Instructions / Assembly
Care & Preventative
Maintenance
HydroStop® PremiumCoat® Liquid-Applied Roong (LAR) – Version 1.3
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ROOF SPECIFIC LEAK INVESTIGATION
On metal decks, it is important to idenfy the direcon of the deck utes and deck slope. Moisture
may inltrate through the roong system, migrate in the lower utes of the deck, and leak inside the
building in low areas.
On concrete decks or on projects where the exisng roong material is le in place, leaks may result
from moisture entrapment in the original installaon.
On poorly insulated roong assemblies, leaks may occur as the result of condensaon. It is therefore
important to determine the leak locaon and frequency. Sources of air leakage should be sealed if
possible.
1. Begin leak invesgaons by conducng a thorough visual inspecon of the general locaon
on the roof where leaks have been detected inside the building.
2. Inspect detail areas such as drains, vents, scuppers, HVAC and other roof-mounted
equipment, parapets, ponded water areas, etc. If the roof is dry at the me of invesgaon,
areas where water ponds can be idened by evidence of accumulated residue on roof
membrane.
3. Examine lower areas of the roof for moisture beneath the roof coang system (so
insulaon can be detected when walking over the roof).
4. Check areas around mechanical rooop equipment, drains, skylights, roof hatches,
expansion joints, pipes, vents, etc. to idenfy cuts or punctures in the coang membrane.
5. Examine the condion of metal ashings (i.e., edging, coping, expansion joint covers,
parapet caps, etc.) for cracks and improperly sealed joints.
6. When a visible source of the leak has not been idened, wet the system at the ancipated
leak area with water and examine the interior area for leaks.
7. Oen, an inspecon of the underside of the deck will reveal signs of water leakage and/or air
inltraon.
EMERGENCY REPAIRS
GAF must be notified of any leaks within 30 days of discovery of a leak or GAF will have no
responsibility for making repairs or replacing that portion of the products that leak as a result of a
manufacturing defect. The Building Owner may make temporary repairs to minimize damage to the
building or its contents in an emergency. Only qualified workers should perform temporary repairs.
These repairs will not result in cancellation of the applicable guarantee or warranty as long as they
are reasonable and customary and do not result in permanent damage to the GAF roofing materials.
When weather conditions permit, permanent repairs should be completed by a GAF-certified
contractor at GAF’s direction if it is a covered leak or at the building owner’s direction for non-covered
leaks.
Repairs should not be made with asphalt-based products unless a wet patch type product is needed
for emergency purposes. If wet patch products are used they must be completely removed at the time
permanent repairs are made.