Home |
Search |
Today's Posts |
|
UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
|
#1
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
Hi,
I've been retrofitting celotex to a room. It's gone well except for one slight problem: the window reveal (I put 25mm celotex inside the reveal). I'm worried that even if I use 9.5mm, rather than 12.5mm, plasterboard on top of the celotex that it might overlap too much of the side of the window frame. I'm not sure how much of a problem this will be: any overlap will only be cosmetic, it's not going to block the window or prevent it opening or anything that drastic but will it look "odd"? What would you do? Use 9.5mm PB? If there is an overlap (i) it will probably be hidden by blinds/curtains/whatever SWMBO puts there or (ii) if we do see it, we may grow used to it. Alternatively is there something thinner than 9.5mm PB? I don't expect there is a plasterboard any thinner because it would be too fragile to transport but can you plaster on top of say hardboard? Does it need any treatment first (primer? undercoat?) or just PVA? Or can you PVA celotex and plaster directly on to that? TIA |
#2
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
On 24 July, 21:57, Fred wrote:
Hi, I've been retrofitting celotex to a room. It's gone well except for one slight problem: the window reveal (I put 25mm celotex inside the reveal). I'm worried that even if I use 9.5mm, rather than 12.5mm, plasterboard on top of the celotex that it might overlap too much of the side of the window frame. I'm not sure how much of a problem this will be: any overlap will only be cosmetic, it's not going to block the window or prevent it opening or anything that drastic but will it look "odd"? What would you do? Use 9.5mm PB? If there is an overlap (i) it will probably be hidden by blinds/curtains/whatever SWMBO puts there or (ii) if we do see it, we may grow used to it. Alternatively is there something thinner than 9.5mm PB? I don't expect there is a plasterboard any thinner because it would be too fragile to transport but can you plaster on top of say hardboard? Does it need any treatment first (primer? undercoat?) or just PVA? Or can you PVA celotex and plaster directly on to that? TIA just buy a moulding to extend the winda frame? Cheers Jim K |
#3
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
Jim K wrote:
On 24 July, 21:57, Fred wrote: Hi, I've been retrofitting celotex to a room. It's gone well except for one slight problem: the window reveal (I put 25mm celotex inside the reveal). I'm worried that even if I use 9.5mm, rather than 12.5mm, plasterboard on top of the celotex that it might overlap too much of the side of the window frame. I'm not sure how much of a problem this will be: any overlap will only be cosmetic, it's not going to block the window or prevent it opening or anything that drastic but will it look "odd"? What would you do? Use 9.5mm PB? If there is an overlap (i) it will probably be hidden by blinds/curtains/whatever SWMBO puts there or (ii) if we do see it, we may grow used to it. Alternatively is there something thinner than 9.5mm PB? I don't expect there is a plasterboard any thinner because it would be too fragile to transport but can you plaster on top of say hardboard? Does it need any treatment first (primer? undercoat?) or just PVA? Or can you PVA celotex and plaster directly on to that? TIA just buy a moulding to extend the winda frame? How is he going to do that? - he'd have to replace the glass units. -- Phil L RSRL Tipster Of The Year 2008 |
#4
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
On Jul 24, 9:57*pm, Fred wrote:
Hi, I've been retrofitting celotex to a room. It's gone well except for one slight problem: the window reveal (I put 25mm celotex inside the reveal). I'm worried that even if I use 9.5mm, rather than 12.5mm, plasterboard on top of the celotex that it might overlap too much of the side of the window frame. I'm not sure how much of a problem this will be: any overlap will only be cosmetic, it's not going to block the window or prevent it opening or anything that drastic but will it look "odd"? What would you do? Use 9.5mm PB? If there is an overlap (i) it will probably be hidden by blinds/curtains/whatever SWMBO puts there or (ii) if we do see it, we may grow used to it. Alternatively is there something thinner than 9.5mm PB? I don't expect there is a plasterboard any thinner because it would be too fragile to transport but can you plaster on top of say hardboard? Does it need any treatment first (primer? undercoat?) or just PVA? Or can you PVA celotex and plaster directly on to that? TIA 6mm plasterboard does exist, although probably a special order so may not be a solution. It's fibreglass reinforced I think, and designed for boarding curves. I would have used an insulated plasterboard - something like the Knauf Thermal Laminate Plus at 27mm total thickness. Alternatively, you could cover the insulation with metal lath, eg http://www.diy.com/diy/jsp/bq/nav.js...h=lath&x=0&y=0 and then plaster. Not sure what thickness you'd end up with, but probably less than plasterboard. A |
