Sheathing and Birds Mouth on Rafter

[EddieWalker]

I put the sheathing up before building the rafters. When cutting my rafters, I like this website for figuring out my cuts. Click on the tab "Roof Calculator" and put in your numbers. Measure from the outside of the sheathing, not the studs.

Calculators for Home Improvement Remodeling Construction

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www.blocklayer.com

ZIP System is a higher quality OSB then regular construction OSB. When cutting it, you will notice that it's more solid and tighter. The green coating allows you to leave it exposed for long periods of time and not worry about the OSB getting wet, delaminating, or being damaged from the weather. When the price was lower, it was a no brainer to go with ZIP System over the less expensive OSB and then cover it in House Wrap. All of my house is done in ZIP System, but last year when I started adding on a 3 car garage, I couldn't justify the cost for it, so I went with regular OSB and House Wrap.

ZIP Tape is used to seal the edges, and it works really good. I keep a roll of it in my truck all the time because it's the very best tape that I've ever come across. It's also gone up in price and it adds a lot to the cost of doing the walls in Zip System. I used the ZIP Tape on my House Wrap where it connects to my house instead of the House Wrap tape. I also use ZIP Tape to seal my widows and doors instead of flashing tape, or House Wrap tape.

 

[ROUSTABOUT]

I like putting sheeting on up to the top plate first, and then make the birds mouth to fit over the sheeting.

To be honest, I have never seen it done another way.

Framing is framing. Birds mouth notches around top plate. Run sheathing to bottom of rafter. Cut 1 x 6 to go between rafter tails and lap over sheathing.
So by what you're saying, put the finish on outside wall before you get it in the dry? Nope, never did that.

 

[Snobdds]

Framing is framing. Birds mouth notches around top plate. Run sheathing to bottom of rafter. Cut 1 x 6 to go between rafter tails and lap over sheathing.
So by what you're saying, put the finish on outside wall before you get it in the dry? Nope, never did that.

I have no idea what you just wrote, but it dosen't matter. As they say, a picture is worth a thousand words....

 

[ROUSTABOUT]

I have no idea what you just wrote, but it dosen't matter. As they say, a picture is worth a thousand words....

Framing is framing. Do your framing first, get your top on, get building in the dry.

 

[Snobdds]

Framing is framing. Do your framing first, get your top on, get building in the dry.

How do you create shear resistance in the walls to make sure your top does not flop around? I don't like framing a wet noodle.

Have you ever built something? I have never heard of such silliness.

 

[ROUSTABOUT]

How do you create shear resistance in the walls to make sure your top does not flop around? I don't like framing a wet noodle.

Have you ever built something? I have never heard of such silliness.

My dad was a contractor and I've been out there getting my azz beat since I was in the second grade. Other than four years in the military, it's all I've done. I'm mid fifties now.

 

[MossRoad]

Framing is framing. Do your framing first, get your top on, get building in the dry.

I've never seen a house built with the roof on before the walls are sheathed.

For that matter, I've never seen roof rafters or trusses put on a house before the walls are sheathed.

Pole barn maybe. Garage stick framed, never.

 

[2manyrocks]

Walls used to be framed with braces let in to the studs. I guess someone somewhere still does it this way instead of sheating.

 

[MossRoad]

Walls used to be framed with braces let in to the studs. I guess someone somewhere still does it this way instead of sheating.

I hope not....

This explains why.

Practical Engineering: Strength of Plywood Sheathing

Short version:
Vertical plywood provides 13 times the shear load capacity of let-in bracing.

 

[Snobdds]

I hope not....

This explains why.

Practical Engineering: Strength of Plywood Sheathing

Yes, Sheet lumber change the game in building.

There is no better sheer resistance than using sheet goods to create sheer walls instead of using let in bracing.

The corners of pole barns are the only place anymore where I can think of where some let in bracing is still used.