2 Layers Of Plywood On Roof

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The deck is not rotting out except for a few spots along the drip edge which we are cutting out to replace.

2 layers of plywood on roof.

Wood structural panel sheathing or siding used to resist combined shear uplift. 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. Plywood is made with three or more layers of thin wood glued together with the grain alternating. This particular type of plywood is crafted from layers of wood stacked on top of one another with alternating grain patterns in each layer.

The attic was well vented with gable vents so i dont think it is a heat issue. 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. And plywood or osb roof decking thus ultimately into the attic space. 3 8 plywood roof sheathing.

Can you double up plywood roof sheathing without inviting disaster. The roof in question is my neighbors roof i just had seen the contractor putting the second layer of plywood on over the tarpaper and thought it was kind of strange so i thought i would ask. 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 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.

It got nailed over 2 x 12 joists 24 o c. On a 2 12 pitch roof. 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. It is typically made in 4 by 8 foot sheets although longer panels are available for special purposes.

Every house in the neighborhood is being redone and havent seen any other 40 contractors in the neighborhood doing all the plywood installation. I urge you to remove both layers of roofing so that the new roof investment will last as long as its intended to and that you have peace of mind that your roof is sound from top to bottom inside and out. But unlike an asphalt shingle roof. On 4 12 or greater slopes the balance of the roof shall be one layer of 15 felt.

Both osb and plywood for the roof have been approved for use so it. The alternating grain gives the plywood a system of checks and balances that allow it to expand and contract evenly across the sheet.

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