The TopShield TS20 Synthetic Underlayment 10 Square/Roll is a synthetic underlayment for jobs that require TopShield model/MPN 1099431 in the RL sell unit. TopShield TS20 Synthetic Underlayment is a preferred choice for sloped roof applications over felt paper.

Key Specs

• Brand: TopShield
• Model / MPN: 1099431
• SKU: TOP1099431
• Sell unit: RL
• Product type: Synthetic Underlayment
• Size / color: 10 Square/Roll
• Category: Residential Roofing | Residential Roofing/Underlayment | Residential Roofing/Underlayment/Synthetic Underlayment | Underlayment | Underlayment/Synthetic Underlayment
• Coverage / unit: 10 squares (1000 sq ft) per roll

Key Features

• Meets ASTM 0226 Types I & II and 04869 Types II & IV
• Durable, slip-resistant walking surface
• 60 days UV exposure

Coverage & How Much You Need

This item is listed as 10 squares (1000 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 synthetic underlayment, pack size, color, membrane/system family, or installation condition without checking the manufacturer instructions.

FAQs

What exactly am I ordering?

TopShield TS20 Synthetic Underlayment 10 Square/Roll, sold as RL, with SKU TOP1099431 and manufacturer model/MPN 1099431.

What model or part number should I match?

Match model/MPN 1099431 and confirm the brand is TopShield. 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 10 squares (1000 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 TopShield model/MPN 1099431, SKU TOP1099431, and the RL sell unit match the project requirement. It is best treated as an exact-match material selection, not a generic substitute.