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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. |
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#1
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Preventing a crack in a plasterboard ceiling.
As part of a re-furb in the cloakroom - new lighting and different
plumbing, I'll have to replace the plasterboard ceiling. Approximately 1.4 x 1.2 meters. Joists along the major axis. About half way along those, the ceiling changes to a slope - part of the original roof design. So the joint in the pb at the bend at right angles to the joists. And the old was cracked there - despite not being that old. What was a sloping roof above is now a roof terrace, and IIRC the joists for that not connected to this ceiling ones. What would be the best way to avoid the new cracking? Suppose I could fit noggins to support the ends. I don't intend having it skimmed, as that would require trades brought in. (The old was skimmed but cracked anyway.) -- *Women like silent men; they think they're listening. Dave Plowman London SW To e-mail, change noise into sound. |
#2
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Preventing a crack in a plasterboard ceiling.
On Monday, 26 October 2020 at 14:21:25 UTC, Dave Plowman (News) wrote:
As part of a re-furb in the cloakroom - new lighting and different plumbing, I'll have to replace the plasterboard ceiling. Approximately 1.4 x 1.2 meters. Joists along the major axis. About half way along those, the ceiling changes to a slope - part of the original roof design. So the joint in the pb at the bend at right angles to the joists. And the old was cracked there - despite not being that old.. What was a sloping roof above is now a roof terrace, and IIRC the joists for that not connected to this ceiling ones. What would be the best way to avoid the new cracking? Suppose I could fit noggins to support the ends. I don't intend having it skimmed, as that would require trades brought in. (The old was skimmed but cracked anyway.) -- *Women like silent men; they think they're listening. Dave Plowman London SW To e-mail, change noise into sound. Noggins will certainly help. As you do not intend to skim, presumably you are going to use drywall filler on all the joints in that case joint tape will prevent cracking. Apply a thin coat of filler either side of the joint press the joint tape into the filler with scraper then overfill the joint and tape. Allow to set then apply final coat of filler feathering it out for at least 150mm each side of the joint. Richard |
#3
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Preventing a crack in a plasterboard ceiling.
On 26/10/2020 15:41, Tricky Dicky wrote:
On Monday, 26 October 2020 at 14:21:25 UTC, Dave Plowman (News) wrote: As part of a re-furb in the cloakroom - new lighting and different plumbing, I'll have to replace the plasterboard ceiling. Approximately 1.4 x 1.2 meters. Joists along the major axis. About half way along those, the ceiling changes to a slope - part of the original roof design. So the joint in the pb at the bend at right angles to the joists. And the old was cracked there - despite not being that old. What was a sloping roof above is now a roof terrace, and IIRC the joists for that not connected to this ceiling ones. What would be the best way to avoid the new cracking? Suppose I could fit noggins to support the ends. I don't intend having it skimmed, as that would require trades brought in. (The old was skimmed but cracked anyway.) -- *Women like silent men; they think they're listening. Dave Plowman London SW To e-mail, change noise into sound. Noggins will certainly help. As you do not intend to skim, presumably you are going to use drywall filler on all the joints in that case joint tape will prevent cracking. Apply a thin coat of filler either side of the joint press the joint tape into the filler with scraper then overfill the joint and tape. Allow to set then apply final coat of filler feathering it out for at least 150mm each side of the joint. Richard +1 Paper tape and plasterboard joint filler I've been using this on some ceilings over-boarded with plasterboard and then (paper) taped https://tinyurl.com/yym7re4t Note the powder takes a lot more water than you first think, mix well and leave for a few minutes before deciding that the mix is correct. It appers that ready mix jointing compound in a tub ALWAYS requires extra water and thoroughly re-mixing to knock out the air in order to get the best results. Probably going to the extreme with specialised tape. https://www.youtube.com/watch?v=65Id0fuTCj0 The Vancover Carpenters Youtube drywall "mudding" (covering joins) videos are quite good. There are a lot of them. -- mailto : news {at} admac {dot} myzen {dot} co {dot} uk |
#4
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Preventing a crack in a plasterboard ceiling.
alan_m wrote:
+1 Paper tape and plasterboard joint filler I prefer the fibreglass mesh tape. |
#5
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Preventing a crack in a plasterboard ceiling.
