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Fixing acrylic bath - enclosed 3 sides (1 masonry, 2 stud)

Discussion in 'Plumbing and Central Heating' started by Dain1, 10 Jan 2021.

  1. Dain1

    Dain1

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    The 4 supplied fixing brackets are quite minimal; fixed to the wall, with silicon bonding bath to bracket.

    There are 3 strengthening blocks moulded in to the underside of the rim (plus 1 in each corner) connecting the downstanding rim to the top of the bath sides. Are they just for strengthening, or fixing a support frame to? There is no tubular cradle supplied, just 2 light galvanised channels with feet on threaded bar, to fix underneath.

    Is the pair of channels on feet now considered largey sufficient to support the bath, with no runners or batten frame required under the rims of each long side?
     

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    Last edited: 10 Jan 2021
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  3. lostinthelight

    lostinthelight

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    Depends on the quallity of bath but if channels came with it and you follow directions it should be ok. My bath has channel , fully encapsulated baseboard and brackets but I still CT1 bonded it to battons fixed to the walls
    D665CCBC-D95A-4873-AF06-AA8081AFA902.jpeg
     
  4. Madrab

    Madrab

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    To make the bath as sturdy as possible and to ensure the edge seals properly and lasts, you want to support it along any full lengths of the edges of the bath that touches a wall and ideally a frame at the front/open ends or at least the corners.

    I always use batons on the wall and add batons to the inside edges of the bath if it doesn't have them.
     
  5. lostinthelight

    lostinthelight

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    Something like:
    IMG_20191215_110030661.jpg
     
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  6. Madrab

    Madrab

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    That'll do nicely, it means that no matter where weight is put on it it (say getting in and out the bath) isn't going to flex and break things like the seal against the wall. Not so important on a metal bath of course as they don't tend to flex as much as acrylic do.
     
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  7. Dain1

    Dain1

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    Thank you,
    Is that full length rail up under the rim supporting the rim underside continuously? Or supporting moulded in blocks like mine has?

    Is that treated roofing batten?

    I always wonder what size bat was originally used when ripping old stuff out; it never seems to tally even with imperial known sizes, like it shrinks significantly as it dries over the years. Travis stores it outside so I dry it out in the house before using.
     

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    Last edited: 12 Jan 2021
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  9. Dain1

    Dain1

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    Thenk you, CT1 sounds useful.

    The bath will have a new stud wall at each end (to be enclosed on 3 sides), what sort of a gap should I leave at ends to take the CT1 (baths going in corners look easier, you just sealant 2 sides and push it in). I suppose it wouldn't take much to rig a reducer for the sealant nozzle if I had to.
     
  10. Madrab

    Madrab

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    Just use CLS, the trick is once it's all in and sealed properly then no water should get to it, so it doesn't need to be treated.

    I must admit I find CT1/wetgrabs etc and the similar silicone adhesives are a bit overkill for a job like mounting an acrylic bath. I find the sealant needs a bit of flex with acrylic baths for the weight on and off and use movement, I find the adhesives a bit firm and don't allow as much give.
    I just use a good quality silicone.
     
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  11. Dain1

    Dain1

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    Also, there's a glass shower screen going on, so a batten top rail that loses 3mm width over the next 18 months might not be too clever.

    Basic silicons have come on quite a bit over the years, what brand do you use?

    And, slightly related, what thickness tile backer would you put on a new stud, that will have 8mm pvc panels going on. How rigid does the stud it need to be, I was thinking 6mm backer might be a bit thin?
     
    Last edited: 12 Jan 2021
  12. Madrab

    Madrab

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    I use Dow Corning, I'm sure others have their own preference.

    6mm Backer board should be fine, it's not plasterboard remember, it's a cementous board and a lot tougher, just space the batons accordingly.

    8mm PVC panels, are they board backed or honeycomb? If it's the latter then be careful as one good dunt on the board and it deforms. I've seen the honeycomb board that's had someone slip and their elbow hit it and it left a lovely elbow shaped depression.
     
  13. mikeey84

    mikeey84

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    Does the rim of the bath sit on the batton, or do they sit under the rim?
     
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