GreenGuard Synthetic Roofing Underlayment User Manual
GreenGuard® Synthetic Roong Underlayment Installation Guide
General Information
Installation of GreenGuard® Synthetic Roong Underlayment shall be in accordance with applicable building codes and this
Installation Guide. The Installation Guide shall be available at the jobsite during installation.
GreenGuard® Synthetic Roong Underlayment is intended for use on new construction, sloped residential roofs (2:12
pitch or greater) or for retrot applications, where the existing roof covering has been removed and the underlayment
can be installed directly over the existing roof deck. The GreenGuard® Synthetic Roong Underlayment can be used as
underlayment installed under asphalt roof shingles, concrete or clay roof tiles, metal roof panels or wood roof shakes.
Damaged roof sheathing shall be replaced prior to installation of the GreenGuard® Synthetic Roong Underlayment.
Safety Precautions
• Review this Installation Guide prior to beginning installation. Refer to the Material Safety Data Sheet for additional
information. Go to www.green-guard.com for the most current product information.
• CAUTION: Roof underlayments may be slippery when wet or covered with mud, dust, frost, ice, snow, etc. OSHA and other
applicable requlations for roof work shall be followed. Always use an approved fall protection system when working on roofs.
• CAUTION: Like most building materials, roof underlayments are combustible and may ignite if exposed to re of sufcient
heat and intensity. Protect roof underlayments from exposure to open ame or other ignition sources during shipping,
storage and installation.
• Installation shall comply with OSHA and other applicable regulations for roof work.
• Always use an approved fall protection system when working on roofs.
• Use roof jacks with planks, toe boards or storage platforms secured to the substrate to prevent slippage of stored materials.
• Stay away from power lines and avoid body and equipment contact.
• On steep pitch surfaces, roof jacks with planks should be used for standing.
• Follow all ladder safety standards and regulations.
• Never leave scraps, wrappers or other debris on the roof surface.
• Dispose of waste materials in accordance with applicable local regulations.
1. Preparation
A. The roof deck shall be dry, free from dust, dirt, loose debris and obstructions.
B. At the time of installation, the ambient air temperature shall be above 40° F.
2. Installation – Roong Underlayment
A. Begin by unrolling several feet of the underlayment parallel with the eaves along the lower edge of the roof, with the
print side up.
B. The rst course shall overlap the drip edge eave ashing and shall go under the drip edge at the rake.
C. If the underlayment becomes misaligned, the roll shall be cut and restarted, overlapping the ends a minimum of 6 inches.
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GreenGuard® Synthetic Roong Underlayment Installation Guide
2. Installation – Roong Underlayment (cont.)
D. Around the perimeter of the underlayment, place
roong nails or roong nails with a 1 inch plastic cap
approximately 6 inches apart and about 1 inch from
the edge. If the roof covering is to immediately follow
installation of the underlayment, then No. 16 gauge
staples with a minimum 7/16 inch crown may be used.
The fasteners must be long enough to penetrate through
the thickness of the roof deck. If battens are to be
installed over the underlayment, then the underlayment
need only be preliminarily attached pending attachment
of the battens or counterbattens.
E. In the main area of the underlayment, two rows of nails
are used, with the rst row placed 12 inches up from the
bottom edge and the second row placed 12 inches down
from the upper edge (the spacing between the two rows is
24 inches). The rows of nails shall be offset so that the nail
in one row is opposite the open area on the second row.
F. Install additional courses of underlayment by overlapping
all horizontal joints a minimum of 4 inches and vertical
joints a minimum of 6 inches. All vertical joints shall
be located at least 6 – 8 inches from vertical joints in
adjacent courses so that joints are staggered.
Figure 1: Installation of Roong Underlayment
3. Installation - High Wind Zone/Coastal Areas
A. In high wind zone or coastal areas, the underlayment
shall be installed in accordance with the applicable local
building code. In these areas, decrease the nail spacing
to 4 inches apart on both head and end laps and 12
inches apart in the eld areas.
B. In areas with wind speeds in excess of 90 miles per hour,
or wind speeds in excess of 110 miles per hour, the roof
underlayment shall be installed in accordance with Section
1507.2.8.1 of the IBC and Section R905.3.3.3 of the IRC.
4. Installation – Hurricane Zones
A. Considered High-Velocity Hurricane Zones (HVHZ) - the
underlayment shall be installed in accordance with
Section 1518.2 of the Florida Building Code.
5. Installation – Ice Barriers
A. For roofs required to have an ice barrier in accordance
with local building codes, use a self-adhering membrane
complying with ASTM D 1970 or ICC-ES Acceptance
Criteria AC148. The ice barrier shall be installed prior
installation of the roof underlayment so that the roof
underlayment overlaps the ice barrier. See Figure 2.
Figure 2: Installation of Ice Barrier Membranes
1-800-241-4402 www.green-guard.com
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