On 26 Oct 2020 at 16:05:59 GMT, "alan_m" wrote:
On 26/10/2020 15:41, Tricky Dicky wrote: On Monday, 26 October 2020 at 14:21:25 UTC, Dave Plowman (News) wrote: As part of a re-furb in the cloakroom - new lighting and different plumbing, I'll have to replace the plasterboard ceiling. Approximately 1.4 x 1.2 meters. Joists along the major axis. About half way along those, the ceiling changes to a slope - part of the original roof design. So the joint in the pb at the bend at right angles to the joists. And the old was cracked there - despite not being that old. What was a sloping roof above is now a roof terrace, and IIRC the joists for that not connected to this ceiling ones. What would be the best way to avoid the new cracking? Suppose I could fit noggins to support the ends. I don't intend having it skimmed, as that would require trades brought in. (The old was skimmed but cracked anyway.) -- *Women like silent men; they think they're listening. Dave Plowman London SW To e-mail, change noise into sound. Noggins will certainly help. As you do not intend to skim, presumably you are going to use drywall filler on all the joints in that case joint tape will prevent cracking. Apply a thin coat of filler either side of the joint press the joint tape into the filler with scraper then overfill the joint and tape. Allow to set then apply final coat of filler feathering it out for at least 150mm each side of the joint. Richard +1 Paper tape and plasterboard joint filler I've been using this on some ceilings over-boarded with plasterboard and then (paper) taped https://tinyurl.com/yym7re4t Note the powder takes a lot more water than you first think, mix well and leave for a few minutes before deciding that the mix is correct. It appers that ready mix jointing compound in a tub ALWAYS requires extra water and thoroughly re-mixing to knock out the air in order to get the best results. Probably going to the extreme with specialised tape. https://www.youtube.com/watch?v=65Id0fuTCj0 The Vancover Carpenters Youtube drywall "mudding" (covering joins) videos are quite good. There are a lot of them. (Even) I had some success replacing the boards to a water damaged wall and ceiling. I used pre-mixed, and didn't need to dilute it, and a key tool seemed to be the special 'spreader' - thin, wide and bendy. -- Cheers, Rob |
#6
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Preventing a crack in a plasterboard ceiling.
On 26/10/2020 16:10, Andy Burns wrote:
alan_m wrote: +1 Paper tape and plasterboard joint filler I prefer the fibreglass mesh tape. Many youtube videos indicate for corners paper is always used. For patching flat walls etc. (where no movement is expected) mesh can be used. Before I embarked on re-boarding a couple of ceilings I watched a LOT of youtube videos on "drywall" and jointing including quite a few on the mesh vs paper Just search Youtube for mesh vs paper Example: (on of many on a similar theme) https://www.youtube.com/watch?v=VhsbU6lTrnM -- mailto : news {at} admac {dot} myzen {dot} co {dot} uk |
#7
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Preventing a crack in a plasterboard ceiling.
On 26 Oct 2020 at 17:21:39 GMT, "alan_m" wrote:
On 26/10/2020 16:10, Andy Burns wrote: alan_m wrote: +1 Paper tape and plasterboard joint filler I prefer the fibreglass mesh tape. Many youtube videos indicate for corners paper is always used. For patching flat walls etc. (where no movement is expected) mesh can be used. I used paper for the corners and flat panels - worked fine. The V seemed to give a nice bed for the filler. -- Cheers, Rob |
#8
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Preventing a crack in a plasterboard ceiling.
alan_m wrote:
On 26/10/2020 16:10, Andy Burns wrote: alan_m wrote: +1 Paper tape and plasterboard joint filler I prefer the fibreglass mesh tape. Many youtube videos indicate for corners paper is always used. you're right, I was forgetting Dave's join is at an angle. for that I use a paper tape with metal strip, similar to this. https://www.toolstation.com/plasterboard-corner-tape/p10867 |
#9
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Preventing a crack in a plasterboard ceiling.
