CONTRACTORS GUIDE Section 4 - URETHANE FOAM ROOF
REPAIRS AND COATINGS

REPAIRING HOLES ¼" TO ¾" DEPTH
REPAIRING BLISTERS
COATING A PREVIOUSLY COATED FOAM ROOF


PRODUCTS REQUIRED:

NOTE:

To repair holes which are deeper than 3/4", a 24 hour cure time must be provided between each "lift". An option is to use insulation board or suitable lumber to partially fill the hole, leaving
1/4" to 3/4" to be filled with OHM'S FOAM ROOF REPAIR.
4-1 REPAIRING HOLES ¼" TO ¾" DEPTH:

1. Remove the surface oxidation on exposed urethane foam with a scraper or wire brush.

2. Apply POLAR CAP PRIMER/ROCK LOCK (PC-106) diluted 1 part primer to 1 part water. Do not puddle the primer - a thin coat is preferred.

3. Apply OHM'S FOAM ROOF REPAIR (PC-105) to a maximum depth of 3/4". Tamp firmly then smooth the surface. Allow 24 hour cure time.

4. Seal the surface by applying a thin coat (approximately 1/16") Polar Cap White Elastomeric Plastic Cement (PC-107).

5. Coat the roof as described below (4 - 3).
4-2 REPAIRING BLISTERS:

1. Cutting at a 45 degree angle, cut only to the depth required to remove the blister. Many times when several layers of foam were applied, only the top layer of foam is affected.

2. Proceed as outlined above. (Steps #2 and #3)

IMPORTANT - CURE TIME IS AFFECTED BY WEATHER CONDITIONS
(SEE SECTION 11-1)
4-3 COATING A PREVIOUSLY COATED FOAM ROOF:

1. Choose a clean/prep method suitable for conditions; pressure wash, broom and blower, broom and water, Tri Sodium Phosphate solution on ponding areas (See Section 2).

2. Allow to dry.

3. Be sure to remove all loose pealed or blistered coating.

4. Using a low pressure (garden-type) sprayer, apply POLAR CAP PRIMER/ROCK LOCK (PC-106) diluted 1 part primer to I part water, to all stained ponding areas as well as any exposed foam. If the coating has deteriorated due to sunlight exposure, brush or scrape away any oxidation layer and prime before proceeding with repairs or coating.

APPLYING THE COATING

NOTE:

Foam roofs which have absorbed moisture will require an extensive period of dry weather to ensure that moisture is not trapped. If Polar Cap repair products or roof coating do not cure as soon as expected, allow additional drying time before proceeding. Carefully review the sections 11-1 and 11-2 prior to application of Polar Cap roof coatings.

5. The general condition of the roof surface will dictate the proper coverage rate. Use the following guidelines:

(a) 1 gallon per 100 square foot applied in 1 or 2 coats is recommended if the surface is in good condition with nothing more severe than light surface cracks or hail damage.

(b) 2 gallons per l00 square feet applied in 2 or 3 coats is recommended for pitted surfaces which have exposed the foam. This coverage rate is also necessary for any areas which have been repaired.

(c) 3 gallons per l00 square feet applied in 3 or 4 coats is recommended for the areas which pond water.

6. Apply the coating with a long nap roller, or specialized piston type sprayer. The initial coat should always be back rolled.