G.A.P. WaterGuard Rain & Ice Underlayment

The G.A.P. WaterGuard Rain & Ice Underlayment is a ice & water underlayment for jobs that require G.A.P. model/MPN 030-RAIN&ICE40 in the RL sell unit. WaterGuard?

Key Specs

• Brand: G.A.P.
• Model / MPN: 030-RAIN&ICE40
• SKU: GAP030RAINICE40
• Sell unit: RL
• Product type: Ice & Water Underlayment
• Size / color: 2 Square/Roll
• Category: Residential Roofing | Residential Roofing/Underlayment | Residential Roofing/Underlayment/Ice & Water Underlayment | Underlayment | Underlayment/Ice & Water Underlayment
• Coverage / unit: 2 squares (200 sq ft) per roll

Key Features

• Ideal for low-slope applications (2″ to 4″ per 12″) that demand complete roof coverage and protection, particularly along the eaves.
• G.A.P. WaterGuard Rain & Ice Protection is manufactured on a woven fiberglass mat with a SBS polymer-modified asphalt top coating and surfaced with a sand release agent.
• For use on steep slopes and as a flashing membrane in areas susceptible to leaks, such as valleys, roof-to-wall transitions, and around vents, curbs, skylights and other roof penetrations.

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 ice & water underlayment, pack size, color, membrane/system family, or installation condition without checking the manufacturer instructions.

FAQs

What exactly am I ordering?

G.A.P. WaterGuard Rain & Ice Underlayment, sold as RL, with SKU GAP030RAINICE40 and manufacturer model/MPN 030-RAIN&ICE40.

What model or part number should I match?

Match model/MPN 030-RAIN&ICE40 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 030-RAIN&ICE40, SKU GAP030RAINICE40, and the RL sell unit match the project requirement. It is best treated as an exact-match material selection, not a generic substitute.