Truss questions

[Rodmo1]

Thanks Mike for the link. that was the best info yet on trusses. I wanted to add that the lumberyard I spoke to regarding proper bracing was the builder of the trusses. My style of truss is the "fink" pattern. I will definately add angle bracing after reading that material. Although I am not sure how I will span minimum three trusses with a 45 degree on the web member but it will happen.

Rod M.

 

[WVBill]

I wanted to add that the lumberyard I spoke to regarding proper bracing was the builder of the trusses.

Rod - I will echo what the others have said. The truss manufacturer should have supplied you with sealed permanent bracing documentation along with the sealed truss drawings. When I built the studio building for my wife, I had to provide both with the building permit request - and the building inspector looked at the bracing more than he looked at the trusses themselves. It's a truss system.

 

[Duffster]

Thanks Mike for the link. that was the best info yet on trusses. I wanted to add that the lumberyard I spoke to regarding proper bracing was the builder of the trusses. My style of truss is the "fink" pattern. I will definately add angle bracing after reading that material. Although I am not sure how I will span minimum three trusses with a 45 degree on the web member but it will happen.

Rod M.

Rod. you don't need to worry about it being exactly 45*

If you angle brace back to the third truss would be sufficient

 

[Rodmo1]

I am still waiting on the official paperwork for the trusses so I thought I would post a couple pics of the progress so far.

 

[Duffster]

Looks good, very sturdy

How come your not putting a metal roof on it?

 

[MikeD74T]

Rodmo1, If you liked the last link you'll love this one. http://mainelytrusses.com/pdf/wtca/bcsi_guidebook.pdf No more waiting, it has more truss information than anything I've seen before. Go to their products page for even more info. MikeD74T

 

[Rodmo1]

Thanks Duff and Mike,

I am not putting a metal roof on because I want it to match my house and other outbuilding. In hindsight I probably should have used metal roofing to qualify for the tax credits. It will get dimensional shingles and 4" clapboard siding. Picturing it in my head it looks very nice but I will have to wait and see what reality is. Got very concerned yesterday morning when leaving for work I noticed a very visible bow on the gable end truss. After worrying about it all day I came home and pulled a string only to find out one pole is just 1/2" off 9' up. Amazing how bad 1/2" out of plane can look to the builder/owner and probably no one else. thanks for the sturdy comment Duffster...That was my main goal...I do not want to worry about this building come any foul weather. I put 45* bracing on the long walls and will probably put some on the gable walls as well. Although I think sheathing alone will brace it enough. With all the surrounding trees there is not much ground level wind here.
Anyhow I will post more pics in a couple days when the roof should be done.

Thanks all for the help
Rod M.

 

[yooperdave]

The truss designer will specify what needs to be braced permanently and where.

There should be shop drawings which specifies this.

Compression members not braced as designed may buckle causing structural problems.

Bracing is one of the cheapest ways of stabilizing most structural members.

The roof deck is a diaphragm which will brace the top chord.

Many different load cases are used in the design to determine stress reversals - tension members going into compression which could buckle.

This is not a guessing game - find out from who sold you the trusses to see the shop drawings. Proper bracing is routinely omitted or screwed up by many contractors.

Good Luck

Yooper Dave

 

[Duffster]

The truss designer will specify what needs to be braced permanently and where.

There should be shop drawings which specifies this.

Compression members not braced as designed may buckle causing structural problems.

Bracing is one of the cheapest ways of stabilizing most structural members.

The roof deck is a diaphragm which will brace the top chord.

Many different load cases are used in the design to determine stress reversals - tension members going into compression which could buckle.

This is not a guessing game - find out from who sold you the trusses to see the shop drawings. Proper bracing is routinely omitted or screwed up by many contractors.

Good Luck

Yooper Dave

I agree

But they are just a 24' common, so not real complicated

 

[ldwain]

The industry documents for truss bracing are found at this website: Building Component Safety Information. The BCSI booklet describes the required bracing for truss systems. Specifically, the B10 document describes bracing for post frame buildings. And yes, diagonal bracing is ALWAYS required in truss systems even when the end gable is attached directly to the posts. The diagonals are placed a intervals along the length of the building to transfer the lateral forces that accumulate in the continuous lateral restraints to the roof sheathing and/or ceiling (if supplied).