Full Product Manual

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
protection. 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 proce-
dure.
Precautions & Limitations
• Slippery when wet or covered by frost.
• Consistent with good roong practice, always wear fall protec-
tion when working on a roof deck.
• Release liners are slippery. Remove from work area immedi-
ately 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 unsup-
ported 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 informa-
tion.
• Not recommended for roong in high altitudes and alpine
regions.
• Not compatible with EPDM or TPO; use Grace Ultra
™
under-
layment for tie-ins (refer to Technical Letter 5).
• Not compatible with polysuldes, exible PVC, or high
concentrations of resin (pitch). For more information, 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 shin-
gles (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
49