#5
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
On Sun, 25 Jul 2010 01:05:42 -0700 (PDT), andrew
wrote: I would have used an insulated plasterboard - something like the Knauf Thermal Laminate Plus at 27mm total thickness. That would have been ideal, what a shame I didn't know about it when I began! I'll have to phone around to see who stocks 6mm plasterboard tomorrow. I think only Lafarge make it. Thanks. |
#6
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
In article , Fred
writes On Sun, 25 Jul 2010 01:05:42 -0700 (PDT), andrew wrote: I would have used an insulated plasterboard - something like the Knauf Thermal Laminate Plus at 27mm total thickness. That would have been ideal, what a shame I didn't know about it when I began! I'll have to phone around to see who stocks 6mm plasterboard tomorrow. I think only Lafarge make it. It hardly seems worth the effort to save 3mm. You could face the insulation with 3mm ply and finish it as you had planned for the PB, either paint or paper. If you decide to paint it you can leave it looking like wood or fill the grain with board filler or even polyfilla to leave a plaster smooth finish that can be primed then emulsioned. In the latter case it's not a skim coat you are applying, it is just enough to fill the grain so is nominally zero thickness. You could put thinner insulation in the reveals, it would make little difference to the overall heat loss as the area involved is small but could help avoid local condensation. To avoid buying a full sheet of thinner stuff I have sawn small lengths of PIR foam in half depth wise but you wouldn't want to do a lot of it. You could use a layer or 2 of polystyrene tiles instead of PIR with some loss in efficacy but I don't think that's a big issue. -- fred FIVE TV's superbright logo - not the DOG's, it's ******** |
#7
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
On Jul 24, 9:57*pm, Fred wrote:
I've been retrofitting celotex to a room. It's gone well except for one slight problem: the window reveal (I put 25mm celotex inside the reveal). AFAIK industry practice is... - 12mm Celotex with 9mm PB over the top - 20mm Polystyrene + PVA + plaster skim You can use Marmox 6mm 10mm 12.5mm 20mm... - Cement & glass-fibre mesh on extruded polystyrene + plaster skim Marmox is actually better than expanded polystyrene re waterproof. |
#8
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
Fred wrote:
Hi, I've been retrofitting celotex to a room. It's gone well except for one slight problem: the window reveal (I put 25mm celotex inside the reveal). I'm worried that even if I use 9.5mm, rather than 12.5mm, plasterboard on top of the celotex that it might overlap too much of the side of the window frame. I'm not sure how much of a problem this will be: any overlap will only be cosmetic, it's not going to block the window or prevent it opening or anything that drastic but will it look "odd"? What would you do? Use 9.5mm PB? If there is an overlap (i) it will probably be hidden by blinds/curtains/whatever SWMBO puts there or (ii) if we do see it, we may grow used to it. Alternatively is there something thinner than 9.5mm PB? I don't expect there is a plasterboard any thinner because it would be too fragile to transport but can you plaster on top of say hardboard? Does it need any treatment first (primer? undercoat?) or just PVA? Or can you PVA celotex and plaster directly on to that? TIA Have you took off the old plaster down to bare brick? - you'll gain up to 25mm there. -- Phil L RSRL Tipster Of The Year 2008 |
#9
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
On Sun, 25 Jul 2010 16:21:09 +0100, "Phil L"
wrote: Have you took off the old plaster down to bare brick? Yes. |
#10
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
In article ,
