Installation Guide

Grace Construction Products
GRACE SYN 15
™
Synthetic Replacement for #15 Felt
Product Advantages vs. #15 Felt
• Stronger
• More slip resistant
• Better Coverage per roll, greater productiv-
ity
• Suitable for use under all major
roof coverings
• 10 Year Warranty
Grace SYN 15
™
synthetic underlayment exceeds
the requirements of ASTM D226 and offers the
benets of a synthetic to traditional #15 felt users.
Its higher coverage per roll means it goes down
quickly. Because it is 10x stronger than #15
felt, costly blow offs are prevented. The product
is mechanically fastened, and may be used in
conjunction with GRACE self adhered underlay-
ments, or alone.
It is totally recyclable, and contains post industrial
recycled polymers, so it contributes to sustain-
abiliy and LEED.
Grace SYN 15
™
underlayment acts as a second-
ary watershedding material below mechanically
attached roof coverings. The product may be
exposed for up to 30 days, and may be used with
asphalt shingles and most other roof coverings.
Product Description
Grace SYN 15
™
underlayment is an engineered
woven fabric, coated on both sides with polypro-
pylene. The proprietary resin formula used in the
walk and deckside surfaces create a slip resistant
surface.
Grace SYN 15
™
underlayment is available in 10 sq
rolls (48 in. wide x 250 ft long).
Features & Benets
Major benets of Grace SYN 15
™
underlayment
vs #15 felt include:
Stronger—Its 10x stronger and prevents blow offs
and tears in windy conditions
Higher Coverage per Roll—A 10 sq roll is 67%
lighter than #15 felt, and covers 2.3 times the area
Fewer Laps and Fasteners—30% more coverage
per side lap than felt
Sustainable—Grace SYN 15
™
underlayment
is 100% recyclable, and contains post industrial
recycled materials, and contributes to sustainabil-
ity and LEED
Excellent temporary dry in—May be exposed
for up to 30 days