permanent truss strapping

[bigbadjim]

I built a 26x46 shop with residential common 4/12 pitch trusses. Does anyone know if there is specific pattern of permanent 1x4 strapping? I strapped the roof every 2' in rows for the roof tin. What I'm asking is does the webs and bottom cords need strapping? I read online that 45degree strapping underneath the top cord is required at each end for lateral loads? Any clarification on what is required or photos would be appreciated.

Oh, I'm in Saskatchewan Canada.

 

[Milton Shaw]

Your truss supplier would have that information. Mine had specific location for the strapping to go in regard to the shape of truss. It varies as the shape/size changes. We had a 18" snow before I got the strapping on them and the roof held anyway. A strongback is the term used for strapping on floor trusses. Very specific location also and specified 2x6 glued etc. So go to your truss supplier or his paperwork might show.

 

[WNYflyer]

Whoever supplied your trusses should be telling you how to brace them. That information should show up on their instructions/erection drawings etc. The truss designer makes certain assumptions in the design concerning the required bracing and thus includes an explanation of the required bracing. Of course that is only for the trusses. How that truss bracing works with the rest of the building.........well that is up to others. When I say by others I am assuming the responsibilty for the rest of the building design is seperate from that of the roof trusses and the design is not a total package.

The below links should give you and idea of bracing that is commonly done but some may not really apply depending on the assumptions made when designing the trusses and the type of bracing/construction the rest of the building has but it is better than nothing. Like the other poster said always go back to the truss designer first though for your specific requirements.


http://www.cwta.net/bracing.php

http://www.tpic.ca/english/pdf/handling.pdf

http://www.sbcindustry.com/bracing.php

Hope this helps some

 

[paullie]

Whoever supplied your trusses should be telling you how to brace them. That information should show up on their instructions/erection drawings etc. The truss designer makes certain assumptions in the design concerning the required bracing and thus includes an explanation of the required bracing. Of course that is only for the trusses. How that truss bracing works with the rest of the building.........well that is up to others. When I say by others I am assuming the responsibilty for the rest of the building design is seperate from that of the roof trusses and the design is not a total package.

The below links should give you and idea of bracing that is commonly done but some may not really apply depending on the assumptions made when designing the trusses and the type of bracing/construction the rest of the building has but it is better than nothing. Like the other poster said always go back to the truss designer first though for your specific requirements.


http://www.cwta.net/bracing.php

http://www.tpic.ca/english/pdf/handling.pdf

http://www.sbcindustry.com/bracing.php

Hope this helps some

you said erection

 

[WNYflyer]

you said erection

Long live the Great Cornholio !!

You would't be a Winger fan also would you

 

[p_mori7]

Not a very good photo, but should give you the basic idea.

You need to tie the last 4 trusses together with X braces on the center member of the trusses. This greatly increases thier resistance against the wind trying to topple them over.

I used a couple of left over 1"x3"x10' and nailed them with 2-1/4" nails. Since your building is quite a bit larger than mine, it may require additional bracing...

My trusses are still exposed inside the building, so I can try for a better shot tomorrow if you want it.

Very nice building BTW !

 

[bigbadjim]

I never even thought of just calling the supplier, I didn't get any info with the trusses and couldn't find squat on their website either. I called the truss company today and the engineer said I need bracing on the bottom cord 10' in from each side wall all the way down the center of the building. She also said I need to ridge block the trusses at the peak of the building.

45 degree bracing inside the trusses, web bracing and hurricane ties nailed to the top plate are all optional she said.

 

[camarotoolman]

Don't for get to put your "rat runs" 2x4s nailed lenght ways in. Here you have to put truss "clips" on the ends nailed to your top plate. That keeps the roof from lifting in the wind.