Fred writes: Hi, I've been retrofitting celotex to a room. It's gone well except for one slight problem: the window reveal (I put 25mm celotex inside the reveal). I'm worried that even if I use 9.5mm, rather than 12.5mm, plasterboard on top of the celotex that it might overlap too much of the side of the window frame. I'm not sure how much of a problem this will be: any overlap will only be cosmetic, it's not going to block the window or prevent it opening or anything that drastic but will it look "odd"? What would you do? Use 9.5mm PB? If there is an overlap (i) it will probably be hidden by blinds/curtains/whatever SWMBO puts there or (ii) if we do see it, we may grow used to it. Alternatively is there something thinner than 9.5mm PB? I don't expect there is a plasterboard any thinner because it would be too fragile to transport but can you plaster on top of say hardboard? Does it need any treatment first (primer? undercoat?) or just PVA? Or can you PVA celotex and plaster directly on to that? Yes. You might want a scratch coat (use bonding coat plaster) as finish coat by itself might be a bit fragile on celotex. You can plaster a sheet of glass if you PVA it first. -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
#11
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
Andrew Gabriel wrote:
In article , Fred writes: Hi, I've been retrofitting celotex to a room. It's gone well except for one slight problem: the window reveal (I put 25mm celotex inside the reveal). I'm worried that even if I use 9.5mm, rather than 12.5mm, plasterboard on top of the celotex that it might overlap too much of the side of the window frame. I'm not sure how much of a problem this will be: any overlap will only be cosmetic, it's not going to block the window or prevent it opening or anything that drastic but will it look "odd"? What would you do? Use 9.5mm PB? If there is an overlap (i) it will probably be hidden by blinds/curtains/whatever SWMBO puts there or (ii) if we do see it, we may grow used to it. Alternatively is there something thinner than 9.5mm PB? I don't expect there is a plasterboard any thinner because it would be too fragile to transport but can you plaster on top of say hardboard? Does it need any treatment first (primer? undercoat?) or just PVA? Or can you PVA celotex and plaster directly on to that? Yes. You might want a scratch coat (use bonding coat plaster) as finish coat by itself might be a bit fragile on celotex. You can plaster a sheet of glass if you PVA it first. you could use rendering mesh and bonding plaster for a really thin finish. |
#12
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
In article ,
The Natural Philosopher writes: Andrew Gabriel wrote: In article , Fred writes: Hi, I've been retrofitting celotex to a room. It's gone well except for one slight problem: the window reveal (I put 25mm celotex inside the reveal). I'm worried that even if I use 9.5mm, rather than 12.5mm, plasterboard on top of the celotex that it might overlap too much of the side of the window frame. I'm not sure how much of a problem this will be: any overlap will only be cosmetic, it's not going to block the window or prevent it opening or anything that drastic but will it look "odd"? What would you do? Use 9.5mm PB? If there is an overlap (i) it will probably be hidden by blinds/curtains/whatever SWMBO puts there or (ii) if we do see it, we may grow used to it. Alternatively is there something thinner than 9.5mm PB? I don't expect there is a plasterboard any thinner because it would be too fragile to transport but can you plaster on top of say hardboard? Does it need any treatment first (primer? undercoat?) or just PVA? Or can you PVA celotex and plaster directly on to that? Yes. You might want a scratch coat (use bonding coat plaster) as finish coat by itself might be a bit fragile on celotex. You can plaster a sheet of glass if you PVA it first. you could use rendering mesh and bonding plaster for a really thin finish. It's called metal lath. You would want stainless steel, not galvanised, near a window, and stainless steel fixings. It's a complete ******* to handle. Comes in 8'x3' sheets, and every edge is like a giant razor blade, and even the surface is like a giant cheese grater. I used some a few months ago, and in spite of being careful, I still managed to cut myself several times. You don't even know you've done it, as mostly it's completely painless at the time. Then you notice things are getting blood on them, and you've got blood on your hands, and you start trying to work out where it's coming from. It's probably a bit thick for what you want, and it doesn't necessarily lay very flat against the surface, so I'm not sure you'd achieve significantly less than 9mm with it. Another option I have used for a thin layer is fine welded mesh. That came from Wickes, but is galvanised rather than S/S. I don't recall if they or anyone else does a S/S version. It is much easier to handle. -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
