 15/16'' -- 4'-0 13/16''
Adjacent Pitch 4:12 = 10'-4 13/16'' -- 4'-1 3/8''
Adjacent Pitch 5:12 = 8'-7 15/16'' -- 4'-1 15/16''
Adjacent Pitch 6:12 = 7'-6 5/8'' -- 4'-2 11/16''
Adjacent Pitch 7:12 = 6'-9 1/2'' -- 4'-3 3/8''
Adjacent Pitch 8:12 = 6'-3'' -- 4'-4''
Adjacent Pitch 9:12 = 5'-10 3/16'' -- 4'-4 11/16''
Adjacent Pitch 10:12 = 5'-6 9/16'' -- 4'-5 1/4''
Adjacent Pitch 11:12 = 5'-3 3/4'' -- 4'-5 13/16''
Adjacent Pitch 12:12 = 5'-1 1/2'' -- 4'-6 3/8''
Adjacent Pitch 13:12 = 4'-11 11/16'' -- 4'-6 13/16''
Adjacent Pitch 14:12 = 4'-10 1/4'' -- 4'-7 1/4''
Adjacent Pitch 15:12 = 4'-9'' -- 4'-7 11/16''
Adjacent Pitch 16:12 = 4'-7 15/16'' -- 4'-7 15/16''


Saturday, July 26, 2014

Knife Plate Slotter for Timber Framing


I originally had money in my bid to buy the Hema Chain Mortiser/Slot Cutter or Mafell Chain Mortiser/Slot Cutter for this timber framed, steel plate framed, barn in Portola Valley California. However, I had to lower may bid to get the job and I still needed a way of cutting the hidden 52 -- 3/8" x 8" deep steel knife plate slots in the timbers. I designed a slotter/mortise jig that I called the California Knife Plate Slotter - Mortiser for the 6x6 post and another jig that I called the Okie Knife Plate Slotter - Mortiser for the 5 1/2" x 9" GluLam Beams.

This is the first time I've assembled a roof structure without using any nails. Not even a nail to tack the exposed post or beams together. I had more problems with the bolt hole layout than making the knife plate slots.

Steel Knife Plates
Kerf Plates
Flitch Plates
Steel Plate Framing

California Knife Plate Slotter - Mortiser for the 6x6 post.
We slotted all of the 18-- 6x6 post in about 20 minutes with the California Knife Plate Slotter - Mortiser. However, we spent a lot more time on the countersink holes and thru bolt holes.






























The chainsaw bar is attached to the jig with 3 -- 2 1/2" SDS screws thru the 1 3/4" x 2 9/16" piece of poplar wood. Then the 1 3/4" x 2 9/16" poplar wood is attached to the sliding box, 5 1/2" x 5 1/2", with about 6 -- 2 1/2" torque head screws. The 5 1/2" x 5 1/2" box was built with 1 1/8" thick poplar and assembled with the 2 1/2" torque head screws.

Picture with the 4 3/4" tall piece of wood that we used to align the top of the chain with the box. This allowed us to make a slot in the timber that was close to perpendicular with the end of the 6x6 timber. We would slot the 6" x 6" post with the chainsaw and then flip the post over to even out the slot in the post.




We used a 7/16" bell reamer drill bit to clean up the sides and bottom of the 8" deep slot. The 16" long steel knife plate are not perfectly flat-straight. Some of the knife plates have a 1/16" bend in the plate from the laser cut heat. So most of the slots we made were tapered from 1/2" to 7/16" to make the 3/8" steel knife plates fit correctly. We use shims in the slots on some of the knife plates, there weren't a tight fit.








The California Knife Plate Slotter - Mortiser has a depth gauge block in the jig. The knife plates are 16" long with 8" of the knife plate attached to each of the timbers. We set the depth block for an 8 1/4" deep slot. The ends of the steel knife plates should not touch the timber. We used the same depth gauge block for the 5 1/2" x 9" GluLam beams.
The structural plans were drawn with square edged steel knife plates. I got the ok from the structural engineer to chamfer or radius cut the ends of the knife plates, because chainsaws always have a rounded nose. After going thru this process of cutting the slots in timbers for steel knife plates, I think all hidden steel knife plates such be designed with chamfered or radius cut ends.


Okie Knife Plate Slotter - Mortiser for the 5 1/2" x 9" GluLam Beams.
(AKA Chainsaw on a Stick)

Not a precision slotter, but it's better than free handing the 3/8"x 4"x 8" knife plate slots and it has a depth gauge block so we don't cut the slots too deep. This picture of the Okie Knife Plate Slotter - Mortiser is for the 5" deep slot we had to make in the sides of the 6x6 post and for the 5" deep slots we had to make in the ends of the GluLam beams.







Erik slides the chainsaw into the router slot and I press down on the Okie knife Plate Slotter jig to keep the chainsaw cut parallel with the sides of the GluLam beams.



                             The depth gauge block is also used to keep the jig perpendicular to the cut.




Timber Framing 101 router jigs. 

To slot the 5 1/2" x 9" Rosboro X-Beam, we used a router jig with a 1/2" straight flute bit. For slots on the ends of the GluLam beams we slotted the beams 4" deep with a 5 1/2" straight flute router bit, an 1" at a time on the depth so we didn't break the router bit. Most of the knife plates are 4" wide. Some were 6" wide on top of the steel columns and 7 1/2" wide on the sides of the columns where the end of the GluLam beams attached. We routed out a 4 1/4" wide slot for the 4" wide knife plates, since the knife plates have a square edge.








We drilled a couple of holes at each side of the slot with an 7/16" drill bit attached to our ProTool drill guide. To remove the wood the chainsaw didn't-couldn't remove. We would have had the same problem with the Hema or Mafell Chain Slotter with the radius nose on the slotter.









Router jig attached to the end of the GluLam beam.










Our newbie painting the ends of the GluLam beams with Anchor Sill to prevent the GluLam beams from checking or splitting in this 100+ degree heat.




Drilling out the steel post base hole an 1/32" . The steel columns  must be set perpendicular to the foundation layout to make the knife plates on top of the steel columns align with the knife plate slots in the GluLam beams.




Steel post and steel beams being welded.