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.
No sheathing under roof.
Never attach roof sheathing with staples.
Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.
If you re wondering how to prevent condensation under a metal roof you re not alone.
Here s how to fight back against the enemy within.
How to prevent condensation under a metal roof.
Owners of agricultural buildings man caves and horse barns all are worried about the corrosive effects of condensation.
3 benefits of rigid foam sheathing.
It is nailed directly to the rafters.
8d ring shank nails should be used instead.
Sheathing should be a minimum of 19 32 inch thick.
Modern metal roofs are expected to last 30 years or longer.
Sheathing is installed perpendicular to roof trusses.
Underneath it is the attic space followed by a suspended ceiling.
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.
The current state and local building codes for the minimum r value of air impermeable insulation required for the roof assemblies in the home s climate.
Plywood has an r value of 1 25 and fiberglass batts have an r value of 3 14.