Can the plasterer save my awful plaster boarding?

Joined
15 Dec 2008
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Hi All,

My house is a 1934 semi-detached. It hasn't had a lot done to it over the years.

I ripped down the existing ceiling which I should have photographed in advance. It was lined with wallpaper and had wooden trim which upon ripping out became clear that this was to conceal the board edges.

I intend to fit spotlights so fitting new boards allows me to dictate their placement.

I placed rock wool between the joists and replaced the boards with 12.5mm plasterboard.

Unfortunately the ceiling isn't square so it was tricky for a DIYer new to plaster-boarding to complete. I naively assumed it was square and took minimal measurements before cutting my boards.

Upon fitting it became clear that the walls ran out so I bought new boards and attempted to scribe.

The bigger problem is where the trimmer joist joins the trimming joist. The joists are connected together with a mortise and tenon joint but the underside of the joists are not flush.

This means that there is a lip of 3mm at one point and 6mm at another point.

I'm going to unscrew the boards to add shims to reduce the difference but I want to know how bad can it be before the plasterer can't make a decent job of it?

Photos:




The cable is for the smoke detector.

I was hoping to fill some of the gaps with expanding foam before I call the plasterer. Should I leave them and get him to fill them with bonding?

I've not finished screwing all the boards yet as I'm thinking to remove some of them in order to add shims.

Thanks
 
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