About Us

70 years of building Seattle

Since 1950 Colorado Steel Sash has been distributing products, tools and consumables to the professional glaziers who are building Seattle and the rest of the Puget Sound. We also distribute products to the waterproofing and coatings industry, and have expanded coverage in Oregon with our Portland warehouse and staff.

Product Focus

We specialize in sealants, coatings, tapes and specialty tools for the building envelope. In sealants and coatings we provide a variety of industrial and commercial grade silicones, urethanes, butyls and other proprietary polymers. In the tape department our specialty is adhesive foam tapes, PVC tapes, butyl tapes and more. We operate two foam slitters generating hundreds of thousands of feet per year of custom foam tapes to cover any need. Custom sized foam tapes can usually be produced within 24 hours. We also provide custom die cut foam, adhesive foam, and EPDM rubber products such as specialty application washers, spacers and pads for unique manufacturing applications. In addition to these areas we carry system accessories for the application of all of our products such as backer rod, silicone extrusions, sand, rollers, brushes, gloves and much more.

Nationwide Delivery with Locally Owned Service

Colorado Steel Sash is a family owned business with headquarters in Seattle’s Georgetown neighborhood. We love the Pacific Northwest and are committed to providing only the best products and honest services to our partner contractors both locally and nationwide.

Warehouse & Will Call

Our Seattle warehouse is open 6 days a week and our Portland warehouse 5 days a week for product selection and pickup. Our Seattle will call hours are tailored to working crews; we are open from 5:00 a.m. to 4:30 p.m. allowing early pickup before work starts on the jobsite. We cater to the professional installer and contractor by providing fast in-and-out pickup, accurate product lead times, and a wealth of industry and product knowledge. Although we specialize in serving contractors, we are open to the general public.