It could be an indication of water leaking through the shingles or a.
Warped roof plywood.
The concave area is the interior of the hump formed by the warping.
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.
The convex or humped side should face up and the side you sprayed.
These include weaknesses in the overall structure.
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.
Investigating a warped and wavy roof.
Like the underside of a shriveling leaf the plywood s concave side has lost moisture and shrunk.
What kind of plywood for the roof.
Plywood in a roof deck creates a warped effect when holes in the exterior allow water inside your home.
Cdx plywood is a construction grade type of plywood that is designed for.
The decking is the plywood that covers your entire roof and is the foundation for your shingles.
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.
I use a sponge or sprayer to wet the concave side of the plywood hot water works best.
Spray hot water generously onto the concave area of the warped plywood.
Poor installation may also create movement in the plywood.
Internachi describes some of the effects multiple layers of roofing can have on a home.
Any problem with the decking can result in a visible wave on the roof.