CertainTeed WinterGuard PRO HT Waterproofing Underlayment 3′ x 66′ 7-1/4″

The CertainTeed WinterGuard PRO HT Waterproofing Underlayment 3′ x 66′ 7-1/4″ is a ice & water underlayment for jobs that require CertainTeed model/MPN 660887 in the RL sell unit. The WinterGuard PRO water-proofing shingle underlayment is applied under roof shingles during new construction or re-roofing to protect your homes interior from water leaks caused by ice dams and wind-driven rain.

Key Specs

• Brand: CertainTeed
• Model / MPN: 660887
• SKU: CER660887
• Sell unit: RL
• Product type: Ice & Water Underlayment
• Size / color: 3′ x 66′ 7-1/4″
• 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

• WinterGuard PRO can be repositioned before deck adhesion occurs
• WinterGuard PRO must be applied to a clean, dry, bare deck never over shingles

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?

CertainTeed WinterGuard PRO HT Waterproofing Underlayment 3′ x 66′ 7-1/4″, sold as RL, with SKU CER660887 and manufacturer model/MPN 660887.

What model or part number should I match?

Match model/MPN 660887 and confirm the brand is CertainTeed. 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 CertainTeed model/MPN 660887, SKU CER660887, and the RL sell unit match the project requirement. It is best treated as an exact-match material selection, not a generic substitute.