Curb details
PMMA liquid-applied flashing can prevent water from getting through the roof membrane and causing leaks.
Polymethyl Methacrylate (PMMA) for roofing
Liquid-applied roofing materials that meet the performance standards of Siplast
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Introduction to PMMA
What is PMMA for roofing?
One of the most successful commercial product innovations of the last century occurred in the 1930s when polymethyl methacrylate resins, commonly known as PMMA, were first synthesized. Practical applications for the new resin, which included everything from aircraft windshields to dentures, soon followed. The material proved to be exceptionally durable, and the use of PMMA grew rapidly. But in spite of its outstanding performance, the material was too rigid for use in waterproofing applications - until the 1970s.
That's when a PMMA formulation was developed that, once cured, was resilient rather than rigid. Today, Parapro Roof Membrane and Flashing Systems offer all the benefits of PMMA technology and liquid application in products that meet the performance standards of Siplast.
Advantages of Implementing Siplast PMMA Systems
Jobs with difficult access, tight clearances, odd-shaped penetrations, and exposure to substances that can adversely affect conventional roofing materials can be a challenge for even the best traditional roofing plies. In such cases, a liquid-applied Parapro System is an excellent option. Parapro Roof Membrane can be used in conjunction with Siplast Paradiene roof membranes or as a stand-alone alternative to roofing sheets. Parapro is ideal for areas where flame-free application is required, water doesn’t drain quickly or completely, or areas requiring resistance to many conditions and substances that can negatively affect more traditional roofing products.
Applications of PMMA for roofing
Parapro Resins are each formulated to meet the demands of specific applications, from flashing and roofing to vegetated roof waterproofing.
Flashing details
Drain details
Protect your building by removing ponding water from the roof with PMMA liquid-applied flashing for the drain detail.
Penetration details
Parapets, I-beams, and other penetrations protect your building by removing ponding water from the roof with PMMA liquid-applied flashing for the drain detail.
Get started with essential components for PMMA roofing
Resins alone do not provide all the benefits of PMMA roofing. PMMA resin requires peroxide to initiate a chemical reaction, which turns the liquid MMA monomers into a high-performance PMMA membrane.
Pro Fleece
A reinforcement is one of the resilient layers encapsulated in liquid-applied roofing PMMA systems to provide additional resiliency and redundancy. Pro Fleece is a non-woven, needle-punched polyester fabric reinforcement, once encapsulated in resin, enhances the durability of the Parapro Roof Membrane and Parapro Flashing Resins.
Pro Color Finish
To designate traffic paths, like walkways, Pro Color Finish can be used to complete the PMMA roofing system. Pro Color Finish is a pigmented PMMA resin applied over roofing systems and is available in a variety of standard colors.
Resins for PMMA roofing
Siplast Parapro Resins are manufactured at our state-of-the-art North American liquid resin manufacturing facility. In the Resin Laboratory, stringent quality control tests are performed on every batch of material we produce to ensure that all Parapro products meet key performance criteria. In addition, Siplast Research and Development continually studies issues related to application quality control, and long-term performance.
Parapro Roof Membrane Resin for horizontal applications
The Parapro Roof Membrane System is a seamless, fully reinforced, layered application consisting of one coat of primer (if required) and a waterproofing membrane comprised of two resin waterproofing coats and polyester fleece fabric. The completed high-mil thickness application provides a durable, resilient waterproofing membrane.
Parapro Flashing Resin for vertical applications
Parapro Flashing Resin, when catalyzed, is combined with polyester fleece to form a monolithic, reinforced waterproofing flashing membrane system. Parapro Flashing Resin is designed for use in conjunction with a variety of Siplast roofing and waterproofing systems for flashing details and as a repair material.
Explore high performance and exceptional protection Discover our systems
Enhance your roof with Pro Base, a component that was made to reflect light
Pro Base series sheets are high-performance
SBS-modified bitumen base plies specifically designed for use with Siplast’s liquid-applied Parapro Membrane Systems. Pro Base consists of a lightweight random fibrous glass mat impregnated and coated with a high-quality SBS-modified bitumen. The top surface is factory coated with a proprietary Syntan® acrylic coating. This series of sheets are approved for a maximum of 14 days of exposure prior to application of Parapro.
Frequently Asked Questions
What products can I use to clean PMMA roofing systems?
Pro Prep and Pro Prep M are used to clean the transition areas of in-place Parapro and Terapro Waterproofing and Flashing Membranes at tie-ins, repairs, and between staged coats of resin. They are also used to clean metal and plastic surfaces prior to application of Parapro and Terapro Systems. Pro Prep and Pro Prep M can also be utilized for cleaning spills, tools, and equipment.
How to repair damage to PMMA roofing systems?
Avoiding damage to the roof starts with a installation. To help ensure a successful application of Parapro Roof Systems, it's important to remember to accurately catalyze the resins, prepare the substrate, and follow other detailed instructions in the Installer's Guide here.
To prevent damage to cured Parapro Roof Systems, it's helpful to install walkways and surfacing layers on top of the PMMA roofing membrane. The Parapro Roof Systems can be surfaced with aggregates, and optional color finishes can be applied to the cured Parapro Roof Membrane, simplifying the application and maintenance of rooftop markings.
In the case of a recover, Siplast materials are especially suitable and widely used in these roofing applications. Each re‑cover application is unique and should be considered individually. Siplast recommends the use of analytical tools such as nondestructive moisture survey methods as well as test cuts and any other evaluation methods available to ascertain existing roof conditions.
This thorough inspection of the existing roof conditions must be made to determine that:
- the deck is structurally sound,
- the deck is able to take the added weight of the new assembly,
- areas where moisture may be present have been located,
- the method and degree of attachment of the existing assembly has been specifically ascertained,
- minimum 8‑inch flashing heights will exist at curbs, walls, etc, and
- the new assembly will provide proper drainage.
In all cases, the old roof assembly should be separated from the new Siplast materials with a product and installation procedure appropriate to the existing deck, roof system, and surfacing. Please contact your Siplast Representative for recommendations tailored to meet your particular roof re‑cover conditions.
Proper storage of PMMA Materials
To facilitate the application of adhesive at ambient temperatures below 70ºF (21ºC), all materials such as resins, adhesive, and roll goods should be stored in a warm place such as a heated trailer or other climate-controlled storage area prior to use.
Application in cool weather can be completed more effectively by cutting warmed rolls into halves or thirds and stacking the sheets with the unsurfaced-side upward to allow for solar heating. Cut sheets should be allowed to lay flat for a minimum of 30 minutes (time will vary based on the ambient temperature and solar load) to allow them to “relax.”
For additional information see Cold Weather Application SBS & PMMA Products.
