
How to Install STINGER EXO Roofing Underlayment: A Contractor's Guide
STINGER is committed to redefining roofing standards with innovative solutions that deliver exceptional performance. Our EXO synthetic underlayment is engineered for unparalleled protection against water infiltration, backed by rigorous testing and approval for wind speeds up to 180 mph. This guide will walk you through the installation process, ensuring your project meets the highest standards, too.
Pre-Installation
STINGER EXO underlayment can be installed on roofs with a minimum slope of 2:12 or the minimum slope required for the roof covering material, whichever is greater.
For a successful installation, start by inspecting your roof deck. Make sure it’s clean, smooth, and dry before beginning. Sweep away any dirt or debris.
You may want to use safely secured roof jacks, toe boards, or a storage platform for stability and safety when handling materials, depending on the roof pitch and surface conditions.
Installation
Laying STINGER EXO Underlayment
Start by unrolling the EXO underlayment parallel to the eave with the printed side facing up. Designed with contractors in mind, EXO features pre-printed overlap lines for efficient and accurate installation. Follow these guidelines:
- Overlap the sides by 3 inches (7.6cm) and end by 6 inches (15.2cm).
- On roof slopes less than 4:12, overlap the underlayment at 22 inches (61cm) or to the bottom center overlap line as printed, over the underlying course.
Fastener Selection
When attaching EXO underlayment to the roof, rely on these fastener options from STINGER:
- STINGER NailPac: 1” x 0.083” electro-galvanized ring shank collated nails with 1” diameter plastic caps. Speed up your installation with the pneumatic CN100B Cap Nailer with a fastener capacity of 200 and a speed of five cap nails per second.
- STINGER StaplePac: 7/8”, 1-1/4”, or 1-1/2” galvanized 7/16” crown no. 18 gauge collated staples with 1” diameter plastic caps. For proven performance and fewer reloads, reach for the large capacity, ergonomic CS150B Cap Stapler.
- STINGER Hand Drive: 1” x 0.105 electro-galvanized ring shank nails with 1” diameter plastic caps
Fastener Spacing
STINGER EXO underlayment includes pre-printed fastener patterns for both normal and high wind conditions to streamline your installation and deliver maximum performance.
In standard conditions,
- Fasten your underlayment at 12 inches (30.5cm) on center at both horizontal and vertical laps for water resistance and protection.
- Fasten at 24 in. (61cm) on center along the center of the roll in the field (along the middle section of the underlayment roll as it lies on the roof). This provides sufficient hold for the underlayment without excessive penetration of the roof deck.
In high wind zones and coastal areas,
- Decrease the fastener spacing to 6 inches (10.1cm) on center at both horizontal and vertical laps. Attach the fasteners in a 12-inch (30.5 cm) grid pattern in the field to provide greater hold in challenging weather conditions.
Seams and Joints
Where seams and joints require the use of sealants or adhesives to prevent water infiltration, use a high quality, low solvent, asbestos-free, ASTM D-4586 Type I compliant roofing cement, and consult the manufacturer’s instructions.
Roof Penetrations and Drains
Special attention is required around roof penetrations and drains. Here are some general recommendations:
- Install the underlayment up to the base of the drain flange.
- Cut the underlayment around the drain flange, leaving a hole slightly larger than the drain pipe.
- Fold the cut edges of the underlayment up the side of the drain flange.
- Use a compatible flashing material and sealant to create a watertight seal around the drain.
Code Requirements
Always observe safe roofing practices and comply with all applicable building codes for underlayment application and attachment. Note that in Florida, underlayment installation must adhere to the provisions of Sections 1507 and 1518 of the Florida Building Code (FBC).
Additional Tips and Best Practices
- Use a sharp utility knife to cut the underlayment.
- Wear proper safety gear, including gloves, eye protection, and slip-resistant shoes, when installing the underlayment.
- Install the final roof covering within six months.
- Store leftover rolls of underlayment in a cool, dry place out of direct sunlight.
With STINGER EXO, you're not just installing an underlayment; you're laying down the foundation for a roof that stands the test of time, weather, and performance standards. Experience the difference of roofs built to last with STINGER EXO.