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Can You Put New Plywood Over Old On A Roof
Can You Put New Plywood Over Old On A Roof. Do i need to put plywood over shiplap for new roof? I have installed new plywood over existing numerous times with out problems.

It doesnt look wavy and 2 other guys said they just would put over t and g. Another reason is curling shingles, as you can only install a new layer if the first one is completely flat and level. As long as the new plywood itself can span the distance and carry the roof, wind, seismic and snow loads for your region, adding new ply over old is just fine.
Apply New Roof Sheathing (Osb) Directly Over Old Sheathing (Sagging ½ Inch Plywood) Or Rip The Old Sheathing Off And Apply New Sheathing To The Trusses?
One thing to consider is that the new plywood probably wants to be the same thickness as what would be used if it was used by itself on the rafters (i.e. Installing a new roof over an existing one can only be done if you have shingles because you can only put shingles over shingles. Similarly, how do you remove old plywood from a roof?
I Ask If This Is Just Increasing Dead Weight Or Actually Helping The.
Another reason is curling shingles, as you can only install a new layer if the first one is completely flat and level. Osb3 or exterior grade plywood are both good deck materials for bonding the new. They said they have to or the roof will be wavy.
The New Plywood Thickness Should Be At Least Equal To The Exusting Plywood Thickness.
This will ensure that the strength of the plywood is enough to bridge spots on the roof where the old plywood was weakened to the point that it would sag under the load on the. 30 votes) the new plywood thickness should be at least equal to the exusting plywood thickness. Beside this, how do i know if my roof sheathing.
Do I Need To Put Plywood Over Shiplap For New 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 not possible to mix materials, nor to install a new layer over slate or wood tiles. If you’re wondering why the roofers can’t just install new shingles and roofing accessories over your existing roof deck, this article will guide you through one of the most common reasons:
Per Square Foot Per Inch Of Thickness.
Make sure your roofer staggers the new plywood joints so it off sets the existing. This is 1970s construction, trusses on 2 foot centers, medium slope, and we plan to use gaf timberline ultra shingles (these are heavy) for the new roof. Here is approximately how much different options cost:
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