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Plasterboard for small bathroom ceiling

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  1. #1
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    Default Plasterboard for small bathroom ceiling

    I am replacing the ceiling in a small (4sqm) bathroom. The gyprock will be screwed to 450mm centres floor joists.

    Would 10mm aquachek be suitable? It will have one join along the recessed edge. Does it need to be back blocked?

    Thanks in advance

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    ...not sure what the standard requirement for bathroom ceilings are. Others here will likely know.

    In the past I've just used standard 10mm plaster on the ceilings.
    Backblocking - I've just used squares of plaster smeared with a thick layer of stud adhesive. Cant quite picture what you mean with the recessed edge but would suggest for the sake of 5min of effort you cant go wrong with applying the back blocking.

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    Quote Originally Posted by Bart1080 View Post

    In the past I've just used standard 10mm plaster on the ceilings.
    That is wrong, general use is 13mm or specialised 10mm plasterboard like Gyprock Supaceil.

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    Quote Originally Posted by phild01 View Post
    That is wrong, use 13mm or specialised 10mm plasterboard like Gyprock Supaceil.
    Are you sure? this quote is from Gyprock Redbook Page 2 https://www.gyprock.com.au/-/media/g...tion-guide.pdf

    "There are no requirements for treatment to ceilings of wetareas. Ceilings may be lined with Aquachek or with non-moisture resistant grades of Gyprock plasterboard."

    Edit: p.s. Having said that, I would probably go for Aquacheck or similar, especially as its such a small area

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    Quote Originally Posted by MeasureTwice View Post
    Are you sure? this quote is from Gyprock Redbook Page 2 https://www.gyprock.com.au/-/media/g...tion-guide.pdf

    "There are no requirements for treatment to ceilings of wetareas. Ceilings may be lined with Aquachek or with non-moisture resistant grades of Gyprock plasterboard."

    Edit: p.s. Having said that, I would probably go for Aquacheck or similar, especially as its such a small area
    Taking me out of context. Bart said he uses standard 10mm plasterboard for ceilings. I made no comment about using aquachek for ceilings. However if I did do that I would tighten up the joist spacings if 10mm is used. Note there is no requirement to use aquachek for ceilings.

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    Quote Originally Posted by phild01 View Post
    Taking me out of context. Bart said he uses standard 10mm plasterboard for ceilings. I made no comment about using aquachek for ceilings. However if I did do that I would tighten up the joist spacings. Note there is no requirement to use aquachek for ceilings.
    I thought you were suggesting that Bart was wrong to suggest that the OP could just use 10mm standard plasterboard and that the OP should use 13mm or a specialised board like 10mm Superceil. My interpretation of the Gyprock redbook is that are no special requirements for ceiling plasterboard in a wet area so why is 10mm standard not allowed?

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    Measuretwice, Bart generalised a statement he always uses standard 10mm plasterboard for ceilings which is wrong and that Gyprock brought out Superceil many years ago as an alternative to 13mm standard gyprock. It is stiffer and won't sag like 10mm standard. That's all I am saying.

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    Thanks for all the advice guys.

    Phild01, in my situation would you use 10mm supaceil, 10mm aquachek or 13mm aquchek?

    Would you backblock the join?

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    Quote Originally Posted by Bcnr33v View Post
    Thanks for all the advice guys.

    Phild01, in my situation would you use 10mm supaceil, 10mm aquachek or 13mm aquchek?

    Would you backblock the join?
    I always backblock any join though not necessary. For ceilings there is a requirement for large spans. You have just one join and while it may not be required it is great insurance against joint cracks appearing later. Anything can be used as a backblock and is best not hard fixed to any framing unless it is a noggin. I use board offcuts and cornice cement or basecoat.

    If your wet area is well ventilated then my preference is superceil. If a lot of steaming is anticipated then I would consider 13mm aquachek for 600mm ceiling joists.

