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PostPosted: Fri Jul 14, 2017 12:37 pm 
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I am planning a small shower room / toilet in a corner of a bedroom.
Need to build two walls, about 1.8 meters long each. Timber frame, I think. One will house a door.
Floor is a solid concrete. Existing walls are brick.

How do I join the timber frame to the existing plasterboard ceiling?

Also, how can I make the ordinary plasterboard ceiling suitable for shower room?
Any sort of DPM to be painted over? or do I HAVE to take it down and fix a proper bathroom type plasterboard?


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PostPosted: Fri Jul 14, 2017 1:28 pm 
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One of the new walls will span the joists, these are an obvious fixing point.

The other new wall is likely to be between two joists - either fit noggins where required or use Redidrivas and some Gripfill on the top plate and ensure that the corners of that top plate are well fixed to the other new stud wall (the one spanning the joists) and at the opposite end against the brickwork.

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PostPosted: Fri Jul 14, 2017 3:27 pm 
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:withstupid:

I agree with ayjay. Initially you may want to set out the new stud walls on the floor, then transfer them to the ceiling using a level and straight edge or plumb-bob. This would then enable you to establish the fixing points for the head in the existing joists or new noggins.

A good bathroom type quality paint would do on walls or ceiling. Although it would be prudent t tile walls effected by the chower. Ywoud also need to provide an extraction fan to provide air changes as specified by building regulations.

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PostPosted: Fri Jul 14, 2017 5:51 pm 
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so this means that I need to remove the ceiling plasterboard - at least a part of it where the new walls will be - and fix the top plates of the new wall to the joists in the ceiling and perhaps create additional joist for the wall which will go parallel to the joists?


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PostPosted: Fri Jul 14, 2017 6:10 pm 
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michaelp wrote:
so this means that I need to remove the ceiling plasterboard - at least a part of it where the new walls will be - and fix the top plates of the new wall to the joists in the ceiling and perhaps create additional joist for the wall which will go parallel to the joists?


No. You can screw straight through the p/b with a 4" screw. Mark the position of the top plate and have a poke around between the marks to find the joists - you can use a thin screwdriver or a bradawl or a hammer and nail, any holes you make will be covered by the top plate.

It's not essential to have a joist for the other wall, a couple of noggins is best if you have access to the floor above, (it can be done from below but probably not without showing afterwards) - the other method I suggested is perfectly good enough for a short stud wall.

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PostPosted: Fri Jul 14, 2017 7:17 pm 
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Gripfill on the top plates and dovetail some screws or nails in and it'll be fine,trust me.
I set a top plate in the wrong position last week that was held up with gripfill and removing it was a nightmare the next day,had to patch the ceiling as it pulled the boarding away when removing.

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