Metacrylics - Urethane Foam Roofing Application

Choose your application:

New construction

Granulated capsheet

Tar & gravel roof

Commercial spray

Corrugated metal

Mobile home roof

Walking decks

Urethane foam

Exterior wall surfaces

Asphalt & driveways

Maintenance Re-Coat

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TOOLS

STEPS

IMPORTANT INFORMATION

URETHANE FOAM ROOFING
How to install a permanent waterproof roof over any existing Urethane Foam Roof.

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CALCULATING HOW MUCH MATERIALS TO BUY ENTER Square Feet Press TAB DIVIDED BY 100 = Roofing SQs
Acrylic CLEAR PRIMER	0.5 Gallon MULTIPLIED BY	SQs =	Gallons
Acyrlic BASE	5 Gallons MULTIPLIED BY	SQs =	Gallons
Acrylic WHITE	4 Gallons MULTIPLIED BY	SQs =	Gallons
Polyester FABRIC	1 Square MULITPLIED BY	SQs =	SQs

3-COURSE MATERIALS * ENTER Lineal Feet Press TAB
Acrylic GEL (with 4" Fabric)	Lineal Feet	DIVIDED BY 33 =	Gallons
Acrylic GEL (with 6" Fabric)	Lineal Feet	DIVIDED BY 22 =	Gallons
FABRIC	Lineal Feet	DIVIDED BY 160 =	Rolls

* Measure the lineal footage of all base and curb flashings (metal nosings), penetrations, skylights, vents, walls, and parapets. These areas will be 3-Coursed with Gel and Fabric. If using a 4" width of Fabric, divide lineal feet by 33. If using a 6" width, divide by 22 to obtain gallons of Gel.

Tools Required for Application

Download CAD drawings of installation keypoints
(click Here)

STEP 1: Preparation of Foam Roof and Application of Primer

Thoroughly clean and vacuum or power wash the foam surface. Avoid water on areas where the foam is porous and could absorb water. It is very important to avoid application over any areas with extensive trapped water underneath the foam. The foam should be removed, and the areas allowed to dry out. Remove damaged foam areas by cutting square or triangular shapes with a utility knife or hole saw. Check for any damaged or rotten plywood and replace with new plywood.

Buy a 4'x 8' sheet of rigid foam insulation of comparable thickness from your roofing materials distributor. After cutting and inserting the new foam into the roof, tape the new foam to the old foam with duct tape or 3-Course according to SECTION 3. If no Polyester reinforcement is used, the replacement foam MUST BE 3-Coursed!

Apply Metacrylics Acrylic Primer @ 1/2 gallon/100 sq. ft. with an airless sprayer, soft bristled broom, or 1/2" medium nap roller cover. Stir the primer thoroughly before each application. Allow 4 to 24 hours drying time, or dry enough to walk on. After priming, 3-Course any repairs with Gel and Fabric (see STEP 3).

STEP 2: Application of Acrylic Base and Fabric *

*IMPORTANT: To receive a 10-year renewable warranty, the complete Metacrylics system, including Fabric, must be used. However, if no warranty is needed and you would prefer to just re-coat the Urethane Foam, DELETE STEP #2 (Installation Of The Acrylic Base and Fabric) from the installation process.

	Start at the furthest point from your ladder so you can get off the roof when finished. When beginning the job, pour a very small amount of Base out and spread it 40" wide and 2 to 3' long. Apply the Base @ 3 gallons/100 sq. ft.
	Embed the 40" Fabric into the fresh Base, removing any wrinkles by pulling on the Fabric. Avoid tenting (trapping nails or rocks underneath the Fabric). The Fabric should conform naturally to the roof surface. Press the polyester into the Base with the roller or broom. *IMPORTANT: Press all polyester seams down firmly; i.e., press sidelaps down firmly with the roller or broom.
	Immediately apply a cover coat of Base @ 2 gallons/ 100 sq. ft. over the Fabric. Overlap Fabric sidelaps and endlaps 3" (all 40" rolls have a red line to guide you). Press sidelaps down firmly with roller or broom. If any Base is left over, it is imperative to apply additional coats until all the Base has been applied. Allow 24 to 48 hours drying time. *IMPORTANT: Start early, stop early! On warm days the Base dries fast, so don't apply too much before laying out the Fabric. Keep rollers, brooms, pail and water in the shade when not in use. A light mist of water can be sprayed over the Base (with spray or spritzer bottle) to slow down the drying time.

STEP 3: Application of 3-Coursing

	For use as reinforcement of parapet walls, A/C's, perimeter flashings, roof penetrations, skylights, vents, chimneys, solar collectors, blisters, and other repairs. Using a rubber glove, apply a smooth layer of Gel over the area to be reinforced or repaired. Be sure to overlap the field area of Base and Fabric at least 2" and at least 2" up the penetration, curb, or wall.
	Immediately embed a layer of Fabric into the Gel. Press the Fabric firmly into the Gel with the glove.
	Immediately apply a smooth layer of Gel over the Fabric. If desired, brush the wet Gel lightly with a paint brush. Allow 12 to 24 hours dry time. The Gel is available in White or Gray. The Gray Gel should be used in low temperature conditions as it dries twice as fast as the White Gel.

STEP 4: Four Applications of Acrylic White (or Color)

Apply four applications of Acrylic White @ 1 gallon/100 sq. ft. each application (a total of 4 gallons/100 sq. ft.). Allow 12-24 hours drying time between each application or dry enough to walk on. *NOTE: Very smooth surfaces may require 5 or 6 applications or Acrylic White to install the total of 4 gallons/100 sq. ft.

Important Application Information:

* Do not apply products if rain is imminent within 24 hours, or during fog or drizzle. Metacrylics products are water-based and could wash off if not fully cured. Do not apply when temperatures are below 40° F.

* Protect materials from freezing and extreme heat. The Acrylic White dries slowly when temperatures are below 55° F. Dark colors dry much faster. Areas shaded from sunlight dry very slowly. 72 hours or more may be required for proper curing.

* Do not thin or add solvents.

* Keep away from children.

* Caution! Wet acrylic is extremely slippery when stepped on. Use a safety rope around you on sloped surfaces.

* Always stir the Metacrylics Primer before any application. Do not stir the Gel. Usually, the Base and Acrylic Colors do not need to be stirred.

* Wash up completely with water, abrasive hand cleaner, or cold cream and a fibered wash cloth. Remove dried materials from hands and clothing as soon as possible.