Could I replaster this corner myself?

[KeepinOn]

And reaffix the skirting, as well as a length of picture rail?

We've pulled out a fitted cupboard to find a growing mould problem, due to ruined flashing between the outside wall and the flat carport roof. This flashing is being repaired as I type! So the mould will be sorted from now on.

But the plaster in the corner there is damp and coming away from the brick. I am assuming it will need to be taken off completely and allowed to dry for a few weeks before we can do anything else with it.

How hard would it be to fix myself? Or am I being naiive and just need to get a plasterer in?

Easily done and I have plastered similar sized areas myself.

Getting a smooth surface is a pain. I found it easier to finally smooth it off with a damp sponge than to try and do it with a trowel like the professionals.

Also I found the plaster sticks more easily to the wall if you mix in a packet of Pollyfilla with the plaster when you're mixing it up with the water.

Oh, great tips, thank you. Feeling a bit braver already!

You can do it. You need to wait though until the corner has thoroughly dried.
It looks as though it is in an inconspicuous area so won't matter if it is not perfect. Plastering does take practice but can be learned!
Get advice from a building supplier on which product to use, not from your local diy store.

Read up on how to do it on YT. Go for it OP ! ;)

Thanks, I may give it a go! I have time while I wait for it to dry to watch videos and read up. 🤓

There are some finishing plaster skims available for DIYers where you use a roller to apply the plaster and then use a smoothing tool and sand. Brands I've seen include Toupret, Polycell and Dalapro. I've not used them personally (yet!) but they have good reviews. Lots of videos of using them on Instagram.

Get the old plaster off and a dehumidifier in the room first - that wall needs to be dry as you can possibly get it before you set to with the plastering.

Yes, I was aiming for 6 weeks minimum... ideally after Xmas!

Update. I've removed a fair chunk of plaster that was easily crumbling away to the touch. I'm thinking plasterboard might be the way to go for the wall, and using plaster itself to smooth over the edges. The plaster was very thick on the brick, so plasterboard would at least get it to that same level. Any advice or thoughts welcome....

Is that brick an inner or outer wall? If it is an outer wall then there is no air circulation between it and the plaster and that is why the plaster will not adhere. It seems this entire wall needs insulation behind the plasterboard. It looks like a job for a professional ...

I think it was fine for many years before the flashing failed tbh. But yes, it's an outer wall.

Well in that case, it would cost a lot less to do it yourself and if you allow a bit of breathing space between the insulation and plasterboard it might just work for a few years. This is definitely one of those cases where you won't lose by trying and will increase your diy skills and self confidence!

Plasterboard will be a lot easier, first time I tried to patch with bonding plaster and skim it just turned into a mess due to varying suction (technical term) and general inexperience.
The second time I battened, insulated and plasterboarded and it was easy to tape and fill the plasterboard once it was up, then painting was a doddle on the new finish. Plasterboard is really cheap and it's basically just magic wall fixer, it's so flat and smooth.
The only downside is it's a bit harder to put up shelves.
Oh and you have to get it delivered (or spend half an hour cutting it up in Wickes car park...)

I've done it. To plaster directly onto the brick you need thistle hardwall plaster because it copes with high suction surfaces better and is both resilient and really easy to use, then once dry (a few hours at most) you skim with finishing plaster. The corner will be easier to do if you have a special (right angled) corner plastering tool.

Alternatively, use plasterboard attached using plasterboard adhesive foam (such as Soudal adhesive foam) (or with traditional battens but I understand that this is a lot of work and not particularly quick and easy). The adhesive foam is a newish product which is both waterproof and insulating. It's really easy to use and is increasingly used by professionals due to its' low cost and convenience. The plasterboard will also need a skim of finishing plaster once it's fitted.

There are several youtube videos demonstrating both hardwall plastering and using plasterboard with the Soudal (and other brands of) foam. I'm a total novice in plastering and have used both these techniques successfully at times, with youtube as a guide, to save money and get a great plastered finish.

Thanks, that sounds imminently doable!