Underlayment For Low Slope Metal Roof

Ft coverage sbs modified asphalt polyester self adhered low slope roofing roll in black model lb323235.

Underlayment for low slope metal roof.

The traditional and most common material used for roof underlayment on a steep slope metal roof is non perforated asphalt impregnated felt underlayment. Underlayment is important for a metal roof you get night time condensation on the underside of the panels you don t want that to get into your deck. Gcp applied technologies grace ice and water shield 36 in. Install the roofing panels and seal between the pipe and panel with a caulking rated for use on metal roofs.

15 underlayment as shown. There are several types of felt underlayment including both organic reinforced and inorganic reinforced. Ft model 5003002. They commonly are designated as type 15 and type 30 or referred to as no.

With slopes from 2 12 to 4 12 use a double layer of no. For low slope roofs in cold climates where ice dams and ice dam leaks are likely bliss recommends a double layer of no. Third underlayment layer there is a third product that is sometimes used and specified in new construction. 15 felt underlayment as shown in figure 2 3above.

It is akin to cedar breather. Asphalt saturated nonperforated organic felts are among the most common underlayments used for metal roof systems. 30 which are reflective of a once used pound per square weight designation. That product is a mesh that would go on top of and over the other underlayment used.

Peel and stick is only needed for low slope or if your roof has a issues with ice dams 4a doesn t sound like a climate for that. Dry fit the roof boot and mark the location of the top of the gasket on the pipe.