The concave area is the interior of the hump formed by the warping.
Warped plywood on roof.
Cdx plywood is a construction grade type of plywood that is designed for.
Reversing the warp can be accomplished by adding moisture to.
It could be an indication of water leaking through the shingles or a.
The plywood might also become warped itself if it becomes wet which could happen in the case of a roof leak.
Damaged decking can be potentially dangerous.
Investigating a warped and wavy roof.
The plywood is nailed to the roof rafters and unless the builder used a tongue and groove plywood or h clips the long edge can warp in between each rafter.
When it comes to choosing what kind of plywood you need for the roof it is important to understand the basic categories that you can choose from.
Any problem with the decking can result in a visible wave on the roof.
If the underlayment or the vapor barrier underneath your roofing material becomes wrinkled it might result in your roof taking on a buckled appearance.
The decking is the plywood that covers your entire roof and is the foundation for your shingles.
Plywood isn t the only wood which can become warped.
Even new plywood can warp if not stored properly or if left in the sun.
Plywood sheathing not butting up nicely all around but warpage here and there is pretty easy to see how the home inspector caught the mold but didn t see the warped sheathing is a head scratcher pretty clear this didn t happen in the last 18 months.
As moisture is absorbed into the wood or leaves it it often causes the boards to warp.
Underlayment not lying flat.
Like the underside of a shriveling leaf the plywood s concave side has lost moisture and shrunk.
What kind of plywood for the roof.
Step 2 set the plywood sheet on a flat surface that has adequate exposure to warm air such as a paved driveway on a warm sunny day.
The easiest way to remove this warp making the board straight again is to use water and heat the same things that caused the board to warp in the first place.
The convex or humped side should face up and the side you sprayed.
Before you give up in frustration though try a little moisture therapy.
