Saturday, July 12, 2014

Two Hour Fire Wall

Tim Uhler and Kyle Davis layout, frame,sheathe and lift rake walls on a daily basis. They make it look as simple as tying your shoe laces. I had a two hour fire wall (1600 pounds) to lift this last week, so I asked Tim for the correct way to attach the lifting straps to the wall. I didn't want to jack up the wall and attach the lifting strap on the underside of the wall.

Sim,
We use nylon lifting straps we bought at whitecap.
Make sure they are rated 10,000# or greater.
On this last house we used Simpson screws because they are bigger then the Ledgerlok http://www.strongtie.com/products/connectors/SDWS-SDWH.asp?source=fastenhp
I would use 4 screws per pick point minimum. If the bottom plate on the way stays down, the pick points, and forklift will "see" less load as the wall goes up.

We've thought about making rips of 1.75" x 5" Lvl to use instead of 2x6 to screw to the top plates. We haven't had anything break yet. 

Tim
________________________________________________________

I went by WhiteCap Construction Supply on the way to work, but they didn't carry any of the Simpson Timber Screws. So I bought some GRK 3/8" x 8" timber screws that are rated at 4364 lbf  for side grain tear out. I was worried about the the top plate of our two hour fire wall ripping off the rake wall, because we only had two layers of GP DensGlass Sheathing (sheetrock). If I had structural plywood sheathing nailed to the rake wall top plates  I would not have been concerned about the top plates ripping off the studs.

Note: This two hour fire wall required 6 building inspection.

  1. Screw inspection on Base Layer on outside of wall.(1 1/4" min screw length, 6-12 O.C.)
  2. Screw inspection on Face Layer on outside of wall. (1 7/8" min screw length, 6-12 O.C.)
  3. Frame inspection after we lifted the wall.
  4. Shear wall sheathing nailing.
  5. Interior Screw inspection on Base Layer on inside of wall.(1 5/8" min screw length, 6-12 O.C.)
  6. Interior Screw inspection on Face Layer on inside of wall.(2 1/4" min screw length, 6-12 O.C.)


Outside base and face layer inspected.

3/8" x 8" GRK screws , 3 each side of rake wall top plates, screwed into our 4x4 post. With 4- 4 1/2" SDS screws on each side of the strap, that's rated at 12,800 pounds in the basket position.






Third inspection on the framing and anchor bolts.


Fourth inspection on the plywood shear wall nailing.

Fifth inspection on the base layer on the inside of the two hour fire wall.


Sixth inspection on the face layer of the two hour fire wall.


After using Tim's method of attaching the lifting straps to the top plates, I would only place the lifting straps on the bottom side of the two hour fires walls when they weigh more than 2,800 pounds.  Tim's method made lifting this rake wall as simple as tying our shoelaces.


Here's some pictures showing how we use to lift our walls, by jacking up the wall and placing the lifting straps on the bottom side of the wall. Or by cutting slots in the plywood for the lifting straps.








Saturday, June 28, 2014

Crown MoldingTools for iPhone

Some screen shots for Crown Molding Tools for iPhone-iPad.















Horizontal Crown Molding 2 Piece Corner.
        Calculate Crown Moulding Miter Angle & Saw Blade Bevel Angles for horizontal crown moulding at wall-ceiling corners.

Horizontal to Rake with Corner Transition Piece.
                 "Calculate Horizontal to Rake Crown Moulding Miter Angle & Saw Blade Bevel Angles with a Transition piece at the wall corner.


Rake to Horizontal Standard.
                 Calculate Rake to Horizontal Crown Moulding Miter Angle & Saw Blade Bevel Angles.


Rake to Rake Standard.
                Calculate Rake to Rake Crown Moulding Miter Angle & Saw Blade Bevel Angles on Gable End Roofs or Sloped Ceilings.


Radius Bullnose Crown Moulding.
                 Calculate Crown Moulding for Radius Bullnose Corners.


Polygon Crown Moulding.
                 Calculate Crown Moulding for Polygons.



Horizontal To Rake.
                 Calculate Horizontal to Rake Wall Crown Moulding with No Transitions pieces.


Rake To Horizontal at Corner Wall.
                 Calculate Rake to Horizontal Crown Moulding at wall corners with No Transitions pieces.


Rake To Rake.
                Calculate Rake Wall Crown Moulding to Rake Wall Crown Moulding with No Transitions pieces.

Rake To Level.
                 Calculate Rake Wall Crown Moulding to Level Crown Moulding with No Transitions pieces.



Rake To Level Return.
                 Calculate Rake Wall Crown Moulding to Level Return Crown Moulding with No Transitions pieces.


Rake To Rake At Peak
                 Calculate Rake Wall Crown Moulding to Rake WAll Crown Moulding at Peak of Roof with No Transitions pieces.


Exterior Rake Crown Moulding.
                 Calculate Exterior Rake Crown using 2 or 3 different crown profiles.


Crown Spring Angle.
                 Calculate Crown Moulding Spring Angle.

Material On Edge.
                 Calculate the Miter Angle & Saw Blade Bevel Angle for cutting Material On Edge in a Compound Miter Saw for compound joinery or crown moulding.



