Frequently Asked Questions - General

Yes. Our Material Safety Data Sheet is located under the Technical Bulletins section of our document library.

Visit our Scotchgard page to find out more about Scotchgard.

Visit our Where to Buy page to search for distributors within your area.

Stay connected by visiting our site regularly, and be sure to like our Facebook page: PABCO Roofing Products, for frequent tips, announcements, and other news.

Refer to the Find A Contractor page on our website where you can locate local contractors within your area.

To prevent harmful condensation, air must circulate freely under the roof deck.  A minimum of 1 ft2 of total net free ventilating area is required for each 150 ft2 of ceiling area, or 1 ft2 for each 300 ft2 of ceiling area if (A) a vapor barrier is installed on the warm side of the ceiling or (B) approximately 1/2 the ventilation is provided near the ridge.

Shingle roof systems which do not have free air circulation under the roof deck (or if they have less venting area than directed above) have reduced coverage under the terms of the PABCO® Limited Shingle Warranty.

See the PABCO® Limited Shingle Warranty for additional details.

See the PABCO® Directions For Application for additional details and related information.

Do I need attic ventilation?

In most areas, the building code allows application over boards.  You need to confirm if this is allowed in your area.

When applying shingles over boards, PABCO® directs the use of well-seasoned wood boards 1" minimum nominal thickness, 6" maximum width.

See the PABCO® Directions For Application for additional details and related information.

Can I apply shingles over board decks instead of plywood?

The black stain that grows and spreads on a roof is typically algae.  PABCO® recommends cleaning algae from your roof by killing it with an application of a 50:50 mix of liquid chlorine bleach and water.  This is sprayed onto the surface of the algae with a low pressure sprayer, like a garden weed sprayer.  Allow the solution to dwell on the surface (15 to 20 minutes) and then rinse thoroughly with low pressure water.  

Do not use abrasive cleaning methods such as pressure washing or the use of a brush or broom.

See the PABCO® Technical Bulletin on Recommended Maintenance Practices for additional details and related information.  For more information on algae resistant shingles, check out the Scothchgard™ Protector page.

How do I clean the black stain off my roof?

PABCO® recommends cleaning moss from your roof by killing the moss with an application of a 50:50 mix of liquid chlorine bleach and water.  This is sprayed onto the surface of the moss with a low pressure sprayer, like a garden weed sprayer.  Allow the solution to dwell on the surface (15 to 20 minutes) and then rinse thoroughly with low pressure water.  Extended dwell times may be necessary to kill the moss, however avoid letting the solution dry completely as this may prevent complete rinsing.  After the moss is dead, it will weather off.

Do not use abrasive cleaning methods such as pressure washing or the use of a brush or broom.

See the PABCO® Technical Bulletin on Recommended Maintenance Practices for additional details and related information.

How do I clean the Moss off my roof?