Cutting Back Plasterboard

Katelina · Post by **Katelina** » Thu Sep 30, 2021 12:44 pm

I have recently installed new doorways into wall that has a drylined plasterboard covering on one side.

The plasterboard is not quite straight and so it is slightly proud of the frame in places.

I want to install architraves around the doors and I am wondering what options I have for reducing the thickness.

Any ideas would be most appreciated.

dewaltdisney · Post by **dewaltdisney** » Thu Sep 30, 2021 12:58 pm

What would normally happen is that the board high spots would be hammered level as the architrave covers the crushed edge. The logic is that any damage to the paper face reduces the strength of the board in that area, however, the sandwich effect of fitting the architrave tends to make up for it. Much will depend on how proud the board is and how extensive it is in this case.

DWD

Katelina · Post by **Katelina** » Thu Sep 30, 2021 7:37 pm

Unfortunately, the plasterboard is up to 5mm proud, and so it needs to be cut back.
The architrave just won't sit level.
I am thinking of using an angle grinder flat side on with the guard removed.
Any other ideas would be most welcome.

Rorschach · Post by **Rorschach** » Thu Sep 30, 2021 7:45 pm

Id probably look at adding 5mm to the frame myself.

dewaltdisney · Post by **dewaltdisney** » Thu Sep 30, 2021 7:52 pm

Funnily enough, I mentioned a Surform in a thread recently. These are like a plane but the blade is like a cheese grater you can get a small one for a fiver at Toolstation. I used one on a plasterboard edge to make it fit in an awkward spot and it worked a treat. That should do the job but cover up well as it will kick out a load of dust and don't go mad with it. Here is a link https://www.toolstation.com/stanley-sur ... tr=surform

DWD

ayjay · Post by **ayjay** » Thu Sep 30, 2021 9:08 pm

I use an electric plane to rebate the back of the architrave until it fits - leave it full thickness where it fixes to the frame obviously.

big-all · Post by **big-all** » Thu Sep 30, 2021 11:02 pm

the easiest way will depend on what woodworking tools you have and weather they are set up to full health and safety or "norm says this is how you do it " levels

as in table saw flat against the fence one pass up right and one flat or break the 2mm by plying the the off cut to and forth :dunno:

Katelina · Post by **Katelina** » Fri Oct 01, 2021 7:10 am

dewaltdisney wrote: ↑Thu Sep 30, 2021 7:52 pm Funnily enough, I mentioned a Surform in a thread recently. These are like a plane but the blade is like a cheese grater you can get a small one for a fiver at Toolstation. I used one on a plasterboard edge to make it fit in an awkward spot and it worked a treat. That should do the job but cover up well as it will kick out a load of dust and don't go mad with it.

Yup, I know this tool. I shall try to find one here in Portugal.
Thank you DWD!

Katelina · Post by **Katelina** » Fri Oct 01, 2021 1:37 pm

It appears that they are available here, so I just need to track one down.