Instructions / Assembly
Welcome
HydroStop® PremiumCoat® Liquid-Applied Roong (LAR) – Version 1.3
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DISCLAIMER
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GAF manufactures and sells roofing materials and does NOT practice architecture or
engineering. GAF is NOT responsible for the performance of its products when damage to its
products is caused by such things as improper building design, construction flaws, or defects in
workmanship.
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The design responsibility remains with the architect, engineer, roofing contractor, or owner, and
construction details illustrated and described herein are furnished solely for guidance purposes.
These guidelines should not be construed as being all-inclusive, nor should they be considered as
a substitute for good application practices.
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Under no circumstances does GAF have any liability for costs or expenses arising out of or
associated with the pre-existing presence of asbestos-containing materials or any other allegedly
hazardous substances or materials on the roof to which the new GAF roofing materials are being
applied.
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Information contained in this Manual is presented in good faith and, to the best of GAF’s
knowledge, does not infringe upon any patents, foreign or domestic.
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As a part of its continuing efforts to improve the performance of its products, GAF periodically
makes changes to its products and application specifications. GAF reserves the right to change
or modify, at its discretion, any of the information, requirements, specifications, or policies
contained herein. This Manual supersedes all catalogs and previous Manuals.
HOW TO DETERMINE IF A ROOF IS A GOOD CANDIDATE FOR COATING
When installed on a new roof, a roof coating should:
• Be a component part of the larger warranted roofing system. This will ensure compatibility with the
system and enhance overall performance of the system.
• Be installed after the roof has weathered as necessary. Weathering periods may vary depending
upon the type of system to which the coating will be applied. Use of a primer may also be required
for certain substrates to ensure adequate adhesion.
When installed on an existing roof, a roof coating should:
• Be compatible with the existing roof.
• Extend the remaining service life of the existing roof. Although a coating cannot add life back to a
roof already beyond its service life, it can prevent a roof from aging as quickly as it would without
the coating.
• Only be applied to a roof that drains properly. Some coatings may be adversely affected by the
presence of ponding water. Therefore, areas of the existing roof that pond water should be
repaired prior to coating.
• Only be applied to non-leaking roofs. While coatings may help seal some pinhole leaks not visible to
the naked eye, they will not generally find and repair existing leaks. Accordingly, existing roof leaks
will need to be identified and repaired prior to coating. (Allow repairs to fully dry prior to coating.)
NOTE: When coating over an existing roof coating or an existing coal tar pitch roof, contact GAF
Technical Services at 1-800-ROOF-411 (1-800-766-3411).
GENERAL DESIGN CONSIDERATIONS