TAMKO TW Metal and Tile Self-Adhering Underlayment – 39-3/8 in. x 61 ft., 2 SQ Roll

This is TAMKO TW Metal and Tile Underlayment, a fiberglass-reinforced, self-adhering SBS modified asphalt sheet membrane in black, 39-3/8 in. x 61 ft. per roll. Each 2-square roll provides 200 sq ft of coverage and gives secondary water protection under metal, tile and other steep-slope roof coverings.

Key Features:

• Self-adhering membrane: A self-adhering SBS modified asphalt sheet with a treated release film on the adhesive side.
• Fiberglass reinforced: Fiberglass mat construction adds dimensional stability.
• 2 squares per roll: Each roll covers 200 sq ft (39-3/8 in. x 61 ft.).
• Broad adhesion: Adheres to concrete, gypsum sheathing, plywood, OSB, DensGlass, polyiso and metal surfaces.
• Code listed: UL Classified; ICC-ES ESR-1252; Miami-Dade NOA 17-0531.01; Florida Building Code FL 12328; ASTM D1970.
• Limited warranty: Backed by a 5-year limited warranty.
• Polymer surface film: Polymer surface film over SBS modified asphalt.

Specifications Table:

Coverage & How Much You Need:

One roll covers 200 sq ft (2 squares) at full application, 39-3/8 in. wide by 61 ft. long. Deduct laps and head-end overlaps when estimating; order rolls based on deck area divided by 2 squares per roll, with waste.

Fit and Compatibility:

Intended for use under TAMKO metal and tile roof systems and compatible steep-slope coverings; bonds to cast-in-place and pre-cast concrete, exterior gypsum sheathing, plywood, OSB, DensGlass, felt- or foil-faced polyiso and metal substrates as listed. Primers and metal or tile roofing are sold separately.

Frequently Asked Questions (FAQ):

Q: How much does one roll cover?
A: One roll covers 200 sq ft (2 squares), 39-3/8 in. x 61 ft.

Q: What surfaces can it adhere to?
A: Cast-in-place or pre-cast concrete, exterior gypsum sheathing, plywood, OSB, DensGlass, felt- or foil-faced polyiso and metal surfaces.

Q: Is it self-adhering?
A: Yes, it is a self-adhering SBS modified asphalt membrane with a treated release film.

Q: What approvals does it have?
A: UL Classified, ICC-ES ESR-1252, Miami-Dade NOA 17-0531.01, Florida Building Code FL 12328 and ASTM D1970.

Q: What warranty applies?
A: A 5-year limited warranty per the listed specification.

Q: How much does a roll weigh?
A: The listed item weight is 69 lb.

Expert Verdict Reviewed by the SuperArbor Pro Desk

Self-adhering membranes like TW are the right call under metal and tile where ice, wind-driven rain or high-end assemblies demand a sealed deck. Apply only to clean, dry, primed-if-required substrates within the temperature window on the product instructions, and roll laps firmly. At 2 squares per roll it estimates easily, but remember metal and tile systems often specify full coverage rather than eave-only application.

Self-adhered membranes are heavy and slippery underfoot; keep release films clear of walking surfaces and follow the manufacturer’s installation instructions, roof system details and local code.

Order the TAMKO TW Metal and Tile Underlayment 2-square roll for a fully adhered secondary water barrier.