Dead Blocks Or Strapping For Trusses

Csavage1

I have a couple questions for the framers here.

How much blocking do you do in the truss area for drywall?
I have been told by a few that the trusses can move and when drywall is installed on the truss the screws can pop. The last job we did had attic trusses and the walls and ceiling in the attic area calls for drywall and i want to hear your input on what you do for this . I have layed 2x 4 flat and screwed them on the truss at 2ft center for a easy hanging job and it seems to make everything real tight.

Now when you do not strap the ceilings and the walls do you install dead blocks at all the perimeters of the ceilings,wall angles(hip style} and at the top and bottom of the wall cavity? There would be about 12 blocks at 22 1/2 inchs long per 2ft stud opening and thats alot of nailers to install. I always seem to install too many blocks but i really like hanging rock and installing base trim when there is a nailer behind that screw.

I will hope to hear your ideas Thanks in advance

Kgmz

We use attic trusses quite a bit.

What I do is block the floor perimeter under the plywood usually with 2 x10's, as this is usually what the bottom chord is. This keeps air from flowing under the floor through the insulation. Then I block the bottom of the wall with a 2 x 6 so that 4" is above the top of the 2 x 10 block and the 1.5" is below the top of the floor block and tight against it, and then caulk it. This stops any drafts form coming under the sheet rock and is a nailer for trim. I have seen some houses where they did not block the bottom of the wall before it was insulated and could see light under the rock at the bottom. Then I block the top of the wall mostly to stop the rock from waving in between the wall studs/uprights of the truss, and run it about 1" above wall line. I don't block the flat ceiling portion as I don't think it does much and the rock will naturally sag down on the wall rock. But do block any sloped ceiling at the top.

A quick pic to give you a idea, and a link to a clearer PDF file.

http://www.zenitram-inc.com/Files/At...ssBlocking.pdf

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Csavage1

Yes thats how we have been installing the nailers for the walls and angles which will keep the walls and nailers tight.. My main concern and question is the 2ft span with 5/8 rock on the ceiling of the attic area and we have 1200 sq ft to hang on 1st floor garage ceiling also.

Thanks for the reply.

naptown CR

5/8" sheetrock is plenty to span the 24" there is no need for additional blocking