4/15/2026 1:00 AM (PST)

The permeability, or perm rating, of roofing underlayment determines how much water vapor can pass through the material from the interior of the house. Breathable underlayments are essential in certain climates to allow moisture trapped in the attic to escape, preventing condensation and mold growth within the roof assembly. If a non-permeable material is used in a poorly ventilated space, it can trap humid air against the wood, leading to hidden decay. Selecting a product with the correct perm rating ensures a balanced ecosystem within the roofing system, promoting longevity and air quality. Visit Here - https://www.singhalglobal.com/products/rockshield-mesh-pipe-protection-net