Would A Roof Sag If Plywood Got Wet

Roofs are framed with rafters or trusses which are rafters joined by internal braces so they install as a single component.

Would a roof sag if plywood got wet.

I am thinking of having an additional layer of plywood or osb added to the roof. With the shingles on it sill still breathe. 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. 15 and 30 felts will breathe.

Rafters run from the peak of the roof. 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. I thought i would share my experience and how i managed to save those sheets. Remedies for a sagging roof there are a number of remedies for traditional rafter style roof frames depending on the problem and its severity.

The underside will breathe. I haven t had any problems and the house is 40 years old but it bothers me when i walk on the roof and feel the roof sag under my weight. Dwight barnett answers home improvement questions. Some problems relating to a sagging roof line should definitely be evaluated by a professional in the roofing industry.

My neighbor had an additional 3 8 layer of plywood added. It is possible that the top side was wet when they put the roofing materials on and over time the wood got soft and sagged. The top 3 sheets of plywood got wet and were actually soaked in water. Soaking wet roof decking osb roof sheathing gets rained on all the time up here and roofs are the first cover to go on a framed structure.

Also there don t seem to be any sags or dips on the east facing side of the roof or if there are they are much smaller and barely noticable. Often the framing can be bolstered and beefed up internally but if the roofing material needs replacement anyway it may be best to tear off the old sheathing and install larger rafters while the roof. The minimum plywood for roofing. When the sun shines it dries.

Plywood can get wet over short periods of time and be dried out and still maintain its strength and finish. 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. This raises a question can plywood get wet.