2 Layers Of Plywood On Roof

Most building codes allow for two layers of asphalt shingles on a house so stripping off everything down to the plywood sheathing may not be your only choice.

2 layers of plywood on roof.

2000 sf of 1 2 cdx ply went on the roof before i had a chance to take a look at it and it is really sorry stuff. 3 8 plywood roof sheathing. Nailing new shingles over existing ones is less expensive and faster requiring less labor but it also means you lose the chance to assess the sheathing for signs of water damage. On a 2 12 pitch roof.

Even though 2 roof layers are legal we do not like covering over any old roofing materials with another layer because we don t believe in covering up problems. The main issues are that you can hear the plywood cracking and feel it give under you as you walk around. It is typically made in 4 by 8 foot sheets although longer panels are available for special purposes. Can you double up plywood roof sheathing without inviting disaster.

Wood structural panel sheathing or siding used to resist combined shear uplift. The alternating grain gives the plywood a system of checks and balances that allow it to expand and contract evenly across the sheet. This particular type of plywood is crafted from layers of wood stacked on top of one another with alternating grain patterns in each layer. But unlike an asphalt shingle roof.

And plywood or osb roof decking thus ultimately into the attic space. Every house in the neighborhood is being redone and havent seen any other 40 contractors in the neighborhood doing all the plywood installation. Both osb and plywood for the roof have been approved for use so it. It got nailed over 2 x 12 joists 24 o c.

On 4 12 or greater slopes the balance of the roof shall be one layer of 15 felt. Plywood is made with three or more layers of thin wood glued together with the grain alternating. The roof deck turned out to be 3 8 plywood which is starting to break down due to the number of times the roof has been replaced. Also was the plywood in 1960 defective.

The attic was well vented with gable vents so i dont think it is a heat issue. On roof slopes of 2 12 to 4 12 the remainder of the roof shall be two layers of 15 felt applied in shingle fashion or 1 layer of ice dam protection.