roof issues

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Posted by: from Port Moody
7/27/2011 at 7:36:20 PM

on a brand new garage, in the permit and plans it designates that the typical roof construction should have 2x10 rafters at 16" o.c and 2x4 strapping at 24" o.c then 3/8" ply, yet the workers don't put in the 2x4 strapping. please advise the course of action to discuss with the contractor. The ply is on, the shingles are on and the roof leaks.

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Date/Time7/27/2011 at 10:13:09 PM

Hi Alex! First off 2x10 rafters on 16 centers is strong enough without the 24 strapping. However to have the kind of framing there with 3/8 plywood is just plain dumb. A roof in my opinion should be no less than 3/4 of anything and with plywood tongue and groove. Tell your contractor to fix the leak and follow the building code of no less than 5/8 on the roof tongue and groove. Sounds like over kill on the rafters what is the pitch on the roof? I'm interested. Hope this helps.


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Alex in Port Moody
Date/Time8/1/2011 at 10:52:05 AM

Hello Brent, the 2x4 strapping was for proper venting as the space is going to be insulated, was suppose to be stick framed at 2x10, and was changed without my knowledge to engineered roof trusses to 2x8, all the while the contractor knows we need to achieve the R40. So the strapping was more to vent the roof so the insulation doesn't accumulate the moisture from being in direct contact with the plywood. pitch of the roof is 10.5 - 12.

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