Installation Guide

Installation Instructions
Deck Preparation:
(A) AC Granular Ice and StormSeal
®
underlayment should be applied on roofs having slopes of 2 inches rise minimum in
12 inches run or greater.
(B) It can be applied on new construction or when reroofing, provided existing shingles have been removed. Remove all
old roofing down to the deck, or in new construction, apply over the new deck.
(C) Sweep the deck surface to remove dirt, dust, debris, and loose nails. The deck must be clean, smooth, frost free, and
dry for at least 24 hours before applying underlayment. Replace any damaged or rotted deck boards.
(D) No primer is necessary on a plywood deck. Oriented Strand Board (OSB) may require priming.
Eave Preparation:
(A) AC Granular Ice and StormSeal
®
underlayment should be applied over the metal drip edge at the eave, ensure metal
drip edge is nailed properly.
(B) Underlayment should be applied under the drip edge at the rake.
Installation:
(A) AC Granular Ice and StormSeal
®
underlayment should be applied when ambient and substrate temperatures are 40°F
(4.4°C) or higher. Do not leave exposed for more than 30 days.
(B) The underlayment should be applied in valleys before doing eave applications with underlayments. Along a roof valley,
underlayment can be installed as a liner. For maximum protection, the roll width should remain intact and extend 18 inches
on either side of the valley. Peel back the poly backer sheet and press underlayment into place working from the center of
the valley or ridge outward in each direction. Always apply valleys starting at the low point and work upwards. If an overlap
is needed be sure to overlap the previous piece by 6 inches (15.24cm). (See Figure 1)
(C) Unroll the underlayment and cut into 10 foot to 12 foot lengths. Allow to relax for 3 to 5 minutes before installing.
(See Figure 2)
(D) Along the eave edge, align the underlayment flush with the drip edge.. Fold the underlayment away from the edge onto
itself. Remove the lower half of the release sheet, starting at the middle of the underlayment to the edge. (See Figure 3)
Place the underlayment with the exposed rubberized asphalt onto the deck, pressing firmly into place.
(E) Fold the top half of the underlayment toward the roof edge over itself. Remove the release sheet and reposition the
underlayment pressing firmly into place. Repeat process as needed. (See Figure 4)
(F) On steep slope applications (over 6:12 pitch) or in high wind areas, back nail every 12 inches on center through the
selvedge edge and before applying additional courses. Use smooth shank galvanized roofing nails. Do not use staples.
(G) Repeat process as needed, overlapping additional courses 3 inches (7.6cm) on the selvedge edge. The laps must be
firmly hand rolled to insure a watertight bond. Overlap the end lap where the 2 rolls meet by 6 inches (15.2cm) and seal
with mastic. Stagger end laps a minimum of 24” from those in previous courses. (See Figure 5)
(H) Underlayment should extend from the eaves to a point 24 inches inside the exterior wall. Consult local building code
for specific requirements.
(I) Along the rake edge, overlap eave material a minimum of 6 inches (15.2cm). Align the underlayment flush with the drip
edge. Install per instructions above. Apply drip edge over underlayment after material is adhered.
(J) Cover underlayment with finish roofing material. Do not allow the underlayment to remain uncovered more than 30
days. Prolonged exposure to wind, sun and weather will adversely affect this product’s installation and performance.
Precautions:
(A) AC Granular Ice and StormSeal
®
underlayment should be installed by a professional roofing contractor. Underlayment
is designed to be covered by asphalt shingles, wood shakes and quarry slate roof assemblies. Protection from sunlight is
required to assure its long-term performance.
(B) This underlayment is a moisture and vapor barrier. Since ice build-up is partially a function of ventilation, the spaces
under the covered deck area and the attic space must be ventilated in accordance with local building codes.
(C) Underlayment is intended for exterior application only.
(D) Apply AC Granular Ice and StormSeal
®
underlayment directly to the deck. Do not apply felt underlayment beneath
AC Granular Ice and StormSeal
®
underlayment.
(E) Shingles should not be installed over wrinkled or buckled underlayment.
(F) Smooth shank galvanized nails are recommended for fastening shingles. Do not overdrive nails. Do not use staples.
(G) AC Granular Ice and StormSeal
®
underlayment must NOT be installed over uncured caulking, uncured sealants or
flexible vinyl. If the underlayment is installed over any of these materials, the adhesive will melt and run causing unsightly
streaks and drips. It is the installer’s responsibility to determine whether all the materials used are compatible with each
other. Contact the caulking or sealant manufacturer to ensure the product is compatible with asphalt. Caulking and
sealants must be fully cured before covering with AC Granular Ice and StormSeal
®
.
(H) Use extreme caution when installing underlayment. The underlayment surface is slippery even when dry. Use a fall
protection system when installing. Consult OSHA for Guidelines for Fall Protection (20 CFR 1926.500).
(I) For best results, apply underlayment when the air temperature is over 40°F (4.4°C) but below 90°F (32.2°C). When
temperatures are under 40°F underlayment will not fully adhere until warmer temperatures. Store at room temperatures
prior to installing product in cold weather. If applied in temperatures above 90°F (32.2°C), it may become difficult to
remove the release poly backing. If this situation should occur, move product into a shaded area until the underlayment is
cool. Once cooled, the release poly backing can be easily removed.
(J) Store underlayment in a dry, well ventilated area and stand upright. Do not store at 90°F (32.2°C) or warmer for
extended periods of time. Do not double stack the pallets. Provide cover on top and sides, allowing for adequate
ventilation. When applying underlayment, always follow local building codes and the shingle manufacturer’s
instructions for installation of its product.
Information:
If you have questions about this product contact NEI at 800-998-4634 or 61 Pine Road, Brentwood, NH 03833.
Read and understand all instructions and precautions before applying AC Granular Ice and StormSeal
®
Granular Surfaced Self Adhesive Underlayment.
Figure 2
Figure 1
Valley center lineValley center line
18”either side of valley18”either side of valley18”either side of valley
18 pulg. a ambos lados
de la limahoya
18 pulg. a ambos lados
de la limahoya
18”either side of valley18”either side of valley18”either side of valley
18 pulg. a ambos lados
de la limahoya
18 pulg. a ambos lados
de la limahoya
6” overlap6” overlap6” overlap
Superposición de 6 pulg.Superposición de 6 pulg.
Release SheetRelease Sheet
Valley center line
Línea central de
la limahoya
Línea central de
la limahoya
Release Sheet
Hoja antiadherenteHoja antiadherente
18 pulg. a ambos lados
de la limahoya
18 pulg. a ambos lados
de la limahoya
Superposición de 6 pulg.
Línea central de
la limahoya
Hoja antiadherente
Figure 3
Release Sheet
Hoja antiadherenteHoja antiadherente
6” overlap6” overlap6” overlap
Superposición de 6 pulg.Superposición de 6 pulg.
Hoja antiadherente
Superposición de 6 pulg.
Figure 4
Release SheetRelease SheetRelease Sheet
Hoja antiadherenteHoja antiadherente
Hoja antiadherente
Figure 5
Figura 2
Figura 1
Figura 3
Figura 4
Figura 5
6” overlap6” overlap
Superposición de 6 pulg.Superposición de 6 pulg.
3” edge lap3” edge lap
superposición del
borde de 3 pulg.
superposición del
borde de 3 pulg.
24” end lap24” end lap
Empalme de 24 pulg.Empalme de 24 pulg.
6” overlap
Superposición de 6 pulg.
3” edge lap
superposición del
borde de 3 pulg.
24” end lap
Empalme de 24 pulg.