Can you powerwash composite?

Can you powerwash composite?

Yes, though the details matter significantly depending on the specific composite product. Newer, high-performance composite decking with a protective outer shell can generally tolerate a pressure washer rated under roughly 3,100 PSI, provided you use a fan-tip nozzle and keep it at least 8 inches from the surface. Older or uncapped composite products, which lack that protective shell, are more vulnerable to pressure damage, and several manufacturers explicitly discourage pressure washing them at all, recommending soap-and-water cleaning instead. Using excessive pressure or holding the nozzle too close on any composite surface risks exposing the underlying wood fibers, which accelerates staining and mold growth over time. Always check your specific product line’s manufacturer guidelines before pressure washing composite, since recommendations vary meaningfully between generations of the same product.