nostos156 Posted August 24, 2023 Share Posted August 24, 2023 (edited) Doing a room where I recently tore down and insulated an exterior wall. Heavily considering tearing down all the ceiling and other walls as well because trying to stabilise some of the plaster is doing my nut in. Problem is, the lath and plaster is a very good sound absorber and I generally like how little noise reaches this room (loft room). What could I do without killing interior space to closely replicate the lath and plaster walls? Edited August 24, 2023 by nostos156 Link to comment Share on other sites More sharing options...
nod Posted August 25, 2023 Share Posted August 25, 2023 Tear down the lath and replace with a 15 mil soundblock board (blue) Link to comment Share on other sites More sharing options...
joe90 Posted August 25, 2023 Share Posted August 25, 2023 Or double board with 12.5 mil boards. Link to comment Share on other sites More sharing options...
nostos156 Posted August 25, 2023 Author Share Posted August 25, 2023 Huh, from the reading I did it seemed those boards, even when double boarded, still had nowhere near the density of plaster? Double boarding does seem the better option from those two choices because hauling full sheets of heavy sound stuff up a flight of stairs sounds like a good way to die. Link to comment Share on other sites More sharing options...
Conor Posted August 25, 2023 Share Posted August 25, 2023 Is boarding over an option? House we bought the previous owners had done precisely that in half the house. Used something like 63x22mm battens. Removing old lath and plaster ceilings isn't a nice job. Link to comment Share on other sites More sharing options...
nostos156 Posted August 25, 2023 Author Share Posted August 25, 2023 (edited) 28 minutes ago, Conor said: Is boarding over an option? House we bought the previous owners had done precisely that in half the house. Used something like 63x22mm battens. Removing old lath and plaster ceilings isn't a nice job. It may be possible, but I'd have to skip the battens and screw the board straight into the plaster, and just have the plaster act as a batten/packer. The ceiling is barely 230cm high and to make matters worse, it's a sloped ceiling with bloody curves at the corners, so I'd have to chip them away and refill into straight edges to get this to work. Edited August 25, 2023 by nostos156 Link to comment Share on other sites More sharing options...
Big Jimbo Posted August 25, 2023 Share Posted August 25, 2023 Previously, i just bonded out the dips using a long straight edge. Foam glued and screwed the plasterboard to the underside. Skimmed and painted. Bit of a pain, but better than pulling down lath and plaster ceilings. Even with a good mask you will be trying to get bits of crap out from between your teeth for days. Link to comment Share on other sites More sharing options...
nostos156 Posted August 25, 2023 Author Share Posted August 25, 2023 (edited) 12 minutes ago, Big Jimbo said: Previously, i just bonded out the dips using a long straight edge. Foam glued and screwed the plasterboard to the underside. Skimmed and painted. Bit of a pain, but better than pulling down lath and plaster ceilings. Even with a good mask you will be trying to get bits of crap out from between your teeth for days. One thing I'm not sure how to figure out is getting a good fixing for the PB at the corners, as mentioned. They're built out and curved at the slopes and ceiling, so I'd have to chip them back straight and hope the screws can find timber along the egdes there. I've done removal before like with this wall and to be honest with a half face P100 it was effortless, it was just the sheer mess on the floor that was annoying. Edited August 25, 2023 by nostos156 Link to comment Share on other sites More sharing options...
Big Jimbo Posted August 25, 2023 Share Posted August 25, 2023 That's why i used the glue. Link to comment Share on other sites More sharing options...
nostos156 Posted August 25, 2023 Author Share Posted August 25, 2023 (edited) 1 hour ago, Big Jimbo said: That's why i used the glue. So you basically skimmed your walls flat then boarded and joined edges where there was only lath support with foam glue? Edited August 25, 2023 by nostos156 Link to comment Share on other sites More sharing options...
Big Jimbo Posted August 25, 2023 Share Posted August 25, 2023 Loads of screws and joints glued to each other. Link to comment Share on other sites More sharing options...
nostos156 Posted August 25, 2023 Author Share Posted August 25, 2023 (edited) By the way, if I go ahead with this, what should I use to add extra insulation? The wall I tore down I used PIR (wanted a wardrobe there so needed to ensure max performance and no cold bridging to the back of it), but it would be fairly expensive to do that on every other wall + the sloped ceiling. I'm also not sure if there are concerns about enclosing a cold roof loft room entirely within PIR when it comes to moisture. The insulation already up there is the fiberglass crap so likely doesn't offer much performance after probably 30 years. Was thinking maybe cramming some rockwool up there would help, RWA45? if I go for that, can it freestand within the wall cavities that are exposed to the open eaves (like PIR can), or will I need to brace it with something on the eaves side to stop it slumping out? Edited August 25, 2023 by nostos156 Link to comment Share on other sites More sharing options...
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