Permeable Seamless Roof Surface

The new standing seam metal roof is to be installed over the existing 1x4 skip sheathing so no solid roof deck.

Permeable seamless roof surface.

3 roofing liquid applied membranes seamless roofing solution content 04 sika liquid applied membranes lam 06 applications of sika liquid applied membranes 10 sika s global technology and production competence 12 cool roofs with liquid applied membranes 14 technologies products 20 lam systems for exposed roofs 22 lam systems for green roofs 24 lam systems for refurbishment of old roofs. What sets our products at a level that others can only marvel at is our authentic double tile mat block paver system that is almost 100 larger in size then most other products on the market our flexible rubber paver system has a fake seam down the middle is designed to accommodate and adjust to minor low sloped variations in a roof membrane. In this particular job the roof is vented. Delta trela is a vapor permeable underlayment with structured separation and drainage specifically designed for metal roofs and façades with metal cladding.

While other non porous materials direct water to storm drains these surfaces help ground water recharge by allowing water to flow into open spaces between the materials. Any moisture driven up from the attic will condense on the underlayment underside. The standing seam metal roof does not sit tight on the purlin it is elevated with a steel clip which are spaced every 1 2 feet. But the attic floor air seal is terrible there s a huge attic stair that leaks like a sieve.

Permeable paving is categorized using many different building materials. Photo courtesy galow homes. With the siga majcoat membrane it has a 34 0 us perm rating so it is definitely breathable. The underlayment prevents corrosion and moisture accumulation underneath panels ensuring the longevity of your metal roof.

Above is a peel and stick mineral surfaced roofing underlayment shown during installation of a metal standing seam roof. If you are set on using a permeable roofing. Many types of roofing including epdm and standing seam steel roofing are virtually impermeable to water vapor. Permeable surfaces also known as porous or pervious surfaces allow water to percolate into the soil to filter out pollutants and recharge the water table.

When sun strikes the damp or wet roof surface and it continues to argue that moisture is driven through vapor permeable roofing paper felt and plywood or osb roof decking. However they are all sustainable and allow water to flow through their surface. What is the difference between permeable and impermeable surfaces.