How to make a rounded bend

Score half inch lines down the plasterboard with a stanley knife(don't cut through the board)and then snap open the score lines.

Try a small piece of scrap PB to get the idea.

Just score several parallel lines down the board where you want the curve then skim over.

================== Flexible plasterboard is available but not widely stocked. Ask your local builders' merchants to get it for you.

Alternatively, if you're doing a studded wall do a short section of 'lath and plaster' to achieve the curve. You could use either traditional wooden laths or more modern expanded metalmesh.

Cic.

In my Victorian house it's a pre-cast bit in white plaster. The original L&P has been replaced with plasterboard before I bought it but they kept this moulding.

So its just the same as you would do with a skirting board then. Thanks everyone.

We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember Cyberdog saying something like:

Stop the plasterboard short on each side of the bend and create the bend using 3mm ply and blend in.

Plaster doesn't adhere to thin ply due to the nature of it swelling and contracting in different climates.

Yup.

There is flexible-mdf in B&Q which can curve quite impressively.

For plasterboard, the other suggestions are fine but one of the DIY programmes on telly showed the fellow leaving the plasterboard outside at an angle of (say)

HTH

Mungo

The message from "Mungo" contains these words:

It's only a 3" curve!

Mum's house has this on the corner of the wall in the corridor - she asked for it when the house was only about 2 bricks high so she could get her wheelchair round the corner more easily. The builder obliged (block walls, just hacked the corners off with a saw and plastered it round - looks fine and has lasted 20 years so far) and reckoned it made the place look so much bigger he'd do it to all such corners now.

We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember "The3rd Earl Of Derby" saying something like:

Thin MDF, then. That definitely works - I've seen it done successfully.

Why, I wonder?

It won't sit easily with plaster.

That will work well for a large radius, but this is a small radius, I doubt you'd do it quickly, probably at all.

IIW the OP I'd go up to the edge with PB, then PVA and form the curve with one-coat, before the PVA dries.

Also, butchering PB to fit that small radius will not leave any strength, which might be important at a corner.

Fix some pre-bent EML to the corner then fill it with bonding, using a template to maintain the curve.

Why not just skim over the old wall with finishing plaster instead of putting up plasterboard and keep the moulding that way?

Would it be possible to 'set in' a piece of the larger 3 or 4 inch coving vertically. It is thinner than 12mm plasterboard at the edges but a thin piece of strip wood may get the two surfaces to align. Then just fill and skim.

Chris.

Would it be possible to 'set in' a piece of the larger 3 or 4 inch coving vertically. It is thinner than 12mm plasterboard at the edges but a thin piece of strip wood may get the two surfaces to align. Then just fill and skim.

Chris.

Because it is a very old house. I pulled the paper off the other day and all the skimming came with it. Then when I looked at the undercoat is it is very loose in most places and very powdery in others.