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MetShield High-Temp Underlayment ®


Replace water-damaged sheathing and sweep roof deck thoroughly.


Priming: Priming is not required on clean, dry wood, metal or most polyisocyanurate surfaces. Masonry and


exterior gypsum boards (such as DensDeck® ) should be


primed using an appropriate primer or adhesive. Some rigid insulation boards with porous or dusty surfaces may require priming to promote initial adhesion. Priming is required on all substrates when air or substrate temperatures are below 40°F (4.4°C). Adhesives such as CCW-702, CCW- 702WB, CAV-GRIP™ and CCW-AWP are approved for use with Drexel MetShield. Refer to your local building codes to determine acceptable product for use in your region.


Selection of roof deck or insulation substrate and/or use of a primer or adhesive are the responsibility of the architect, specifi er or roofing contractor to determine based on the roof assembly and environmental conditions.


Valleys, hips and ridges: Cut MetShield roofing underlayment into manageable lengths. Align over the


center of the valley, hip or ridge. Remove release film. Press the middle of the membrane first before working toward the edges. For open valleys, cover MetShield roofing underlayment with metal valley liners.


Eaves and rakes: Cut MetShield underlayment into 10-15' pieces. Remove 2-3' of release film and align the edge of


the membrane, sticky side down, so it overhangs the drip edge by 3/8" (10 mm). Continue to remove release film and press as you move across the roof. Use a hand roller and/ or hand pressure to press into place. Overlap end laps a minimum of 6". MetShield roofing underlayment should reach a point 2' inside the interior wall line. Local codes may require additional courses. If additional courses are required, the top lap must be at least 3-1/2".


Drip edges: At the rake edge, apply MetShield underlayment first and place drip edge on top. At the eave,


apply drip edge first and place MetShield underlayment on top of the drip edge so that it overhangs drip edge by 3/8" (10 mm). For standard installation details, follow the MetShield detail drawings. For non-standard installation instructions, contact your local Drexel Metals representative.


Metal roof underlayment: Under water-shedding metal roof systems or low-slope metal roofs with a minimum 1/2"


slope, start at the low point and apply MetShield over the full surface of the roof deck. Review the metal roofing manufacturer’s instructions for limitations and precautions. Beginning at the eaves, apply underlayment from the low point to the high point of the roof, running the roll horizontally.


Limitations


• MetShield should be installed when air, roof deck and membrane temperatures are at or above 40°F (4.4°C).


• MetShield should not be left exposed to sunlight for more than 120 days.


• MetShield membrane should not be folded over the roof edge unless protected by a gutter or other flashing materials.


• The primary roof system must be ventilated to prevent excessive moisture build-up in the interior structure.


• Use caution during the installation of the membrane as it may become slippery when wet or covered with frost.


• MetShield must not to be used in contact with flexible PVC material.


• MetShield not approved for use in foam set tile applications.


Product Specifications Physical Properties


Surface


Black/White Engineered Polyolefin Composite


Film with Factory-applied Anti-skid Coating


Membrane Product Characteristic


Roll Length Roll Weight Roll Size Roll Width


Typical Performance Properties Thickness


Low Temperature Flexibility Adhesion to Plywood at 75°F Lap Seam Adhesion at 75°F Sealability Around Nail Slip Resistance Thermal Stability


Moisture Vapor Permeance Water Absorption


Tensile Strength Machine Direction Rubberized Asphalt


Units feet


lbs sq/ft inches


Test Method ASTM D1970


ASTM D1970 ASTM D1970 ASTM D1970 ASTM D1970 ASTM D1970 ASTM D1970 ASTM D1970 ASTM D1970 ASTM D412


Tensile Strength Transverse Direction ASTM D412 Elongation at Break Machine Direction ASTM D412 Elongation at Break Transverse Direction ASTM D412


Packaging Information Boxes (rolls) per pallet


Results 66


55


198 36


Results 40 mils


-45°F


35 lbs/ft 21 lbs/ft Pass Pass Pass


0.02 perms 0.5%


250 psi 1390 psi 250% 170%


25


1234 Gardiner Lane, Louisville, KY 40213 888-321-9630 toll-free • 502-690-6174 fax


w w w . d r e x e l m e t a l s . c o m


owned by the U.S. government. CAV-GRIP is a trademark of Carlisle Coatings & Waterproofing Incorporated. Warranty statements mentioned are outlines: complete Limited Warranty information is available on request. No other warranty expressed or implied is applicable.


©2013 Drexel Metals, Inc. All rights reserved. MetShield is a registered trademark of Drexel Metals, Inc. DensDeck is a registered trademark of Georgia-Pacific. ENERGY STAR name and logo are registered U.S. marks and are ® ®


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