Im building a small barn (first time , my biggest project yet). and I wonder if anybody here had any experience with this.
Im building the trusses now (9 in total, Gambrel roof). I made a template for this. but the last 4 trusses were slightly different : 0.3 inches taller.
Will this difference affect the roof construction or when is time to apply sheathing to the roof? is this a big deal? this is a big roof for a 10 by 20 barn. and the trusses are a bit difficult to build for me. Any help or advised will be wonderful

 

Welcome to the forums!

Did they progressively get bigger or did the template get altered?
It shouldn't be a big deal, might not even be noticeable.

 

Your sheathing for the roof will bend over the hump and not have an issue. Just don't put the smallest one next to the largest one. A gradual increase will never be noticed. .3" is probably better tolerance that most stick build homes.

Guess what, you are the only one who will know.

 

OK, I'm going to be the bad guy Is the truss a design approved for that type structure? What is the load factor? How are the components joined? Home made trusses will be a bear to handle unless built to take a bunch of stresses while lifting as well as the load placed upon them once they are sheathed. It just scares me a little unless there was a structural engineer involved in the design process, which wasn't stated.

 

Gambrel trusses are probably the most difficult to build as they rely on the side plates for much of their strength, those angle corners. Do you have a bottom chord (ceiling joist) forming a ceiling in this barn so your truss looks like a squashed circle or capitol "D" laying on the flat? Do you have a collar tie across those corners near the top?

I have to agree with chandler in his concern about home made trusses. I have used them for sheds, but a larger building would need permits in my area and they would require engineered trusses. Your home owners insurance might not cover this building if not designed properly.

Bud

 

I had no idea the template is nail to a plywood piece.

 

I got permits for the shed, and I'm following the plans, yes I had bottom cord
I'll try to send a picture of the truss here so you can see it.

 

Yes I got a plan for the shed and a plan for this she trusses.
Load factor is ok for edmonton and the amount of snow we get here( a lot)
The component are joined with gusset (ridge, simple, side, knee gusset) on both sides of the each truss.

 

Does any body knows how to post a pic here with a smart phone?

 

http://www.doityourself.com/forum/el...rt-images.html