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MetShield Synthetic Underlayment ®


compliant with applicable building codes. MetShield®


Synthetic is not designed or intended to be the


final or primary roof. Consult with your local Drexel Metals sales representative for further information. As with all roofing materials, always observe safe roofing practices (OSHA) and local building and safety codes. Use caution when walking or standing on MetShield®


ice, debris and other job-site conditions may change the coefficient of friction of MetShield®


Synthetic. Moisture, dust, snow, Synthetic. Failure to use


proper safety equipment and footwear can result in serious injury or death.


Installation General: Fastening methods and materials should conform to best building practices and local job-site conditions. Verify final application to be compliant with the requirements of applicable building codes. Verify compatibility according to geographical region, structure type and roof specification with applicable building codes and/or by review of a building professional. Install MetShield®


Synthetic print


side up, horizontal (parallel) to the eave, with minimum 4 inch (102 mm) horizontal laps and 6 inch (152mm) vertical laps. Overlaps shall run with the flow of water in a shingling fashion.


Installation Guidelines and 35-Year Limited Warranty:


• Minimum finished roof slope is 2:12 (17%) for MetShield® Synthetic. In the cases where the roof pitch is less than 2:12 use MetShield®


High Temp Peel and Stick by Drexel Metals.


For roof slopes greater than 2:12 (17%) and less than 4:12 (33%), laps shall be increased to 25 inches (635 mm).


• In jurisdictions where the use of MetShield®


valley applications is permitted by local building codes, Drexel Metals recommends that MetShield®


• Extend MetShield®


Synthetic in Synthetic be


applied as a valley liner in accordance with applicable building codes and industry standards/guidelines. Woven or closed-cut valleys are not recommended.


Synthetic one inch past gable/rake edge,


turn down over edge, fasten approximately 4 inches on center and cover with code-compliant flashing prior to the installation of the final roof covering.


Short-Term Exposure:


• For short-term exposure (less than 24 hours before the primary roof installation is completed) without exposure to precipitation or high wind (any signs of underlayment uplifting), corrosive-resistant fasteners may be used to nominally attach the underlayment only as necessary to prevent distortion around fasteners in high traffic areas. The final roof covering will permanently affix the underlayment in place.


Two to 29-Day Exposure:


• Applications that are not immediately covered (within 24 hours) by the primary roof covering or are subject to basic


wind speeds (fastest mile) in excess of 90 miles per hour (145 km/hour, Uniform Building Code) or basic wind speeds (3-second gust) in excess of 110 miles per hour (177 km/ hour, International Residential Code and International Building Code) shall be attached using corrosive resistant mechanical fasteners, spaced 8 inches (203 mm) on center along both horizontal and vertical laps and 24 inches (610 mm) on center along the center of the roll in the field of the roof.


Thirty to 180-Day Exposure:


• For underlayment applications that are not covered by the primary roof covering within 30 days and/or for applications in high wind (any signs of underlayment uplifting) zones, lap widths shall be doubled and fastening frequency increased to 4 inches (10.2 cm) on center for horizontal and vertical laps and 24 inches (61 cm) on center along the center of the roll. Additionally, it is recommended that a caulk or sealant material(1) be applied between laps before fastening to prevent moisture ingress in areas of high wind. For a primary roof covering requiring attachment through a batten system, the underlayment need only be preliminarily attached pending attachment of battens or counter battens. Battens or counter battens shall not be secured directly over raised fasteners, including plastic capped roofing nails.


Repairs:


Repair damage to the underlayment with caulk or sealant material maintaining a water-tight seal around the damaged area and proper overlaps to run with the flow of water in a shingling fashion. Ensure any incorrectly applied fasteners are caulked and/or sealed to prevent possible moisture ingress.


Precautions: • MetShield®


Synthetic can be exposed to ultraviolet conditions for up to 6 months.


• Severe weather and/or local job-site conditions may require a shorter exposure period. Please contact Drexel Metals for further information.


• MetShield® Synthetic is not designed to function as the


primary roof covering and is intended to function as a secondary water shedding layer under most steep-sloped roofing materials.


• Verify final application to be compliant with applicable building codes.


A 35-YEAR LIMITED WARRANTY APPLIES TO DREXEL METALS. NO OTHER WARRANTY, EXPRESS OR IMPLIED, IS GIVEN AS TO THE MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE OR OTHERWISE FOR APPLICATIONS OUTSIDE THE SCOPE OF THESE INSTALLATION GUIDELINES AND THE PUBLISHED 35-YEAR LIMITED WARRANTY.


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 ©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 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.


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