G.A.P. Eagle True 2-40 Underlayment

The G.A.P. Eagle True 2-40 Underlayment is a felt underlayment for jobs that require G.A.P. model/MPN 8155 in the RL sell unit. Protect your residential or commercial project against moisture and heat damage with Eagle True 2-40.

Key Specs

• Brand: G.A.P.
• Model / MPN: 8155
• SKU: GAP8155
• Sell unit: RL
• Product type: Felt Underlayment
• Size / color: 2 Square/Roll
• Category: Residential Roofing | Residential Roofing/Underlayment | Residential Roofing/Underlayment/Felt Underlayment | Underlayment | Underlayment/Felt Underlayment
• Coverage / unit: 2 squares (200 sq ft) per roll

Key Features

• USA Made
• A true 2 square roll, even with the overlap
• Cost-effective and water resistant
• Manufactured to comply with ASTM D2626 – 04
• Great for concrete tile roof applications

Coverage & How Much You Need

This item is listed as 2 squares (200 sq ft) per roll. Use the project takeoff, manufacturer installation instructions, and expected waste/overlap to confirm the order quantity.

Compatibility / Fitment

Use this item only when the brand, model/MPN, size/color, sell unit, and system type match the project specification. Do not substitute it for a different felt underlayment, pack size, color, membrane/system family, or installation condition without checking the manufacturer instructions.

FAQs

What exactly am I ordering?

G.A.P. Eagle True 2-40 Underlayment, sold as RL, with SKU GAP8155 and manufacturer model/MPN 8155.

What model or part number should I match?

Match model/MPN 8155 and confirm the brand is G.A.P.. If the job spec lists a different model, size, color, or system family, hold for review.

What unit is the price based on?

This listing is built around the RL sell unit. Confirm the unit before comparing price, quantity, or coverage.

How do I estimate quantity?

Use 2 squares (200 sq ft) per roll, then add waste or overlap per the manufacturer instructions and the project design.

What should be checked before purchase?

Confirm the model/MPN, sell unit, size/color, jobsite condition, compatible system components, and any manufacturer installation limits before approving the order.

Roofing and exterior-envelope work can involve fall hazards, weather exposure, fumes, adhesives, and system-specific installation requirements; follow the manufacturer instructions, OSHA-safe work practices, and local code or use a qualified contractor.

Product Expert Notes

Choose this item when G.A.P. model/MPN 8155, SKU GAP8155, and the RL sell unit match the project requirement. It is best treated as an exact-match material selection, not a generic substitute.