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MetShield HT Underlayment

Best-in-class MetShield ice and water underlayment protects the roof structure from water seepage caused by ice dams and wind-driven rain. Designed specifically for high-temperature applications of Steel, Aluminum, Copper, Zinc*, CRCQ and A606 roof installations. It will resist temperatures up to 250° without degradation of the adhesive, and self seals around roofing nails, screws and clips used to install the primary roofing system. This high-tensile strength underlayment is a 40 mil SBS modified bitumen with a UV-resistant anti-slip polyethylene woven top facer and is required under all Drexel Metals roof warranted systems.

Product Data Sheet
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Physical Properties

Surface – White polyolefin composite with a factory applied anti-skid coated film
Membrane – Rubberized asphalt

Product Specs

Roll weight – 55 lbs
Roll length – 66 ft
Roll width – 36 in
Roll size – 198 sq/ft
Roll coverage – 160 sq/ft*

Rolls per pallet – 25
Rolls per truck load – 650

*Coverage calculated after recommended overlap

Typical Performance Properties

Thickness – test method: ASTM D1970, results: 40 mils
Low Temperature Flexibility – test method: ASTM D1970, results: -45°F
Adhesion to Plywood at 75°F – test method: ASTM D1970, results: 35lbs/ft
Lap Seam Adhesion at 75°F – test method: ASTM D1970, results: 21lbs/ft
Sealability Around Nail – test method: ASTM D1970, results: pass
Slip Resistance – test method: ASTM D1970, results: pass
Thermal Stability – test method: ASTM D1970, results: pass
Moisture Vapor Permeance – test method: ASTM D1970, results: 0.02 perms
Water Absorption – test method: ASTM D1970, results: 0.5%
Tensile Strength Machine Direction – test method: ASTM D412, results: 250 psi
Tensile Strength Transverse Direction – test method: ASTM D412, results: 1390 psi
Elongation at Break Machine Direction – test method: ASTM D412, results: 250%
Elongation at Break Transverse Direction – test method: ASTM D412, results: 170%

Drexel Metals test reports are for specific attachments, material gauges, clip spacing and panel widths. A complete specification and listing is available.

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