Would A Roof Sag If Plywood Got Wet

The first one is the rated span in inches for roof sheathing the second.

Would a roof sag if plywood got wet.

But really i don t think it s a big deal just get a dag gone roof on the thing get closed in and get some heat dehumidifier rolling in there. It is never a good idea to install a roof over wet plywood or any type of roof sheathing. Certainly if if is plywood and not osb it would dry to the interior when covered with felt. I think your stuff is fine.

Many of the inner components of your roof such as barriers osb boards and felt are also sensitive to water damage and should not be exposed to moisture. Problems with the roof itself aren t the only reason a roof might sag. Roofing over wet plywood. If your roof is more than 30 years old rebuilding it will be the most effective approach to dealing with sagging.

Wednesday june 13 2018. Address any edges that are of concern to make the roof level and flat before installing the finished roof material but this should not be done until the panels have. On average a roof lasts between 15 to 30 years depending on the design the materials used and your climate. Can roofing felt get wet.

Roofing felt also known as tar paper serves as both an extra layer of protection between the shingles and the plywood and as a temporary moisture barrier until all the. A few showers of rain or a storm on your plywood will be ok as long as it is for only an hour at the most. Some problems relating to a sagging roof line should definitely be evaluated by a professional in the roofing industry. The span between trusses exceeds rating of the sheathing each panel of plywood or osb has a grade stamp on one face like the example shown at below with two big numbers near the top.

It will dry to the inside. Also with that amount of rain plywood and osb may have some swelling at the edges and a thorough inspection of the panels should be done after the panels have completely dried. Does rain ruin plywood. Subfloor delaminated should have use advantech but you are beyond that now.

Plywood is mostly available in 6 9 12 17 19 25 33mm thicknesses. When rain water comes through your roof s shingles the plywood will wrap rot or weaken and this will make the roof look like it is sagging between its rafters. If the sheathing or wood is wet during the time of installation it can trap moisture inside of your roof leading to mold rot or other severe problems. However leaving your plywood out in a rain event overnight is not a good idea.

Trapped water will boil when the sun heats the roof and the shingles will then have small pits where the. Soaking wet roof decking question though allan what experience have you had with wet plywood coated on one side with foil.