Email sent with the iPhone for
Exterior Rake Moulding with 3 Crown Moulding Profiles
Crown Molding Tools
Exterior Rake Crown using 2 or 3 different crown profiles 

Crown Moulding Spring Angle 38.00000° 
Roof Slope Angle 30.00000° 
Crown BackSide Width
2.79110

Crown Moulding Laying Flat with Top Edge of Moulding  Against Fence

Face A Joint #1
Miter Angle 1
31.61901°
Saw Blade Bevel Angle 1
33.86291°

Face B Joint #1
Miter Angle 2
6.80631°
Saw Blade Bevel Angle 2
51.92308°

Face B Joint #2
Miter Angle 3
47.72592°
Saw Blade Bevel Angle 3
24.44620°

Face C Joint #2
Miter Angle 4
20.80367°
Saw Blade Bevel Angle 4
40.85010°

Face C Joint #3
Miter Angle 5
20.80367°
Saw Blade Bevel Angle 5
40.85010°

Face B Joint #3
Miter Angle 6
47.72592°
Saw Blade Bevel Angle 6
24.44620°

Face B Roof Peak
Miter Angle 7
26.11942°
Saw Blade Bevel Angle 7
15.30723°


Cutting Crown Moulding Nested
Nested Miter Angle #1
45.00000°
Nested Bevel Angle #1
0.00000°

Nested Miter Angle #2
30.00000°
Nested Bevel Angle #2
45.00000°

Nested Miter Angle #3
30.00000°
Nested Bevel Angle #2
45.00000°

Nested Miter Angle #4
45.00000°
Nested Bevel Angle #2
0.00000°

Nested Miter Angle #7
30.00000°
Nested Bevel Angle #2
0.00000°

Face A Crown Slope Reference Plane
52.00000°

Face B Crown Slope Reference Plane
58.13029°

Face C Crown Slope Reference Plane
67.67018°

Backside Width Face A
2.79110

Backside Width Face B
3.25456

Backside Width Face C
4.52278

Level Projection for all Faces (Run)
1.71837

Face A Rise
2.19942

Face B Rise
2.76394

Face C Rise
4.18362
  

Sent from my iPhone

Email sent with the iPhone for
Horizontal to Rake with Corner Transition Piece
Crown Molding Tools
Horizontal to Rake with Corner Transition Piece
Crown Moulding Spring Angle
38.00000°
Wall Corner Angle
135.00000°
Roof Slope Angle
30.00000°

Crown Moulding Laying Flat with Top Edge of Moulding  Against Fence

Face A
Crown Moulding Miter Angle
14.30638°

Crown Moulding Bevel Angle
17.55124°


Face B Joint #1
Crown Moulding Miter Angle
14.30638°

Crown Moulding Bevel Angle
17.55124°


Face B Joint #2
Crown Moulding Miter Angle
8.79150°

Crown Moulding Bevel Angle
6.80951°


Face C Joint #2
Crown Moulding Miter Angle
8.79150°

Crown Moulding Bevel Angle
6.80951°


Cutting Crown Moulding Nested at Joint #2
Nested Miter Angle
11.10383°
Nested Bevel Angle
0.00000°


Sent from my iPhone

Key Words:
Cathedral ceiling rake crown molding miter and bevel angles
Vaulted ceiling rake crown molding miter and bevel angles
Sloped ceiling rake crown molding miter and bevel angles



Rake Crown Moulding Nested

All nested crown moulding cuts in the horizontal plane, with the bottom edge of the crown moulding nested against the fence are the same as purlin or square tail fascia cuts.

All nested crown moulding cuts in the vertical plane, with the top edge of the crown moulding nested against the fence are the same as gable end verge-barge-fascia rafter cuts.




You can use perpendicular bisecting lines to find the miter angles for nested crown moulding  for horizontal crown moulding or rake crown moulding. Just like we do with horizontal crown moulding by calculating the nested miter angle in our head, the rake crown moulding nested miter angle can also be easily calculated in our head. If the rake crown moulding intersects  horizontal crown moulding, then the miter angle for nested rake crown moulding is the roof slope angle divided by 2. In this next drawing the roof slope angle is 40°, therefore the miter angle will be 20°. For the rake crown moulding at the top of a sloped ceiling or gable end the miter angle is the same as the roof slope angle. Since, we're not turning the rake crown moulding in the horizontal plane the saw blade bevel angle is set at 0.00°.













Rake crown moulding that also turns in the horizontal plane will use the saw blade bevel angle equal to the bisected horizontal corner wall angle for the nested crown saw blade bevel angle.  

In this next drawing using three different profiles for the crown moulding with the crown nested in the miter box or miter saw with the Wall corner angles = 90.00°

Face A  Miter #1
Miter = 45.00°
Bevel  = 0.00°

Face B  Miter #2
Miter = Roof Slope Angle
Bevel  = 45.00°

Face B  Miter #3
Miter = Roof Slope Angle
Bevel  = 45.00°

Face C  Miter #4
Miter = 45.00°
Bevel  = 0.00°

Face C  Miter #5
Miter = 45.00°
Bevel  = 0.00°

Face B  Miter #6
Miter = Roof Slope Angle
Bevel  = 45.00°

Face B  Miter #7
Miter = Roof Slope Angle°
Bevel  = 0.00°





Crown Molding Tools app