jamiehamy Posted February 20, 2017 Posted February 20, 2017 Hiya, We (well, I!) am planning a curved section on an opening in the house. I remember on ebuild a member did this but I can't see the pics. It was his/her type of curved wall I want to do. Iirc the sole plate and wall plates were cut from osb and layered, with 4x2 all the way round. I can't remember how the plaster was moulded - was it cut on one side various times? I've been online and want to avoid wet plasterboard if possible! Thanks, J
Jeremy Harris Posted February 20, 2017 Posted February 20, 2017 Was it done with flexible plasterboard? The flexible stuff bends on one axis enough to get a curve, as long as the radius isn't too tight.
Onoff Posted February 20, 2017 Posted February 20, 2017 The stuff I've seen us only about 6mm thick with grooves on the reverse. I presume you put two layers on?
Jeremy Harris Posted February 20, 2017 Posted February 20, 2017 V-Cut make 12.5mm flexible plasterboard, no idea how much it costs, though. The 6mm stuff you fit as two layers, from what I remember. I can't remember who it was did this, but do recall that it looked pretty good when it was finished.
ProDave Posted February 20, 2017 Posted February 20, 2017 An office I used to work in had this done, a curve around a half landing. A studwork frame was put up, in this case with steel studwork. Sheets of standard plasterboard were left outside leaning against a wall for a few days and watered regularly, and over the course of a few days took on a curve. It was then fitted to the wall while still damp and pliable enough to take the curve they wanted, then left to dry out and skimmed.
Jeremy Harris Posted February 20, 2017 Posted February 20, 2017 2 minutes ago, ProDave said: An office I used to work in had this done, a curve around a half landing. A studwork frame was put up, in this case with steel studwork. Sheets of standard plasterboard were left outside leaning against a wall for a few days and watered regularly, and over the course of a few days took on a curve. It was then fitted to the wall while still damp and pliable enough to take the curve they wanted, then left to dry out and skimmed. That sounds like a very pragmatic way to tackle this! If you could leave the curved wall frames outside you might be able to use them as a mould to get the right curve, but I suspect you don't need to be super accurate, as there will always be a degree of flexibility to play with.
Ferdinand Posted February 20, 2017 Posted February 20, 2017 Curtain wire will give a very natural curve, as a way of creating the original for a template.
ProDave Posted February 20, 2017 Posted February 20, 2017 I also recall they didn't just screw them in place immediately, that would just have burst the screws through wet PB if it was not a tight fit. Rather they wedged it in place with battens and props to let it mould to the shape of the curve before finally screwing it once they were happy it had formed. Yes if you could replicate the curve outside and perhaps leave it lying flat on said curved former it might just curl itself into a perfect fit and be easier.
jamiehamy Posted February 20, 2017 Author Posted February 20, 2017 4 minutes ago, ProDave said: I also recall they didn't just screw them in place immediately, that would just have burst the screws through wet PB if it was not a tight fit. Rather they wedged it in place with battens and props to let it mould to the shape of the curve before finally screwing it once they were happy it had formed. That's just what I was about to ask!
Russell griffiths Posted February 20, 2017 Posted February 20, 2017 http://www.british-gypsum.com/~/media/Files/British-Gypsum/White-Book/White-Book-C05-S04-Specialist-Partitions-GypWall-CURVE.pdf
Onoff Posted February 20, 2017 Posted February 20, 2017 There's this I found: http://vcut.co.uk/services/flexiboard/ Looks like you could end up with a series of facets so would need to skim it?
jamiehamy Posted February 20, 2017 Author Posted February 20, 2017 (edited) I would only need two boards (or three in case of error). Hmm, do I try get hold of three sheets or try the wetting method... Maybe the latter and see how it goes. Edited February 20, 2017 by jamiehamy
Ferdinand Posted February 20, 2017 Posted February 20, 2017 (edited) 3mm (or 5mm) plywood would also be suitable, depending on your radius. And there would perhaps be less time spent about bending it etc. Edited February 20, 2017 by Ferdinand
Nickfromwales Posted February 20, 2017 Posted February 20, 2017 Did this to get a BFO extractor in below pozi-joists. 9mm PB wetted both sides 5 mins before fitting. Internal radius done in 4 pieces. This was in the ensuite upstairs. Formed with 4x2" and double boarded with 4mm ply. I soaked the ply ( dripping wet ) for a couple of hours and then rolled the 2 sheets up then ratchet strapped them overnight to dry. Straps came off and they retained about 50% of the curve so happy days. The PB was special order 6mm and that was wetted both sides and left to stand up against the wall, getting further wetted by brush where I wanted the radius, throughout the day. Just wet it and push against it, leave for an hour and repeat. The weight of the board pushes down and helps. Prop the top of the PB with a dead man ( timber T piece ) so it can't fall over . Easier to do than most think. ? 5
Onoff Posted February 20, 2017 Posted February 20, 2017 I use Lathams for Buffalo board but they do some super flexi ply AND MDF: http://www.lathamtimber.co.uk/products/panels/flexi-products/flexible-plywood
Nickfromwales Posted February 20, 2017 Posted February 20, 2017 Only gripe I had with flexi MDF was getting a fixing in it as screws just blast through it and you get very little purchase. I ended up using my air stapler in the end but it was a curved bath for a display in a bathroom showroom so didn't really have to 'work'. I wouldn't use 'bendy' MDF in a customers house TBH.
Declan52 Posted February 20, 2017 Posted February 20, 2017 I think it was sliders who done a curved wall in his house. Check his blog. http://www.ebuild.co.uk/blog/16/entry-319-wanna-see-a-well-built-stud-take-on-something-curvy/
Temp Posted February 20, 2017 Posted February 20, 2017 Wedi board can also be used for curves but would need a skim coat. http://www.wedi.de/en/area-of-application/processing/designing-constructing/individual-forms-and-curves/ 1
jamiehamy Posted February 20, 2017 Author Posted February 20, 2017 9 hours ago, Declan52 said: I think it was sliders who done a curved wall in his house. Check his blog. http://www.ebuild.co.uk/blog/16/entry-319-wanna-see-a-well-built-stud-take-on-something-curvy/ That's the one - thank you. Last time I looked none of the pictures were available. I'll try get some of that 6mm board and see how it goes. Very similar curve we're looking for.
Onoff Posted February 21, 2017 Posted February 21, 2017 What would the "old school" method have been for a curved wall, vertical laths then plaster?
SteamyTea Posted February 21, 2017 Posted February 21, 2017 21 hours ago, ProDave said: Sheets of standard plasterboard were left outside leaning against a wall for a few days and watered regularly 21 hours ago, JSHarris said: That sounds like a very pragmatic way to tackle this! Could try a wall paper steamer to get some moisture in.
Nickfromwales Posted February 21, 2017 Posted February 21, 2017 10 hours ago, Onoff said: What would the "old school" method have been for a curved wall, vertical laths then plaster? Brick. .
Onoff Posted February 21, 2017 Posted February 21, 2017 5 minutes ago, Nickfromwales said: Brick. . No need to be abusive.....your spelling's cr@p too!
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