They’re basically steel flanges you glue/screw to a joist before drilling it out (or notching it) for a plumbing (or other) penetration. No more do you have to build headers or bulkheads. Nor do you have to sweat Twinkies gusseting joists with plywood for added support before your plumber Swiss cheeses them. You can use Metwoof Reinforcers with engineered I-Joists, 2×8, 2×10 or 2×12 solid sawn floor systems.
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