MJNewton Posted April 30, 2020 Share Posted April 30, 2020 (edited) I am putting a new ceiling into our extended 'family room' and was planning on using 15mm plasterboard rather than 12.5mm. The reason being was that I figured it might provides benefits in terms of improved acoustic attenuation for the bedroom above and slightly better fire rating. Perhaps even some benefit regarding stiffness and strength? I've got a plasterboard lifter so the extra weight when installing isn't of concern and I probably only need around a dozen 2.4m x 1.2m sheets so the extra cost should be minimal. However, I didn't realise that 15mm PB doesn't seem to be widely available, even aside from the current supply issues for all gypsum products at the moment, and so I am beginning to have second thoughts if it's not the 'done thing'. Also, where it is sold, it is generally tapered edge and yet I was going to get the whole thing skimmed and so would be wanting square edge. Am I do something odd here? Just wondered if anyone has any thoughts on whether 15mm would provide the assumed benefits, or should I just stick to 12.5mm? Edited April 30, 2020 by MJNewton Link to comment Share on other sites More sharing options...
nod Posted April 30, 2020 Share Posted April 30, 2020 7 hours ago, MJNewton said: I am putting a new ceiling into our extended 'family room' and was planning on using 15mm plasterboard rather than 12.5mm. The reason being was that I figured it might provides benefits in terms of improved acoustic attenuation for the bedroom above and slightly better fire rating. Perhaps even some benefit regarding stiffness and strength? I've got a plasterboard lifter so the extra weight when installing isn't of concern and I probably only need around a dozen 2.4m x 1.2m sheets so the extra cost should be minimal. However, I didn't realise that 15mm PB doesn't seem to be widely available, even aside from the current supply issues for all gypsum products at the moment, and so I am beginning to have second thoughts if it's not the 'done thing'. Also, where it is sold, it is generally tapered edge and yet I was going to get the whole thing skimmed and so would be wanting square edge. Am I do something odd here? Just wondered if anyone has any thoughts on whether 15mm would provide the assumed benefits, or should I just stick to 12.5mm? 12.5 PB are hardly ever used on ceilings in single layer One of the main benefits is that you can use I5 mil on 600 centre ceilings without needing to support the edges Less cracks on 15 mil boards Better for for D&D Most builders merchants will stock 15 mil Also 15 mil duplex Link to comment Share on other sites More sharing options...
Oz07 Posted May 1, 2020 Share Posted May 1, 2020 Used 15mm on latest place ceilings. Defintley flexes less on the 600 centres but I always used 12.5 with noggins before and never had a problem. Horses for courses Link to comment Share on other sites More sharing options...
MikeGrahamT21 Posted May 1, 2020 Share Posted May 1, 2020 Will be a bit more sound insulation too from the 15mm Link to comment Share on other sites More sharing options...
MJNewton Posted May 1, 2020 Author Share Posted May 1, 2020 (edited) Thanks everyone - maybe it's not so strange a route to take afterall. I do actually have a few joists on 600mm centres (not sure why - I guess it saves on a joist or two in an area that doesn't otherwise need them) and so the 15mm should be better suited (notwithstanding the point about noggins likely sufficing). On the supply front I must admit to bit having asked the local builder's merchant (they're all closed, I think) and so was only searching online which might not be representative. I think I'll continue with the plan. Edited May 1, 2020 by MJNewton Link to comment Share on other sites More sharing options...
Onoff Posted May 1, 2020 Share Posted May 1, 2020 Certainly 15mm Sound Bloc (blue) does what it says on the tin. As I got some free (3m boards) I used it on a couple of walls and you can hear zilch from the other side. More meat there too with 15mm when cutting out for downlights, dry lining boxes etc. Link to comment Share on other sites More sharing options...
Carrerahill Posted May 1, 2020 Share Posted May 1, 2020 10 hours ago, nod said: 12.5 PB are hardly ever used on ceilings in single layer One of the main benefits is that you can use I5 mil on 600 centre ceilings without needing to support the edges Less cracks on 15 mil boards Better for for D&D Most builders merchants will stock 15 mil Also 15 mil duplex Nod, was it you that posted some images of a big dry lining project you had done recently? A big MF and board wall? Link to comment Share on other sites More sharing options...
