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

<p>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.</p><h3>Key Specs</h3><ul><li><strong>Brand:</strong> CertainTeed</li><li><strong>Model / MPN:</strong> 660887</li><li><strong>SKU:</strong> CER660887</li><li><strong>Sell unit:</strong> RL</li><li><strong>Product type:</strong> Ice & Water Underlayment</li><li><strong>Size / color:</strong> 3' x 66' 7-1/4"</li><li><strong>Category:</strong> Residential Roofing | Residential Roofing/Underlayment | Residential Roofing/Underlayment/Ice & Water Underlayment | Underlayment | Underlayment/Ice & Water Underlayment</li><li><strong>Coverage / unit:</strong> 2 squares (200 sq ft) per roll</li></ul><h3>Key Features</h3><ul><li>WinterGuard PRO can be repositioned before deck adhesion occurs</li><li>WinterGuard PRO must be applied to a clean, dry, bare deck never over shingles</li></ul><h3>Coverage & How Much You Need</h3><p>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.</p><h3>Compatibility / Fitment</h3><p>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.</p><h3>FAQs</h3><h4>What exactly am I ordering?</h4><p>CertainTeed WinterGuard PRO HT Waterproofing Underlayment 3' x 66' 7-1/4", sold as RL, with SKU CER660887 and manufacturer model/MPN 660887.</p><h4>What model or part number should I match?</h4><p>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.</p><h4>What unit is the price based on?</h4><p>This listing is built around the RL sell unit. Confirm the unit before comparing price, quantity, or coverage.</p><h4>How do I estimate quantity?</h4><p>Use 2 squares (200 sq ft) per roll, then add waste or overlap per the manufacturer instructions and the project design.</p><h4>What should be checked before purchase?</h4><p>Confirm the model/MPN, sell unit, size/color, jobsite condition, compatible system components, and any manufacturer installation limits before approving the order.</p><p><em>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.</em></p><h3>Product Expert Notes</h3><p>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.</p>