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Dow® THERMAX™ Sheathing at CBSI

For customers across VA, MD, DE, NJ, PA, and Washington D.C.

Dow Building Solutions has been raising the roof on product quality and customer expectations in the building materials industry for more than 70 years, providing “excellence – from the ground up”. With advocacy, expertise, and innovation, every effort is focused on developing products that deliver ever-greater sustainability, durability, efficiency, comfort, health, and safety for customers.

Capitol Building Supply Inc. is committed to providing the highest quality construction supplies. Dow THERMAX™ insulation products are available for pickup at any of our yards in Virginia, Maryland, Delaware, New Jersey, Pennsylvania, or Washington, D.C., or can be delivered directly to your commercial or residential jobsites.

Visit a showroom or search our inventory online to learn more.

Best Insulation Sheathing Products in VA, MD, DE, NJ, PA, and D.C.

From foundations and floors, to ceilings, attics, and roofs, Dow’s extensive line of quality insulation and building materials are designed to deliver satisfaction and performance at every level of your buildings and structures.

CBSI carries a full line of THERMAX insulation sheathing products for construction pros in the Mid-Atlantic region and beyond.

Quality Rigid Foam Insulation Sheathing for Mid-Atlantic Builders

The THERMAX system is a rigid foam insulation that can be used for a variety of applications, including concealed and exposed applications, as well as above and below grade.

Appropriate for both commercial and residential insulation projects across the Mid-Atlantic, THERMAX sheathing:

  • Is ideal for walls including non-vented crawl spaces, interior walls of metal buildings, and interior basement walls
  • Can be installed without a thermal barrier and can also be used with hourly rated assemblies
  • Features reinforcing facers and chemical modifiers contributing to fire resistance and durability
  • Has a glass-fiber-infused polyisocyanurate foam core laminated between aluminum facers on both sides
  • Carries a Class A fire rating and reduces condensation due to its low perm rating
  • Comes in a variety of thicknesses (1/2” to 2”) and R-values (3.3 to 13.0)
  • Features square or shiplap edges, depending on the product chosen

THERMAX sheathing from Dow is lightweight and easy to install and can be easily cut using a knife or saw. It can be installed on both walls and ceilings including girts, steel studs, block, wood, tilt-up, purlins, trusses, and bar joints.

Buy Dow THERMAX Sheathing at CBSI in VA, MD, DE, NJ, PA, and D.C.

Mid-Atlantic builders and construction pros - learn more about the THERMAX sheathing system by Dow, or start your order now. Capitol Building Supply, Inc. is here to help.

Find a CBSI Location Near You

About Capitol Building Supply, Inc.

Capitol Building Supply is a proud member of the GMS family of companies. Serving both commercial and residential customers, we offer the largest inventory of construction supplies in Virginia, Maryland, Delaware, New Jersey, Pennsylvania, and Washington D.C. Our employees pride themselves on being hard working, safe, and professional. Whether you need drywall, insulation, acoustical tile, tools, or other construction accessories, we've got your Mid-Atlantic construction needs covered.

About Dow

Dow never stops evolving. In fact, adapting to change and responding to the challenge with innovation has been the standard operating procedures for over a century. Striving to solve the greatest challenges in the building environment while improving communities worldwide with safer, more affordable, and sustainable building solutions has made Dow a trusted leader in the industry and community worldwide.

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About Us

Teaming up with the top brands in the industry, we have one simple pledge: to get the right products into our customers' hands as quickly and safely as possible.

Our Services

Capitol Building Supply carries a full range of commercial and residential construction supplies, and our crews are fully trained to deliver to all sites.

Our Locations

Our delivery fleet is dispatched from 19 locations including two yards in Delaware (Dover, Selbyville), eight yards in Maryland (Baltimore, Beltsville, Bladensburg, Forestville, Frederick, Gaithersburg, Hagerstown, Upper Marlboro), one yard in New Jersey (Camden), one yard in Pennsylvania (Harrisburg), six yards in Virginia (Manassas, Marshall, Springfield, Stafford, Vienna, Winchester), and one yard in Washington, D.C.

Contact Us

For more information about how to contact us, visit our Find a Yard page. Or, click the Contact Us tab to send us an email.