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PostPosted: Tue Jul 11, 2017 9:37 pm 
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I have a question regarding fixing up holes in plasterboard.

The plasterboard ceiling is attached to ceiling joists - I need to add insulation to the space between these joists in order to stop the bathroom floor from getting cold during the autumn and winter.


Using a plasterboard saw, I am considering cutting rectangular shape holes 30cm wide x 18cm tall on the ceiling between each of the joists (locations of joists are marked on the wall in yellow chalk).

30cm wide should cover almost all of the space between each joist and should allow me to add some nice Knauf Glass Mineral wool insulation making contact with the underside of the bathroom floor to stop the tiles getting really cold during autumn and winter months (sometimes summer months too when the humidity is low).

When I cut into the plasterboard I will keep the pieces that I have cut out - once I add the insulation between the joists I will mount the cut out piece of plasterboard back into each hole and screw them in using plasterboard screws.

I need to cover up the hole and ensure it blends into the rest of the ceiling so it is not noticeable that work was done.

Dilemma

What type of plaster do I need to use to match the rest of the ceiling? When I watch YouTube videos of people doing drywall patch repairs I see them adding plaster that is not light grey like it is on my ceiling.

I need to do this right so that it isn't visible that work was done. I.e. that the colour of the plaster I put on to repair the hole is the same as the colour of the existing plaster.

I'm new to this sort of thing but like most DIY stuff, I am a fast learner and always get the job done in the end.

But I cannot embark on this one unless I know I can make the patching at the end blend right into the rest of the ceiling.

I have attached photo of ceiling and photo of a hole that a plumber had to cut in the ceiling to fix a leak one time - this to help identify the type of plasterboard that is fixed to the joists.

Please advise :)


Attachments:
File comment: Sample hole
_DSC0146.jpg
_DSC0146.jpg [ 65.92 KiB | Viewed 547 times ]
File comment: Ceiling
_DSC0144.jpg
_DSC0144.jpg [ 81.49 KiB | Viewed 547 times ]
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PostPosted: Tue Jul 11, 2017 10:42 pm 
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I wonder if you have considered installing "Electric under flooring heating in your bathroom?
Having recently installed such a system in our Wet-room I am delighted with the result.
We have found that 'foot comfort' is achieved after only 20minutes and tend to turn the heating off
then and on again later in the day when required.
Link for your information:-
http://www.theunderfloorheatingstore.co ... s?___SID=U

davyp1


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PostPosted: Tue Jul 11, 2017 10:48 pm 
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davyp1 wrote:
I wonder if you have considered installing "Electric under flooring heating in your bathroom?
Having recently installed such a system in our Wet-room I am delighted with the result.
We have found that 'foot comfort' is achieved after only 20minutes and tend to turn the heating off
then and on again later in the day when required.
Link for your information:-
http://www.theunderfloorheatingstore.com/electric-underfloor-heating/underfloor-heating-loose-cables?___SID=U

davyp1


Thanks davyp1 for the suggestion. But I think the insulation for now will do.


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PostPosted: Tue Jul 11, 2017 10:48 pm 
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davyp1 wrote:
I wonder if you have considered installing "Electric under flooring heating in your bathroom?
Having recently installed such a system in our Wet-room I am delighted with the result.
We have found that 'foot comfort' is achieved after only 20minutes and tend to turn the heating off
then and on again later in the day when required.
Link for your information:-
http://www.theunderfloorheatingstore.com/electric-underfloor-heating/underfloor-heating-loose-cables?___SID=U

davyp1




Are you able to help with my plastering dilemma?


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PostPosted: Tue Jul 11, 2017 11:00 pm 
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To reply to your initial question:-

I will describe the repair to one single hole, but the same will apply to all!

First cut a piece of plasterboard which measures approx 40mm larger that the hole on all sides.
Check to make sure the piece of board can be passed diagonally through the hole to rest on the existing ceiling.
Make some pencil marks on the board so you can centralise it later.
Remove the board and drill four 3mm holes in four corners of the board, but in places so as not to be covered by the ceiling.
Pass 4 lengths of cord through the holes and knot at the back.
Replace the board back in the ceiling.
Taking hold tightly of one of the cords, pull down tightly while screwing a dry-walll screw through the cieling and board.
Repeat for the other cords and then every 100mm or so round the patch.
Then cut off the cords flush with the board.
If you have the piece of plaster-board that was cut from the ceiling into the hole and fix again with dry-wall screws.
The screws may be countersunk lightly into the board.
All remaining cosmetic repair should be achieved with fine surface filler and fine sand-paper.

davyp1



For this message the author davyp1 has received gratitude : multiman
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PostPosted: Tue Jul 11, 2017 11:13 pm 
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davyp1 wrote:
To reply to your initial question:-

I will describe the repair to one single hole, but the same will apply to all!

First cut a piece of plasterboard which measures approx 40mm larger that the hole on all sides.
Check to make sure the piece of board can be passed diagonally through the hole to rest on the existing ceiling.
Make some pencil marks on the board so you can centralise it later.
Remove the board and drill four 3mm holes in four corners of the board, but in places so as not to be covered by the ceiling.
Pass 4 lengths of cord through the holes and knot at the back.
Replace the board back in the ceiling.
Taking hold tightly of one of the cords, pull down tightly while screwing a dry-walll screw through the cieling and board.
Repeat for the other cords and then every 100mm or so round the patch.
Then cut off the cords flush with the board.
If you have the piece of plaster-board that was cut from the ceiling into the hole and fix again with dry-wall screws.
The screws may be countersunk lightly into the board.
All remaining cosmetic repair should be achieved with fine surface filler and fine sand-paper.

davyp1



Fantastic.