On 26/10/2020 14:12, Dave Plowman (News) wrote:
What would be the best way to avoid the new cracking? Suppose I could fit noggins to support the ends. I don't intend having it skimmed, as that would require trades brought in. (The old was skimmed but cracked anyway.) A photo may help but stopping one side of a join moving with respect to the other side with noggins or a strip of wood would help prevent cracking. Also pre-filling any largish void in the join before taping helps. Was there any tape beneath the skim plaster? Plasterboard (USA drywall) jointing compound is very easy to sand but try to get a decent finish when applying compound and avoid a LOT of dust later. Based on my experiences.... https://www.screwfix.com/p/ph2-drywa...2-2-pack/6623v Plasterboard screws should not penetrate through the paper. The bits above in a power tool stop the screw going too far in. Otherwise drive the screw most of the way in with a power tool and then use a manual screwdriver to finally tighten the screw so it's just below the surface of the board. To fill any screw holes apply the compound in one direction and immediately wipe of any excess in another direction. It usually takes 2 or 3 applications to fully hide a screw head if not skimming. Let the compound dry between applications. A proper jointing knife helps a lot https://www.screwfix.com/p/forge-ste...-6-152mm/7738c these blades have a lot more flexible than a blade perhaps used for stripping wallpaper etc. The flexible blade helps with feathering edges. Note these high carbon steel blades can rust easily so after use and cleaning dry immediately with a cloth or kitchen towel. -- mailto : news {at} admac {dot} myzen {dot} co {dot} uk |
#10
Posted to uk.d-i-y
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Preventing a crack in a plasterboard ceiling.
On Monday, 26 October 2020 14:21:25 UTC, Dave Plowman (News) wrote:
As part of a re-furb in the cloakroom - new lighting and different plumbing, I'll have to replace the plasterboard ceiling. Approximately 1.4 x 1.2 meters. Joists along the major axis. About half way along those, the ceiling changes to a slope - part of the original roof design. So the joint in the pb at the bend at right angles to the joists. And the old was cracked there - despite not being that old. What was a sloping roof above is now a roof terrace, and IIRC the joists for that not connected to this ceiling ones. What would be the best way to avoid the new cracking? Suppose I could fit noggins to support the ends. I don't intend having it skimmed, as that would require trades brought in. (The old was skimmed but cracked anyway.) Scrim over the joint. Retrofit on existing plaster by grinding away the plaster on either side of the joint, Apply the scrim with Polyfilla of similar. https://www.randjbuildershardware.co...astering-tool/ |
#11
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Preventing a crack in a plasterboard ceiling.
alan_m Wrote in message:
On 26/10/2020 16:10, Andy Burns wrote: alan_m wrote: +1 Paper tape and plasterboard joint filler I prefer the fibreglass mesh tape. Many youtube videos indicate for corners paper is always used. For patching flat walls etc. (where no movement is expected) mesh can be used. Before I embarked on re-boarding a couple of ceilings I watched a LOT of youtube videos on "drywall" and jointing including quite a few on the mesh vs paper Just search Youtube for mesh vs paper Example: (on of many on a similar theme) https://www.youtube.com/watch?v=VhsbU6lTrnM "Quick set mud" "air dry mud" ? Muricans. I'll stick w fibreglass mesh. -- Jimk ----Android NewsGroup Reader---- http://usenet.sinaapp.com/ |
#12
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Preventing a crack in a plasterboard ceiling.
