24 Jul 2017
- BY admin
- POSTED IN Education, Roof Damage
- WITH 0 COMMENTS
- STANDARD POST TYPE
The underlayment of a roof is the black paper that’s laid over the plywood sheeting in order to seal the roof from damaging elements (snow, rain, ice, etc.). The use of a membrane is typically required, a waterproof membrane, a sweat sheet or vapor barrier — with the underlayment paper serving the triple function.