Instructions / Assembly

Care & Preventative
Maintenance
HydroStop® PremiumCoat® Liquid-Applied Roong (LAR) – Version 1.3
48
ROOF SPECIFIC LEAK INVESTIGATION
On metal decks, it is important to idenfy the direcon of the deck utes and deck slope. Moisture
may inltrate through the roong 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 exisng roong material is le in place, leaks may result
from moisture entrapment in the original installaon.
On poorly insulated roong assemblies, leaks may occur as the result of condensaon. It is therefore
important to determine the leak locaon and frequency. Sources of air leakage should be sealed if
possible.
1. Begin leak invesgaons by conducng a thorough visual inspecon of the general locaon
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 invesgaon,
areas where water ponds can be idened by evidence of accumulated residue on roof
membrane.
3. Examine lower areas of the roof for moisture beneath the roof coang system (so
insulaon can be detected when walking over the roof).
4. Check areas around mechanical rooop equipment, drains, skylights, roof hatches,
expansion joints, pipes, vents, etc. to idenfy cuts or punctures in the coang membrane.
5. Examine the condion 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 idened, wet the system at the ancipated
leak area with water and examine the interior area for leaks.
7. Oen, an inspecon of the underside of the deck will reveal signs of water leakage and/or air
inltraon.
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.