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    Many thanks. Will use 13mm aquachek. Boards wont be heavy to lift anyway

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    Quote Originally Posted by phild01 View Post
    That is wrong, use 13mm or specialised 10mm plasterboard like Gyprock Supaceil.
    ...maybe your statement is wrong Phil!
    In any case, as its been some years so double checked the supply receipt. I didnt generalise, It was definitely 10mm Gyprock that was recommended and supplied by the CSR plastering supply company based on the plans supplied.

    The plaster was fixed to 450mm center's floor joists with cement sheeting for the 2 shower walls.
    Never had an issue with cracking or sagging in the 8/9 years its been there.

    For a 4sq bathroom wont be an issue with 10mm based on my experience with it.
    If you've got an exhaust fan placed in the right location near or above the shower, and you paint the plaster correctly moisture is a non issue.

    Thanks for the plaster redbook link MeasureTwice. A quick glance with the last update to the book in 2020, also seems to indicate on page 5, the recommended min product these days looks to be 10mm Supaceil although the standard 10mm "plus" says "primarily designed for residential walls"...so leaves an opening of interpretation. 13mm of the same range appears to be for commercial installations.

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    Quote Originally Posted by Bart1080 View Post
    ...maybe your statement is wrong Phil!
    In any case, as its been some years so double checked the supply receipt. I didnt generalise, It was definitely 10mm Gyprock that was recommended and supplied by the CSR plastering supply company based on the plans supplied.

    The plaster was fixed to 450mm center's floor joists with cement sheeting for the 2 shower walls.
    Never had an issue with cracking or sagging in the 8/9 years its been there.

    As I'd indicated, dont know what the standard is today but for a 4sq bathroom wont be an issue with 10mm based on my experience with it.
    If you've got an exhaust fan placed in the right location near or above the shower, and you paint the plaster correctly moisture is a non issue.
    I suggest you look at page 54 table 12 https://www.gyprock.com.au/-/media/g...8C84B4508084B7 and note the specs for types of gyprock. I mentioned that joist spacing comes into play; also you said
    In the past I've just used standard 10mm plaster on the ceilings.
    That is what I am saying is generally wrong. The inference being you build with it and as such would assume you are accustomed that 600mm is a common ceiling joist spacing not 450, but you are now qualifying what you say as a one off instance of 450mm spacing, that is not so common. We are not discussing aquachek, just standard gyprock.
    10mm Supaceil is commonly used and doesn't cost much more.

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    OK Phil, you may want to update your reference to the latest publication 2020 version, not 2018.
    OP had clearly stated he has 450mm centers and unless he is in a high wind category, then my advice based on what the OP provided is still sound as per the latest table 13, page 68 ...suggest you take a look!!
    ie: 10mm Gyprock Plus is perfectly suitable for his installation.

    ...Agree that anything extra such as 10mm Superceil is negligible in additional cost

    https://www.gyprock.com.au/-/media/g...tion-guide.pdf

    plaster.jpg

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    Bart, I am quoting you, not how it affects the OP.
    Your inference was standard 10mm plasterboard is suitable for ceilings as a generalisation and that is not so.
    In the past I've just used standard 10mm plaster on the ceilings.

    What you write suggests you do other ceilings in 10mm standard plasterboard when later you mention just for your one off situation. Anyone reading your statement could easily accept standard 10mm plasterboard is all they need for their situations and I wanted to pick up on that. 600mm ceiling joist spacings are regular and you need products like Supaceil or 13mm.


    13mm of the same range appears to be for commercial installations.
    13mm was the standard for homes built before the availability of specialised 10mm ceiling products.

    I edited my original post for better clarification.

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    A few years ago when I was doing my ceilings, CSR advised me that standard 10mm plasterboard was fine for ceilings or walls. Including bathrooms.

    Maybe they have changed the advice over the last 10 years? But they did not advise any need to use superceil or 13 mm at the time.

    My ceiling is fixed at 450mm centres (and glued too).

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    10mm standard board for 450 centers all ceilings except external ceilings.
    13mm or 10mm ceiling board for 600 centers.

    Back blocking is essential for all joints if using fiberglass tape, (including wall joints). Which I highly recommend you don't. I have banned it on all my jobs.
    Back blocking if using paper tape for ceilings with more than 2 joins.
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