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In the Forum: Horn-Loaded Speakers
In the Thread: Midbass Horns and Real Estate.
Post Subject: Roger, the SisteringPosted by Paul S on: 1/29/2010
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Joist sistering is nice not just because it strengthens the whole structure but it also reduces the clear span for the floor sheeting, itself. Depending on how it's done, sistering can actually serve as a structural substitute for beams and shoring, where that is not practical or it is not desired. Still, it's nice to be able to "tune" the listening room floor with screw jacks, if you can do it. Sistering can also be fairly involved, for a number of reasons that are case-specific. I have done some small-ish areas that took several days because of complicated blocking and/or strapping, etc., stepped floors, pony walls, and/or plumbing, HVAC, electrical, etc., ad nauseum, not to mention getting new, straight joists in alongside old, badly sagging joists. It's a matter of degree versus access, believe me. If the polyurethane references are for a solid foam filling, I have never done it in a floor cavity, and I'm not sure I'd want to, since that precludes subsequent access or "fishing" without serious digging. One does want to fill the floor cavity voids with something suitable before drywall/plastering, however, for acoustic reasons.
Paul SRerurn to Romy the Cat's Site