Fiberglass Deck Joists, Explained
Fiberglass-reinforced polymer (FRP) has been used for decades where wood rots and steel corrodes. VORO brings it to deck framing.
What is FRP?
Fiberglass-reinforced polymer, often called FRP or fiberglass composite, combines glass fibers with a polymer resin. The fibers carry the load; the resin holds them together and protects them. The result is a material that is strong for its weight and does not rot or rust.
FRP vs. wood-plastic "composite"
"Composite" can mean two very different things. Most composite deck boards are wood-plastic blends, which are not used as structural framing. A fiberglass composite like VORO is a structural material, made to be used as joists, beams and posts.
What to look for in a fiberglass deck joist
- Span data independently reviewed and stamped by a Professional Engineer for the loads and spacing you build to. VORO's span tables for joists, beams and posts are independently reviewed and stamped by a Professional Engineer.
- Water absorption: VORO tests at 0.6% maximum in 24 hours.
- Fire performance: VORO has a flame spread index of 25 maximum (Class A) and a UL 94 V-0 rating.
- Standard sizes that fit the way decks are designed. VORO comes in 2x4, 2x6, 2x8, 2x10 and 2x12 profiles, plus 4x4 and 6x6.
- Fastener and connection guidance from the maker. Contact us for VORO's recommendations before you build.
Working with fiberglass framing
VORO is cut and handled with common job-site tools. As with any fiberglass product, wear eye protection and a dust mask when cutting. Full material properties are on the specs page, and common questions are answered in the FAQ.
More guides: Deck Framing Options Compared · Deck Framing for Coastal & Humid Climates · Become a VORO Dealer · VORO Installation Basics
This guide is general information, not engineering advice or a warranty. Product values are typical results from manufacturer testing. Structural work should be designed or reviewed by a licensed professional and must meet local building codes.