Replacing a ceiling

[GMM]

Following a flat roof leak, I have a soggy ceiling with a big split in it. Now that the roof is being fixed, I'm going to have a bash at the ceiling myself: It's only about 2 metres each way, so what could possibly go wrong? (!)

I'm going to tear it down tomorrow and leave it for a week for everything to dry properly. In replacing, I want to take the opportunity to put some insulation in there. Now, I understand that it's best to use foil-backed plasterboard to control vapour but I can't find plasterboard with both a foil back and a tapered edge.

So...What's the best thing to do? Use foil backed square edge, which will either need skimming or a bit of luck to get a good finish, or use tapered edge and stick some foil on the back? The latter sounds attractive but I might be missing something - like what's the best way of sticking foil to plasterboard?

Any suggestions welcome!

[ARWadsworth]

I have no comment to make about the plasterboard, however if you have any electric cables in the roof space then have a look at

make sure the insulaton will not affect their performance.

Cheers

[Tabby]

I think any of the above sound doable. PVA glues both ali and paper. I have also used square edge and only filled it before, and got a satisfactory result, the main downside is that you cant then use reinforcing mesh tape across the gap, so cracks are more likely to occur. Such cracks are easily fixed with a finger and a little filler.

Polythene is an inferior sub for ali foil. It doesnt last well, and although its waterproof it isnt vapour proof, just vapour resistant to a fair extent.

With a dead man and small 9mm boards you should have little problem.

NT

[Bartc]

The traditional method is under some concrete in the basement.

[The Natural Philosopher]

Is that why the milk leaks out of all my polythene bottles then?

[Tabby]

If you can fill ok, you should be fine.

[Tabby]

its not hard to cut boards to fit before offering them up. Just measure the space properly, pencil it on the board and cut with a knife. That always needs doing.

eithe use a ruler, or mark the straight edge with a bit of timber & cut freehand

look where youre going, dont get careless. Damage can be filled anyway.

Doesnt matter, filler covers all.

its not hard.

NT

[Gill Smith]

why use foil to 'control' (condense?) vapour?

kitchens are all about ventilation

surely you'll be creating a damp problem

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[geraldthehamster]

into a colder space, and condensing there. Ventilation from the kitchen should be to the outside, by means of windows or an extractor, not into a cold roof space, where it will promote rot.

That's why ;-)

Cheers Richard

[Gill Smith]

thanks for the info

I too have a kitchen ceiling to repair

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[geraldthehamster]

above it (as opposed to another floor of your house).

Cheers Richard