On 27/10/2020 13:19, Jimk wrote:
"Quick set mud" "air dry mud" ? Muricans. Wrong I'll stick w fibreglass mesh. Good idea - just because you object to Canadian terminology you stick to something that is difficult to use in corners and probably will not work to prevent cracks. -- mailto : news {at} admac {dot} myzen {dot} co {dot} uk |
#13
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Preventing a crack in a plasterboard ceiling.
alan_m Wrote in message:
On 27/10/2020 13:19, Jimk wrote: "Quick set mud" "air dry mud" ? Muricans. Wrong I'll stick w fibreglass mesh. Good idea - just because you object to Canadian terminology you stick to something that is difficult to use in corners and probably will not work to prevent cracks. And you use air dry or quick set mud? Fibreglass mesh has always worked for me with UK plasters, why change on basis of an inappropriate amateur yt video & someone who doesn't understand the difference? -- Jimk ----Android NewsGroup Reader---- http://usenet.sinaapp.com/ |
#14
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Preventing a crack in a plasterboard ceiling.
On Tuesday, 27 October 2020 at 15:12:15 UTC, JimK wrote:
alan_m Wrote in message: On 27/10/2020 13:19, Jimk wrote: "Quick set mud" "air dry mud" ? Muricans. Wrong I'll stick w fibreglass mesh. Good idea - just because you object to Canadian terminology you stick to something that is difficult to use in corners and probably will not work to prevent cracks. And you use air dry or quick set mud? Fibreglass mesh has always worked for me with UK plasters, why change on basis of an inappropriate amateur yt video & someone who doesn't understand the difference? -- Jimk ----Android NewsGroup Reader---- http://usenet.sinaapp.com/ Fibreglass mesh or paper tape will both do the same thing. The advantage of the paper tape especially the type with the two metal strips is that it will produce a defined crease at the joint. Richard |
#15
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Preventing a crack in a plasterboard ceiling.
Tricky Dicky Wrote in message:
On Tuesday, 27 October 2020 at 15:12:15 UTC, JimK wrote: alan_m Wrote in message: On 27/10/2020 13:19, Jimk wrote: "Quick set mud" "air dry mud" ? Muricans. Wrong I'll stick w fibreglass mesh. Good idea - just because you object to Canadian terminology you stick to something that is difficult to use in corners and probably will not work to prevent cracks. And you use air dry or quick set mud? Fibreglass mesh has always worked for me with UK plasters, why change on basis of an inappropriate amateur yt video & someone who doesn't understand the difference? -- Jimk ----Android NewsGroup Reader---- http://usenet.sinaapp.com/ Fibreglass mesh or paper tape will both do the same thing. The advantage of the paper tape especially the type with the two metal strips is that it will produce a defined crease at the joint. Richard Never wished I'd had it.... -- Jimk ----Android NewsGroup Reader---- http://usenet.sinaapp.com/ |
#16
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Preventing a crack in a plasterboard ceiling.
On 27/10/2020 15:12, Jimk wrote:
alan_m Wrote in message: On 27/10/2020 13:19, Jimk wrote: "Quick set mud" "air dry mud" ? Muricans. Wrong I'll stick w fibreglass mesh. Good idea - just because you object to Canadian terminology you stick to something that is difficult to use in corners and probably will not work to prevent cracks. And you use air dry or quick set mud? Fibreglass mesh has always worked for me with UK plasters, why change on basis of an inappropriate amateur yt video & someone who doesn't understand the difference? It's not plaster and the OP expressed a wish not to plaster. You don't have to skim plasterboard. -- mailto : news {at} admac {dot} myzen {dot} co {dot} uk |
#17
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Preventing a crack in a plasterboard ceiling.
alan_m Wrote in message:
On 27/10/2020 15:12, Jimk wrote: alan_m Wrote in message: On 27/10/2020 13:19, Jimk wrote: "Quick set mud" "air dry mud" ? Muricans. Wrong I'll stick w fibreglass mesh. Good idea - just because you object to Canadian terminology you stick to something that is difficult to use in corners and probably will not work to prevent cracks. And you use air dry or quick set mud? Fibreglass mesh has always worked for me with UK plasters, why change on basis of an inappropriate amateur yt video & someone who doesn't understand the difference? It's not plaster and the OP expressed a wish not to plaster. You don't have to skim plasterboard. Again what "mud" you using? Gyproc? So Gypsum based? Like plaster?..... I'd still use mesh, once it's in & set how's it ever going to 'twist & shear' & allow cracks more than a bit of paper?? -- Jimk ----Android NewsGroup Reader---- http://usenet.sinaapp.com/ |
#18
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Preventing a crack in a plasterboard ceiling.
