Underneath it is the attic space followed by a suspended ceiling.
No sheathing under roof.
When open cell spray foam is used a low perm class ii vapor retarder is installed where required.
Plywood has an r value of 1 25 and fiberglass batts have an r value of 3 14.
8d ring shank nails should be used instead.
Sheathing is installed perpendicular to roof trusses.
Owners of agricultural buildings man caves and horse barns all are worried about the corrosive effects of condensation.
Never attach roof sheathing with staples.
It is nailed directly to the rafters.
More effective insulation with r values ranging from 3 6 to 8 0 rigid foam sheathing has much better insulation per inch than other materials i e.
July 28 2017.
3 benefits of rigid foam sheathing.
Modern metal roofs are expected to last 30 years or longer.
While metal roofing doesn t require plywood underlayment there are circumstances in which you may wish to install plywood to anticipate future roofing needs or to offer additional soundproofing.
Sheathing should be a minimum of 19 32 inch thick.
A leak free roof membrane that is fully adhered to the roof sheathing should be installed.
If you re wondering how to prevent condensation under a metal roof you re not alone.
Currently there is no sheathing or tar paper under the metal.
Here s how to fight back against the enemy within.