Rerurn to Romy the Cat's Site

Referring back to "retro-fitted", under-floor shoring in finished rooms, such as basements, I forgot to mention something I have run into a few times, in "traffic areas".  This is the disintegration of the drywall ceiling board that almost invariably winds up between the bottom of the floor joists and the top of retro-fitted support beams.  When this occurs, it can be cured by using temp shores to lower semi-permanent beams, cutting out problem drywall areas, and fitting solid shims between the beam tops and joist bottoms.  Expanding foam can be injected to seal between shims and adjacent drywall.

The second "forgotten" item is that  man-made, "architectual" or "engineered", joists also have a "disadvantage".  This is the fact that floor systems using them tend to vibrate and "transmit vibration" well up into MF.  There are too many ways to deal with this to get into it here, but the initial rule of thumb is to avoid "over-tightening" re-shores, especially when dealing with "hollow" (drywalled, uninsulated) engineered floor cavities.  In a nutshell, especially with these systems, there is often a fine line between LF damping and MF enabling.

Paul S

Rerurn to Romy the Cat's Site