Installation Guide

the membrane is necessary on steep slopes during hot
or extreme cold weather, backnail and cover the nails
by overlapping with the next sheet.
Extend the membrane on the roof deck above the
highest expected level of water back-up from ice
dams and above the highest expected level of snow
and ice on the wall sheathing on vertical side walls
(dormers) and vertical front walls for ice dam protec-
tion. Consider a double layer of membrane in critical
areas, such as along the eaves or in valleys and in
climates where severe ice dams are anticipated. Apply
the membrane to the entire roof deck for wind-driven
rain protection. Apply a new layer of Grace Select
™
membrane directly over the old Grace underlayment
(except for Grace BASIK
®
, Tri-Flex
®
, or SYN 15
™
) in
retrot applications following the standard membrane
application procedure.
Precautions & Limitations
• Slippery when wet or covered by frost.
• Consistent with good roong practice, always wear
fall protection when working on a roof deck.
• Release liners are slippery. Remove from work area
immediately after membrane application.
• Do not leave permanently exposed to sunlight.
Maximum recommended exposure is 30 days.
• Place metal drip edges or wood starter shingles over
the membrane.
• Do not fold over the roof edge unless the edge is
protected by a drip edge, gutter, or other ashing
material.
• Do not install on chamfered edges of wood plank.
• Do not install directly on old roof coverings.
For more information, refer to Technical Letter 5,
Chemical Compatibility.
• Provide proper roof insulation and ventilation to
help reduce ice dams and to minimize condensation.
Grace Select is an air and vapor barrier.
• Repair holes, shmouths, tears, and damage with
a round patch of membrane extending past the
damaged area 6 in. (150 mm) in all directions.
If fasteners are removed leaving holes in the
membrane, they must be patched. The membrane
may not self-seal open fastener penetrations.
• Do not install fasteners through the membrane over
unsupported areas of the structural deck, such as over
the joints between adjacent structural panels.
• Due to its slight asphaltic odor, do not apply where
the membrane is exposed to interior living areas.
• Refer to product literature for more complete product
information.
• Not recommended for roong in high altitudes and
alpine regions.
• Not compatible with EPDM or TPO; use Grace
Ultra
™
underlayment for tie-ins (refer to Technical
Letter 5).
• Not compatible with polysuldes, exible PVC, or
high concentrations of resin (pitch). For more infor-
mation, refer to Technical Letter 5.
Standard Compliance
Grace Select meets the following standards:
• ICC ESR-1677 approval under AC-48 Acceptance
Criteria for Self-Adhered Underlayments to be used
as an Ice Barrier
• Underwriters Laboratories, Inc. Class A re classi-
cation under berglass shingles and Class C under
organic felt shingles (per ASTM E108/UL 790).
Use Grace Select
™
membrane on all of these
critical areas
Conned
Rake Edge
Rake Edge
Eave
Low Slope Area
Chimney
Skylight
Valley
Eave
Ridge
Hip
Dormer
Corners
Flanged Windows
Sill
Exterior
Doors
Sill Plate
Ledger Board
Deck Joists
Grace Select™ roofing underlayment
Grace Vycor® Plus Flashing
Grace Vycor Deck Protector® Flashing