Roof Plywood Warped

If in fact it is the truss sagging the only cheep fix is to place shims in between the trusses and plywood from the attic.

Roof plywood warped.

Having wet or poorly placed felt paper under your shingles can cause your roof to be wavy. Underlayment not lying flat. However it could be that the plywood is warped and pulled out the size 8 nails that where used to nail it to the trusses. When referring to asphalt shingles felt paper is what is typically used in this application.

Less likely as a cause of a buckled roof is poor attic ventilation. Cdx plywood is a construction grade type of plywood that is designed for exposure to the elements. This happens most often in hot and humid climates. Movement of the roof deck.

The plywood might also become warped itself if it becomes wet which could happen in the case of a roof leak. An improperly installed roof deck or the sheets of plywood that are underneath your roofing material could result in the plywood shifting. This most commonly occurs. Plywood should not sag since there is a truss every 2ft.

Roof sheathing too thin and rafters too far apart i have to admit i made two mistakes while doing a roof for my 4ftx8ft shed. 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. If the underlayment or the vapor barrier underneath your roofing material becomes wrinkled it might result in your roof taking on a buckled appearance. On occasion poor attic ventilation can cause the sheathing to become warped from underneath.

The causes of these distortions are various but can often be traced to the technique used during installation. It can withstand moisture for a brief period of time but may become warped and delaminated with consistent exposure to the elements. I know this will present problems in the future. Most construction sites will consider the use of either osb or plywood for the roof.

Underlayment is what we call the product placed between the decking and and the shingles. Tools you will need for roofing from amazon bostitch coil nailer https amzn to 2u1v8e2 shingle remover https amzn to 2fzu5wf roof snake https amzn to 2. Roofing is described as warped when there is visible sagging in parts of the structure. First mistake my rafters are 2ft apart instead of 16 inches.

However warped plywood sheathing means the entire roof has to be replaced immediately or it may collapse. Second mistake i used 11 32in plywood instead of something thicker like 1 2in.