Will it blend with the rest of the ceiling well?


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PostPosted: Tue Jul 11, 2017 11:31 pm 
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With careful filling it should blend in well as you are replacing the original plastered ceiling!
The only odd-ball is the plumbers hole. at will need to be patched with new board then skimmed with thistle board finish.
Apply the thistle in two thin coats and trowel till polished.

davyp1



For this message the author davyp1 has received gratitude : flembot
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PostPosted: Wed Jul 12, 2017 12:03 am 
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davyp1 wrote:
With careful filling it should blend in well as you are replacing the original plastered ceiling!
The only odd-ball is the plumbers hole. at will need to be patched with new board then skimmed with thistle board finish.
Apply the thistle in two thin coats and trowel till polished.

davyp1



Thanks so much. I'm looking forward to completing the project. Do you recommend a particular filling product?


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PostPosted: Wed Jul 12, 2017 8:24 am 
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flembot wrote:
davyp1 wrote:
With careful filling it should blend in well as you are replacing the original plastered ceiling!
The only odd-ball is the plumbers hole. at will need to be patched with new board then skimmed with thistle board finish.
Apply the thistle in two thin coats and trowel till polished.

davyp1



Thanks so much. I'm looking forward to completing the project. Do you recommend a particular filling product?


You should be fine with any of the pre-mixed 'Fine Surface' fillers.
The key to good filling though is a good wide bladed 'Filling' knife (looks like a scraper - but with a very thin blade towards the end)
https://www.google.co.uk/search?q=filli ... =638&dpr=1

davyp1



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PostPosted: Wed Jul 12, 2017 5:27 pm 
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davyp1 wrote:
flembot wrote:
davyp1 wrote:
With careful filling it should blend in well as you are replacing the original plastered ceiling!
The only odd-ball is the plumbers hole. at will need to be patched with new board then skimmed with thistle board finish.
Apply the thistle in two thin coats and trowel till polished.

davyp1



Thanks so much. I'm looking forward to completing the project. Do you recommend a particular filling product?


You should be fine with any of the pre-mixed 'Fine Surface' fillers.
The key to good filling though is a good wide bladed 'Filling' knife (looks like a scraper - but with a very thin blade towards the end)
https://www.google.co.uk/search?q=filli ... =638&dpr=1

davyp1



Six inch blade wide enough?


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PostPosted: Wed Jul 12, 2017 5:41 pm 
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flembot wrote:
davyp1 wrote:
flembot wrote:
davyp1 wrote:
With careful filling it should blend in well as you are replacing the original plastered ceiling!
The only odd-ball is the plumbers hole. at will need to be patched with new board then skimmed with thistle board finish.
Apply the thistle in two thin coats and trowel till polished.

davyp1



Thanks so much. I'm looking forward to completing the project. Do you recommend a particular filling product?


You should be fine with any of the pre-mixed 'Fine Surface' fillers.
The key to good filling though is a good wide bladed 'Filling' knife (looks like a scraper - but with a very thin blade towards the end)
https://www.google.co.uk/search?q=filli ... =638&dpr=1

davyp1



Six inch blade wide enough?


That's the same as mine :huray:


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PostPosted: Sun Jul 16, 2017 11:35 pm 
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davyp1 wrote:
flembot wrote:
davyp1 wrote:
flembot wrote:
davyp1 wrote:
With careful filling it should blend in well as you are replacing the original plastered ceiling!
The only odd-ball is the plumbers hole. at will need to be patched with new board then skimmed with thistle board finish.
Apply the thistle in two thin coats and trowel till polished.

davyp1



Thanks so much. I'm looking forward to completing the project. Do you recommend a particular filling product?


You should be fine with any of the pre-mixed 'Fine Surface' fillers.
The key to good filling though is a good wide bladed 'Filling' knife (looks like a scraper - but with a very thin blade towards the end)
https://www.google.co.uk/search?q=filli ... =638&dpr=1

davyp1



Six inch blade wide enough?


That's the same as mine :huray:



Nice!

Was just thinking - should I fit reflective foil bubble insulation instead?

It might be a bit trickier but might be worth it?


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PostPosted: Mon Jul 17, 2017 1:48 am 
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flembot wrote:
davyp1 wrote:
flembot wrote:
davyp1 wrote:
flembot wrote:
davyp1 wrote:
With careful filling it should blend in well as you are replacing the original plastered ceiling!
The only odd-ball is the plumbers hole. at will need to be patched with new board then skimmed with thistle board finish.
Apply the thistle in two thin coats and trowel till polished.

davyp1



Thanks so much. I'm looking forward to completing the project. Do you recommend a particular filling product?


You should be fine with any of the pre-mixed 'Fine Surface' fillers.
The key to good filling though is a good wide bladed 'Filling' knife (looks like a scraper - but with a very thin blade towards the end)
https://www.google.co.uk/search?q=filli ... =638&dpr=1

davyp1



Six inch blade wide enough?


That's the same as mine :huray:



Nice!

Was just thinking - should I fit reflective foil bubble insulation instead?

It might be a bit trickier but might be worth it?


Would I be able use celotex without removing plasterboard fixed to the joists?


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PostPosted: Mon Jul 17, 2017 8:02 am 
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There is a product where Celotex of most thicknesses is bonded to sheets of Plasterboard of standard sizes.
Your existing ceiling could be overboarded with this product but would require a total re-skimming of the entire ceiling.
Unless your skills include the plastering of a ceiling, I would sugest you employed a plasterer for this work.

davyp1



For this message the author davyp1 has received gratitude : flembot
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