Mr Punter Posted May 1, 2020 Share Posted May 1, 2020 1 hour ago, Onoff said: Certainly 15mm Sound Bloc (blue) does what it says on the tin. As I got some free (3m boards) I used it on a couple of walls and you can hear zilch from the other side. More meat there too with 15mm when cutting out for downlights, dry lining boxes etc. These are really heavy and awkward. I could not lift one on my own. We did have a tacker use some but he was young and well built. 2.4m is doable though. Link to comment Share on other sites More sharing options...
nod Posted May 1, 2020 Share Posted May 1, 2020 39 minutes ago, Mr Punter said: These are really heavy and awkward. I could not lift one on my own. We did have a tacker use some but he was young and well built. 2.4m is doable though. 15 mil sound are heavier It’s surprising how you get used to handling them I’m 58 and can still fix them to a ceiling on my own if I have to 20 years back it was always 3/8 boards on the ceilings Now they where a pain on your own Prone to snapping Link to comment Share on other sites More sharing options...
Onoff Posted May 1, 2020 Share Posted May 1, 2020 1 hour ago, Mr Punter said: These are really heavy and awkward. I could not lift one on my own. We did have a tacker use some but he was young and well built. 2.4m is doable though. One of the many reasons why my back is like it is. S'funny how I'd always find the strength to lift something if it was free. No change there then. ? 1 Link to comment Share on other sites More sharing options...
nod Posted May 1, 2020 Share Posted May 1, 2020 18 minutes ago, Onoff said: One of the many reasons why my back is like it is. S'funny how I'd always find the strength to lift something if it was free. No change there then. ? It is All the plaster and cement bags where twice as Heavy We used to carry two in when we were loading Now I see young lads wondering upstairs with one 25 kg bag on there shoulder They think I’m being funny telling them to stick another on there shoulder A few month back we had 300 100 mil insulation boards to get from a service lift down some stairs and 20 mtrs along a corridor I told all five loaders one each or you won’t get them in today about 40 kg but awkward Im 58 so I decided to lead by example We got them all in 7 hours To expensive to leave outside in sunny Burnley One of the lads lent me his steps watch Quite surprised how many steps in a day 1 Link to comment Share on other sites More sharing options...
Dudda Posted May 1, 2020 Share Posted May 1, 2020 If the main goal is to reduce sound then get Gypframe Resilient Bars and fit them to the ceiling first. These are light, easy to fit and readily available. Then fit regular plasterboard to the bars. This will preform much better acoustically than blue acoustic board or thicker boards. However it doesn't matter what type of ceiling you install if you put loads of recessed downlights in the ceiling and make swiss cheese out of it the sound will always travel through the weakest point. 1 Link to comment Share on other sites More sharing options...
MJNewton Posted May 1, 2020 Author Share Posted May 1, 2020 1 hour ago, Dudda said: If the main goal is to reduce sound then get Gypframe Resilient Bars and fit them to the ceiling first. These are light, easy to fit and readily available. Then fit regular plasterboard to the bars. This will preform much better acoustically than blue acoustic board or thicker boards. Hmm.. That was my original plan to be honest but to be honest I got a bit nervous about a method I'd not used before. You think it'd be better then? And by 'regular' boards do you mean 12.5mm? 1 hour ago, Dudda said: However it doesn't matter what type of ceiling you install if you put loads of recessed downlights in the ceiling and make swiss cheese out of it the sound will always travel through the weakest point. There will be five downlights; fireproof fittings though so not completely open like some. Appreciate they will still compromise the acoustic barrier though. Link to comment Share on other sites More sharing options...
Big Jimbo Posted May 1, 2020 Share Posted May 1, 2020 6 hours ago, nod said: It is All the plaster and cement bags where twice as Heavy We used to carry two in when we were loading Now I see young lads wondering upstairs with one 25 kg bag on there shoulder They think I’m being funny telling them to stick another on there shoulder A few month back we had 300 100 mil insulation boards to get from a service lift down some stairs and 20 mtrs along a corridor I told all five loaders one each or you won’t get them in today about 40 kg but awkward Im 58 so I decided to lead by example We got them all in 7 hours To expensive to leave outside in sunny Burnley One of the lads lent me his steps watch Quite surprised how many steps in a day Kin hell. i'm going for a lie down just looking at that. 1 Link to comment Share on other sites More sharing options...
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