SOPREMA ALSAN Flashing Polyurethane Waterproofing Coating, Black, 1 gal or 5 gal - image 1

SOPREMA ALSAN Flashing Polyurethane Waterproofing Coating, Black, 1 gal or 5 gal

Regular price $415.00

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SOPREMA ALSAN Flashing Polyurethane Waterproofing Coating, Black, 1 gal or 5 gal


Soprema ALSAN Flashing is a patented single-component, polyurethane- and bitumen-based waterproofing coating for hard-to-access upstands and roof details where sheet membranes are difficult to apply. It is available in 1 gallon and 5 gallon pails of black liquid coating and applies with rollers, brushes, or squeegees.


Key Features:

  • Detail waterproofing: Waterproofs hard-to-access upstands and other details where sheet waterproofing membranes are difficult to apply.
  • Moisture protection: Provides superior protection against moisture.
  • Single component: Single-component, polyurethane- and bitumen-based coating with no mixing required.
  • Easy application: Easy to apply, which reduces the cost of labor.
  • Flexible application tools: Applied with rollers, brushes, and squeegees.
  • Two sizes: Offered in 1 gallon and 5 gallon pails.

Specifications Table:

Specification Details
Brand Soprema
Sell unit 1 pail (1 gal or 5 gal)
Product line Soprema ALSAN Flashing
Available colors ['Black']
Available sizes ['1 gal', '5 gal']
Material Polyurethane- and bitumen-based coating
Color / finish Black
Intended use Liquid-applied waterproofing for upstands and roof details in place of sheet membrane

Fit and Compatibility:

Used for ALSAN liquid-applied waterproofing details and upstands where sheet waterproofing membranes are impractical. Pair with the membrane system and reinforcement specified by the roof system design; sold separately.


Frequently Asked Questions (FAQ):

Q: What sizes does ALSAN Flashing come in?
A: It is available in 1 gallon and 5 gallon pails, both black.


Q: Where is this product used?
A: It waterproofs hard-to-access upstands and other details where applying sheet waterproofing membranes is difficult.


Q: How is it applied?
A: It is applied with rollers, brushes, or squeegees as a single-component coating.


Q: Does it need mixing?
A: No, it is a patented single-component coating.


Q: What is it made of?
A: It is a polyurethane- and bitumen-based waterproofing coating.


Expert Verdict — Reviewed by the SuperArbor Pro Desk

ALSAN Flashing is ideal for flashing details, upstands, and irregular penetrations where cutting and sealing sheet membrane is slow or impractical. Its single-component formula keeps labor down, but proper substrate prep and the system's specified reinforcement and thickness are still essential for a watertight detail. Keep a 1 gallon pail on the truck for repairs and use the 5 gallon pail for larger projects.

Follow the manufacturer's application and safety instructions for liquid-applied waterproofing products, including ventilation and personal protective equipment.


Get Soprema ALSAN Flashing for fast, reliable waterproofing on your toughest roof details.

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All orders are reviewed before fulfillment. You are not charged until your order is approved and ready to ship — and you may cancel at any time before that at no cost.

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