Installation Guide

ManualsBrandsGrace ManualsBuilding materialsTri-Flex 48 in. x 250 ft. Roll Synthetic Roofing Underlayment

Grace Construction Products

GRACE TRI-FLEX

High performance rooﬁng underlayment

Product Advantages

• Lighter and covers more area

• Stronger

• More durable

• Slip resistant under wet conditions

• Suitable for use under all major roof coverings

• Facilitates faster and easier

installation

• 25 Year Warranty

Grace Tri-Flex

mechanically-attached roong

underlayment is a high performance water-shedding

underlayment, designed to overcome the shortcomings

of traditional roong felt. It is stronger than #30 felt

and withstands high wind conditions; it is lighter than

#30 felt and covers more area. The product is mechani-

cally attached to the roof and can be used alone or in

conjunction with Grace self-adhered underlayments.

Grace roong underlayment provides a stable base for

the application of mechanically-attached roof coverings

and serves as a secondary water shed to help prevent

leaks if water penetrates the primary roof covering. The

product may also be used to temporarily “dry in” the

structure for a period of 6 months before the roof

construction is nished or if the primary roof coverings

become damaged.

Grace underlayment is suitable for application as part

of all major roof systems.

Product Description

Grace underlayment is a high strength woven synthetic

roong underlayment coated with a layer of UV stabi-

lized polyolen. This composition creates a tough,

weather-resistant membrane that has been proven under

some of the harshest conditions in North America.

Grace Tri-Flex

roong underlayment is available in

10 sq rolls (48 in. wide x 250 ft long).

Features & Benets

Below are some of the major benets of Grace roong

underlayment compared to conventional #30 roong

felt:

It’s lighter and covers more area—A roll of under-

layment is around half the weight of #30 felt, and has

nearly 5 times the coverage.

It’s stronger—Grace Tri-Flex

roong underlayment

is 20 times stronger than felt and won’t tear away from

nails even in high winds.

It’s more durable—Grace underlayment can be left

Summary of content (4 pages)

PAGE 1
Grace Construction Products GRACE TRI-FLEX High performance roofing underlayment ® Grace Tri-Flex® mechanically-attached roofing underlayment is a high performance water-shedding underlayment, designed to overcome the shortcomings of traditional roofing felt. It is stronger than #30 felt and withstands high wind conditions; it is lighter than #30 felt and covers more area. The product is mechanically attached to the roof and can be used alone or in conjunction with Grace self-adhered underlayments.
PAGE 2
exposed for up to 6 months. It doesn’t dry out or rot at high temperatures. It doesn’t crack or become brittle at low temperatures. It’s slip resistant—Grace roofing underlayment is formulated for excellent skid-resistance even in wet conditions. Suitable for use under all major roof coverings—Grace Tri-Flex® mechanically-attached underlayment can be used under shingles, tiles, slate, metal and cedar shakes. Refer to subsequent sections for more details.
PAGE 3
Product Data Roll length Roll width Roll size Roll weight Rolls per pallet 10 sq Roll 250 ft (76.2 m) 48 in (1.05 m) 1,000 ft2 (92.9 m2) 28 lbs (12.
PAGE 4
• Do not fold over the roof edge unless the edge is protected by a drip edge, gutter or other flashing material. • Repair holes, fishmouths, tears and damage to product. Grace mechanically-attached underlayment does not self-seal open fastener penetrations. • Check with the manufacturer of the metal roofing system for any special requirements when used under metal roofing. Do not install directly under roof coverings especially sensitive to corrosion, such as zinc, without providing proper ventilation.