Do You Need Plywood Under Metal Siding

Metal roofing requires a solid substrate.

Do you need plywood under metal siding.

Plywood cabinets the wood that goes under residential siding exterior sheathing performs several functions. No the purposes of the plywood roof decking are to give lateral stability to the rafters trusses and create a walking surface. It depends if you need the shed heated for any thing if not no you do not need a plywood layer. For many applications a layer of plywood underneath your metal roofing is an unnecessary expense.

Rotted sagging areas in your roof s plywood decking should be replaced prior to installing metal panels in order to prevent costly repairs in the future. Metal roofing should serve both these purposes i m. In a barn shop or other outbuilding you can attach your metal roof directly to the purlins. Considering when to.

It adds insulation waterproofing and structural support for the framing.