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Parapro® Roof Membrane & Flashing

PMMA liquid-applied products
Parapro® Flashing & Roof Membrane brochure

Siplast Parapro® Roof Membrane and Flashing products provide PMMA waterproofing protection that lasts, with quick cure times, so project schedules stay on track and buildings can return to service quicker. Ideal for roofing jobs with difficult access, tight clearances, or odd-shaped penetrations. Parapro® resins offer protection against inclement weather conditions, foot traffic,* and UV exposure, and suitable for areas where flame-free application is required or where water doesn’t drain quickly or completely. The finished application is fully reinforced and seamless.

PMMA performance advantages of Parapro®

Parapro® PMMA solutions offer an ultra-fast cure time—rain-ready in 30 minutes and ready for foot traffic in two hours†—and can be applied in a wide range of temperatures—from 23°F to 104°F—to minimize jobsite delays and help keep projects on schedule. With exceptional durability, they resist the natural wear and tear associated with moisture, and heat and cold-driven expansion and contraction. Parapro® resins are also low VOC, and unlike many polyurethane materials, are formulated without solvents and isocyanates. Resistant to many chemicals‡ and environmental contaminants, Parapro® is ideal for areas requiring protection against many conditions and substances that can negatively affect more traditional roofing products, including:

* Siplast warranties and guarantees do not provide coverage against foot traffic. Refer to siplast.com for more information on warranty and guarantee coverage and restrictions.

† Typical set/cure time at 68ºF (20ºC).

‡ Siplast warranties and guarantees do not provide coverage against exposure to chemicals, including animal fats or vegetable oils. Refer to siplast.com for more information on warranty and guarantee coverage and restrictions.

Siplast Paradiene 20/30 System cutaway diagram with Parapro Flashing detail.

Paradiene® 20/30 System with Parapro® Flashing

Siplast Paradiene® 20/30 System is renowned for its exceptional durability, and when integrated with Siplast Parapro® Flashing it delivers robust waterproofing designed for roofs with unusual or complex penetrations. From I-beams and H-beams to stanchions and equipment supports, complicated details are sealed seamlessly. Parapro® Flashing is liquid applied directly over the Paradiene® 30 finish ply with a base and top coat of catalyzed, thixotropic PMMA resin encapsulating a layer of high-strength polyester fleece.
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Siplast Parapro Roof Membrane System cutaway diagram showing seamless layers.

Parapro Roof Membrane System

The Parapro® Roof Membrane System is a seamless, fully reinforced, layered application consisting of a substrate-specific primer and a waterproofing membrane combining two resin waterproofing coats and polyester fleece fabric. The system forms a seamless, 90 mil monolithic membrane that supports fast installation on complex geometries and multiple penetrations, and offers greater inter-layer bond strength and durability against dynamic/static loads vs. polyester and polyurethane products.
Explore Parapro® systems
Siplast lab technician performing quality control testing on roofing materials.

Our quality control commitment

Stringent quality control tests are performed on every batch to ensure that all Parapro® products meet Siplast performance standards. In addition, Siplast Research and Development evaluates the latest advancements in roofing technology to ensure that we continuously deliver innovative roofing solutions that solve your toughest challenges.

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Parapro® products

Parapro resins are each formulated to meet the demands of specific applications, from flashing and roofing to vegetated roof waterproofing.
Industrial tank containing Siplast Parapro Roof Membrane Resin for PMMA systems.

Parapro® Roof Membrane Resin

Parapro® Roof Membrane Resin is a high-performance multi-component, fast-curing, PMMA resin used in Parapro® roof membrane systems for horizontal applications of 2:12 or lower slopes. When catalyzed, Parapro® Roof Membrane Resin is combined with Pro Fleece to form a monolithic, reinforced roof membrane system.
View Parapro Roof Membrane Resin
Commercial roof showing Siplast Parapro Flashing on complex penetrations and beams.

Parapro® Flashing (formerly known as Parapro 123 Flashing)

Parapro Flashing is an ideal solution for difficult flashing situations, including equipment supports, I-beams, H-beams, stanchions, conduits, and unusual penetrations. It is a layered application consisting of a base and top coat of catalyzed, thixotropic PMMA resin encapsulating a layer of polyester fleece. Parapro Flashing can also be installed between the plies of Siplast SBS-modified bitumen roof systems, or on top of the Siplast Paradiene 30 finish ply. In addition, Parapro adheres to many common construction materials, including plastics, concrete, and steel. The finished application is fully reinforced and seamless.
View Parapro Flashing Resin

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Explore our blog’s “Roofing” category for an expansive collection of roofing insights and 101-, 201-, and 301-level educational content.
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Parapro Flashing and Roof Membrane FAQs

What are the advantages of using Siplast Parapro Flashing for your next project?

Advantages that Parapro Flashing offer include ultra-fast cure times, exceptional durability, and UV resistance. It's ideal for challenging roof geometries and can also be used as a repairing material.


Why has Siplast Parapro Flashing also been known as Parapro 123 Flashing?

Parapro 123 Flashing was the original name of the product, which referred to its application being as easy as 1, 2, 3. While the product is still quick and easy to apply, we dropped the numbers from the name, and it is now called Parapro Flashing.


Why has Siplast Parapro Flashing also been known as Parapro 123 Flashing?

Parapro 123 Flashing was the original name of the product, which referred to its application being as easy as 1, 2, 3. While the product is still quick and easy to apply, we dropped the numbers from the name, and it is now called Parapro Flashing.