The first layer on top of the plywood or OSB roof deck is underlayment ... a shorter rib leg that doesn’t contact the roof surface when laid flat. The rib on the underlapped side has a drainage ...

A flat roof is the easiest type to build and offers ... They'll remove the old membrane, rotted plywood and fascia, damaged roof vents and plumbing stacks. They may also replace insulation.

The type of insulation you should choose will depend on the type of roof you have. Pitched roof – there are two options: warm or cold loft insulation. Flat roof – there are three options available: ...