On 27/10/2020 18:58, Jimk wrote:
Again what "mud" you using? Gyproc? So Gypsum based? Like plaster?..... I'd still use mesh, once it's in & set how's it ever going to 'twist & shear' & allow cracks more than a bit of paper?? British Gypsum also recommend paper for corner joints and other joints. They state that their mesh tape is doesn't provide the same level of crack resistance as their their paper tape. -- mailto : news {at} admac {dot} myzen {dot} co {dot} uk |
#19
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Preventing a crack in a plasterboard ceiling.
On 27/10/2020 19:46, Jimk wrote:
Which "mud" do you use ? (3rd time of asking, is it a guilty secret?) Ive already posted that information. -- mailto : news {at} admac {dot} myzen {dot} co {dot} uk |
#20
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Preventing a crack in a plasterboard ceiling.
alan_m Wrote in message:
On 27/10/2020 18:58, Jimk wrote: Again what "mud" you using? Gyproc? So Gypsum based? Like plaster?..... I'd still use mesh, once it's in & set how's it ever going to 'twist & shear' & allow cracks more than a bit of paper?? British Gypsum also recommend paper for corner joints and other joints. They state that their mesh tape is doesn't provide the same level of crack resistance as their their paper tape. Gorra link? They sell both IIRC, I've always been ok with fibreglass mesh tapes, I can kind of fold it over a trowel for long enough to get it stuck in place in corners. Which "mud" do you use ? (3rd time of asking, is it a guilty secret?) -- Jimk ----Android NewsGroup Reader---- http://usenet.sinaapp.com/ |
#21
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Preventing a crack in a plasterboard ceiling.
alan_m Wrote in message:
On 27/10/2020 19:46, Jimk wrote: Which "mud" do you use ? (3rd time of asking, is it a guilty secret?) Ive already posted that information. Is it air dry or quick set though? You haven't answered that have you? Look forward to the British Gypsum link ... -- Jimk ----Android NewsGroup Reader---- http://usenet.sinaapp.com/ |
#22
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Preventing a crack in a plasterboard ceiling.
On 27/10/2020 19:53, Jimk wrote:
alan_m Wrote in message: On 27/10/2020 19:46, Jimk wrote: Which "mud" do you use ? (3rd time of asking, is it a guilty secret?) Ive already posted that information. Is it air dry or quick set though? You haven't answered that have you? Combined air-drying and setting compound, workable for around 60 minutes. Another coat can be applied after around 4 hours but if sanding is required between coats then it needs to be dry before another coat. Look forward to the British Gypsum link ... https://youtu.be/B1G-KaeQgC8?t=103 https://www.british-gypsum.com/produ...protape?tab0=0 Quote:
https://www.british-gypsum.com/~/med...le-ProTape.pdf Quote:
-- mailto : news {at} admac {dot} myzen {dot} co {dot} uk |
#23
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Preventing a crack in a plasterboard ceiling.
alan_m Wrote in message:
On 27/10/2020 19:53, Jimk wrote: alan_m Wrote in message: On 27/10/2020 19:46, Jimk wrote: Which "mud" do you use ? (3rd time of asking, is it a guilty secret?) Ive already posted that information. Is it air dry or quick set though? You haven't answered that have you? Combined air-drying and setting compound, workable for around 60 minutes. Another coat can be applied after around 4 hours but if sanding is required between coats then it needs to be dry before another coat. Look forward to the British Gypsum link ... https://youtu.be/B1G-KaeQgC8?t=103 https://www.british-gypsum.com/produ...protape?tab0=0 Quote:
Note: no mention of inside corners. https://www.british-gypsum.com/~/med...le-ProTape.pdf Quote:
Note: Gyproc Joint Tape is their paper tape. Oh well each to their own... -- Jimk ----Android NewsGroup Reader---- http://usenet.sinaapp.com/ |
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