#13
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
|
#14
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
In article ,
Fred writes: BTW I have bought a couple of angle beads to use. Do you hold these in place with a couple of plasterboard screws, glue (no more tails type of thing), or just push them into the wet plaster? Plaster board beads - I just run some plaster up the back, and then push on to the plasterboard, and plaster should ooze through the slots. If the beads or the edge are not flat, you might need a screw or nail. Again, should really use non-rusting ones, as if it ever gets damp, you can get rust marks coming through the paintwork. -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
#15
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
replying to Fred, Mario Toro Paz wrote:
you could use 6mm mdf -- for full context, visit http://www.homeownershub.com/uk-diy/...te-645810-.htm |
#16
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
On Friday, 9 September 2016 12:44:04 UTC+1, Mario Toro Paz wrote:
replying to Fred, Mario Toro Paz wrote: you could use 6mm mdf that'll be useful, 6 years later. try this http://wiki.diyfaq.org.uk/index.php/Home_owners_hub NT |
#17
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
|
#18
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
On 09/09/2016 14:33, Andy Burns wrote:
wrote: Mario Toro Paz wrote: you could use 6mm mdf try this http://wiki.diyfaq.org.uk/index.php/xxxxxxxxxxxx Hxxxx oxxxxx hub seems to filter out all messages mentioning its name, so Mario is unlikely to see your helpful link That's a shame. I've even tried to create an account there, but the site won't allow for a legal "_" in a name! |
#19
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
Fredxxx wrote:
Andy Burns wrote: wrote: http://wiki.diyfaq.org.uk/index.php/xxxxxxxxxxxx Hxxxx oxxxxx hub seems to filter out all messages mentioning its name, so Mario is unlikely to see your helpful link That's a shame. Actually it seems to be playing catch-up, NT's and my message have shown there now, yours not yet, I guess an underscore or a space is enough to fool their filter. |
#20
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
On 09/09/16 12:44, Mario Toro Paz wrote:
replying to Fred, Mario Toro Paz wrote: you could use 6mm mdf you could expanded metal mesh, or lath... -- Canada is all right really, though not for the whole weekend. "Saki" |
#21
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
On Saturday, 24 July 2010 21:57:57 UTC+1, Fred wrote:
Hi, I've been retrofitting celotex to a room. It's gone well except for one slight problem: the window reveal (I put 25mm celotex inside the reveal). I'm worried that even if I use 9.5mm, rather than 12.5mm, plasterboard on top of the celotex that it might overlap too much of the side of the window frame. I'm not sure how much of a problem this will be: any overlap will only be cosmetic, it's not going to block the window or prevent it opening or anything that drastic but will it look "odd"? What would you do? Use 9.5mm PB? If there is an overlap (i) it will probably be hidden by blinds/curtains/whatever SWMBO puts there or (ii) if we do see it, we may grow used to it. Alternatively is there something thinner than 9.5mm PB? I don't expect there is a plasterboard any thinner because it would be too fragile to transport but can you plaster on top of say hardboard? Does it need any treatment first (primer? undercoat?) or just PVA? Or can you PVA celotex and plaster directly on to that? TIA Or, I have removed the foil and used plaster and PVA to put a thin skim of plaster direct onto the foam. No problems so far, five years ago. |
#22
Posted to uk.d-i-y
|
|||
|
|||
thinnest plasterboard or other plaster substrate?
In article ,
harry writes: On Saturday, 24 July 2010 21:57:57 UTC+1, Fred wrote: Or can you PVA celotex and plaster directly on to that? Yes, you can even PVA glass and plaster onto that. Or, I have removed the foil and used plaster and PVA to put a thin skim of plaster direct onto the foam. No problems so far, five years ago. It is also manufactured without foil on one or both sides, although finding a reseller might be a challenge. -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Plasterboard for previous contaminated plaster | UK diy | |||
Plasterboard V's plaster | UK diy | |||
Plasterboard then PVA then skim plaster? | UK diy | |||
plasterboard onto old plaster? | UK diy | |||
Merging plaster & plasterboard ? | UK diy |