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The solution to bad ventilation and too small rafters.

Posted by jb on July 6th, 2000 02:23 PM
In reply to Sagging Roof by Steven G on July 4th, 2000 12:25 PM [Go to top of thread]

If your ridge is not sagged and the exterior walls are plumb then you definately have sagging rafters. You need to remove the drywall and see how bad it is. If the plywood is rotten, then you need to remove all of the roofing (shingles) and replace the rotten plywood. You then need to replace any rotten rafters. If most of what needs doing is strengthening rafters, then double them up. You need to vent your roof. Remove the plywood near the roof ridge with a circular saw so that you have a 1" slot next to the ridge on each side at the very top of your roof. Then put a ridge vent over your entire roof ridge. This will vent the top. Next, put "vent keepers" under your plywood in every rafter bay. These are cheap styrofoam things that keep the roof insulation away from your plywood and create air ventilation from soffit to ridge in every bay. Then vent your soffit so that air can enter each bay at the bottom. You can do this with a screened soffit vent or also this neat vented drip edge. Good luck

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