Protected Membrane Roof

Dow Building Solutions’ patented, energy-efficient STYROFOAM™ Brand Extruded Polystyrene Foam (XPS) Insulation is a critical component of protected membrane roof (PMR) technology, enabling a perfect foundation for a garden or green roof on the top of a building.

Protected Membrane Roofs: Dow’s Insulation Solution

In a protected membrane roof assembly – the foundation for green roofs  – the insulation is placed on top of the membrane, improving the performance and longevity of the roof system. Dow insulation solutions are perfect for PMR roof assembly because they offer:

  • Proven long-term performance – Membranes in PMR assemblies incorporating STYROFOAM XPS Insulation are still in exceptional condition 40 years after they were first installed.
  • Closed-cell structure – The closed-cell structure of the insulation prevents moisture penetration, which could otherwise compromise the roof’s thermal efficiency.
  • Thermal efficiency – STYROFOAM™ XPS insulation enhances thermal efficiency by reducing energy use and HVAC loads – just one way our patented solution helps lower a building's carbon footprint.
  • Superior temperature control – Closed-cell insulation helps keep the roof membrane’s temperature constant, reducing the harmful effects of freeze-thaw cycling and excessive heat, and extending the life of the membrane.
  • Durability and reusability – The high compressive strength and durability of STYROFOAM™ XPS Insulation stands up to heavy loads. What’s more, the insulation can be reused in many cases, decreasing the volume of material that ends up in landfills.
  • Versatility – A variety of compressive strengths and board styles are available to meet different roof specification needs.


Green Roof

invision_house_accordionThe sky's the limit for roof designs that combine energy efficiency and sustainability. That’s why one of the fastest growing segments in the commercial roofing industry is the design and construction of “green” or landscaped roofs. When planning an earth-friendly green roof, a roof that leaves the membrane protected with energy-efficient, reusable STYROFOAM™ Brand Extruded Polystyrene Foam Insulation is an essential component.

Interested in learning more about green roof design? Check out Green Roof PMR – A Design Primer for installation details, including the correct placement of membrane, insulation, soil and drainage components.

3D Model For PMR Assembly – Green Roof Design
This 3D Model uses Google SketchUp. Please visit the Google Web site to download SketchUp.

Plaza Deck

Plaza Deck ImageCommercial rooftops may be the building industry’s own “space race.” After all, the square footage is there, just waiting to be put to good use.

With the development of the protected membrane roof (PMR) assembly by Dow scientists more than 40 years ago, useful, practical and economical plaza roofs became possible. Today, plaza roofs featuring STYROFOAM™ Brand Extruded Polystyrene Foam Insulation support high-performance, multi-purpose areas such as decks, terraces, walkways and even gardens.

3D Model For Plaza Deck Roofing Systems
This 3D Model uses Google SketchUp. Please visit the Google Web site to download SketchUp.


Marketing Partners

American Hydrotech, Inc

American Hydrotech, Inc. is the manufacturer of Monolithic Membrane 6125† (MM6125), a rubberized asphalt membrane for commercial waterproofing and roofing applications. MM6125 has been used worldwide for more than 50 years on all types of vertical and horizontal structures, including roofs, parking decks and plazas. With more than two billion square feet of MM6125† installed on projects in over 36 countries, Hydrotech is recognized as a leader in the waterproofing industry.

Headquartered in Chicago, American Hydrotech is the oldest continuous user/supplier of STYROFOAM™ Brand Extruded Polystyrene Insulation products from Dow.

For more information, please visit or call 1-800-877-6125.

† 2013 - American Hydrotech, Inc. All Rights Reserved.

Carlisle Coatings & Waterproofing

Carlisle Coatings & Waterproofing Incorporated offers a complete line of waterproofing and moisture protection products for the architectural, general construction, industrial and maintenance industries.

For more information, contact CCW toll-free at: 1-800-527-7092 or

Carlisle SynTec Inc.

For more than 30 years, Carlisle SynTec Incorporated has offered quality roofing and waterproofing products and systems. Based in Carlisle, Pa., Carlisle SynTec has installed more than 5 billion square feet of Carlisle roofing and waterproofing systems. Carlisle offers EPDM, fleece back and TPO (thermoplastic polyolefin) membranes in combination with STYROFOAM™ Brand Extruded Polystyrene Insulation, providing specifiers and contractors with more choices for roofing-system solutions. In addition, STYROFOAM™ Brand Extruded Polystyrene Insulation is a Carlisle-approved insulation for use in its membrane-only warranted roofing systems.

