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Firestop

Keeping your building safe and protected.

A range of products to protect your jobsite from fire and smoke.

Today’s construction projects require proper barriers to prevent the spread of flames, gases and smoke during building upgrades and installations. Capitol Building Supply stocks a large inventory of firestop products to meet the needs of the most demanding applications. We carry the following products from STI, 3M and Strike First:

  • Intumescent products
  • Fire caulking
  • Firestop bags, sleeves and devices
  • Mortar and putties
  • Smoke sealants
  • A variety of adhesives

Our firestop products can also be used to fill in breaches in fire-resistant floors and walls.

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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.