Capitol Steel stocks a complete line of vapor barriers for under-slab installation, from standard poly sheeting to the premium W.R. Meadows Perminator system. The Perminator is a multi-layer, puncture-resistant vapor retarder that meets ASTM E1745 Class A requirements — specified for commercial, retail, and healthcare slabs where moisture control is critical. Perminator Tape ensures fully sealed seams and overlaps.
We serve contractors across Northern California with knowledgeable staff who understand your projects. Get expert recommendations on the right materials for your application — no guesswork.
Our delivery team brings top-quality construction materials directly to your job site. Reliable scheduling and careful handling mean your materials arrive ready to use.
Choosing Capitol Steel means partnering with a team that values quality, reliability, and innovation. We bring together decades of experience, skilled craftsmanship, and a commitment to your satisfaction.
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