The G.A.P. 15# D4869 is a felt underlayment for jobs that require G.A.P. model/MPN 015-N-GAP in the RL sell unit. G 15 Felt is an underlayment is applied over the roofing deck before installation of asphalt shingles.

Key Specs

• Brand: G.A.P.
• Model / MPN: 015-N-GAP
• SKU: GAPF154869
• Sell unit: RL
• Product type: Felt Underlayment
• Size / color: 4 Square/Roll ASTM D4869
• Category: Residential Roofing | Residential Roofing/Underlayment | Residential Roofing/Underlayment/Felt Underlayment | Underlayment | Underlayment/Felt Underlayment
• Coverage / unit: 4 squares (400 sq ft) per roll

Key Features

• Verify the exact model, size, color, sell unit, and system requirements before ordering.

Coverage & How Much You Need

This item is listed as 4 squares (400 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. 15# D4869, sold as RL, with SKU GAPF154869 and manufacturer model/MPN 015-N-GAP.

What model or part number should I match?

Match model/MPN 015-N-GAP 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 4 squares (400 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 015-N-GAP, SKU GAPF154869, and the RL sell unit match the project requirement. It is best treated as an exact-match material selection, not a generic substitute.