For more information, please visit or call 1-800-4-SYNTEC.

CETCO Building Materials Group

Strataseal HR represents the next step in hot-applied rubberized membrane solutions for roofing and horizontal waterproofing applications from CETCO®. It combines decades of membrane polymer experience and advanced mineral enhancement technology into a 100% solids thermoplastic product that is flexible as well as self-sealing. Strataseal HR is ready for use and requires no set-up to provide a water-tight membrane.

For more information, please visit: or call: 1-866-498-7543 (US and Canada only).

Henry Corporation

Henry is the leading manufacturer of premium roofing and roof maintenance products. Henry roof coatings, roof cements, and roof maintenance systems are used in a variety of roof leak repair, roof protection, roof restoration, and cool roof applications.

Combining technical experience with a commitment to providing quality products, Henry has become a trusted source of complete roofing and roof maintenance solutions, for the contractor, building owner and designer.

For more information, please visit: or call 1-323-583-5000.


The Commercial Roofing Department of Pittsburgh-based Koppers Industries Inc. offers a single-source warranty when coal tar bitumen membranes are combined with STYROFOAM™ Brand Extruded Polystyrene Insulation in Protected Membrane Roof (PMR) constructions. Coal tar is often specified for flat or low-sloped roofs.

For more information, please visit or call 1-412-227-2001.

Liquid Plastics Limited (LPL)

Liquid Plastics Limited (LPL) the manufactures high technology surface coatings and seamless flooring systems. The company forms part of the Iotech Group, which also includes a number of associate companies - namely Belgium-based Pentagon Plastics NV, American-based Liquid Plastics Inc., Flexcrete Limited and Industrial Copolymers Limited, which are based at Liquid Plastics' five-acre head office and manufacturing complex in Preston, North West England.

For more information, please e-mail: or call +44 (0) 1772 259781.

Moisture Controls

The CTEM-SAM fully adhered coal tar based sheet membrane is ideal for new and retrofit roofing as it involves no kettles, torches or adhesives.

For more information, please call 1-717-243-9932.

Sarnafil Inc.

Sarnafil Inc. incorporates STYROFOAM™ Brand Extruded Polystyrene Insulation with its PVC and TPO membranes in its waterproofing systems. Headquartered in Canton, Mass., Sarnafil is a leader in the production of reinforced, single-ply thermoplastic waterproofing membranes.

For more information, please visit or call 1-800-457-2504.


Soprema offers self-adhering and torch-applied modified bitumen systems that incorporate STYROFOAM™ Brand Extruded Polystyrene Insulation in both PMR and conventionally insulated constructions. Based in Wadsworth, Ohio, Soprema continues to be a leading innovator of roofing and waterproofing systems for above- and below-grade applications.

For more information, please visit

T. Clear

T. Clear Corporation manufactures LightGUARD® and HeavyGUARD® roof insulation panels for Protected Membrane Roof systems. Additional building envelope products from T. Clear include ProGUARD® concrete insulated sheathing, WallGUARD® concrete faced perimeter insulation panels and ThermaDRY® insulating drainage panels for below grade walls/structures.

Since 1975 T. Clear has manufactured over 100 million square feet of LightGUARD and HeavyGUARD panels for PMR roofs across North America.

For more information, please visit: or call 1-800-544-7398.

TAMKO Roofing Products, Inc.

TAMKO Roofing Products, Inc. includes STYROFOAM™ Brand Extruded Polystyrene Insulation in its full-systems roofing warranty, TSC Total System Coverage. Based in Joplin, Mo., TAMKO offers BUR (Built-Up Roofing) and modified bitumen systems that can incorporate STYROFOAM™ Brand Extruded Polystyrene Insulation.

For more information, please visit or call 1-800-641-4691.

Have a question?

A sustainable PMR design can reduce total roof-life costs up to 22%. Learn How.

Now it's easier than ever to determine the "constructability" of your designs. Access the BIM models here.