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Old February 17th 17, 01:04 PM posted to uk.d-i-y
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Default Fixing deep back box for shower isolator

We live in a 1960s semi-detached dormer bungalow, the internal walls of
which seem to be made of something like an egg-box construction.

There's a 45A double pole switch for the shower mounted outside the
bathroom but whoever fitted it should have used a dry-lining box rather
than a metal back box. Presumably the reason they didn't, is that there
are no dry-lining boxes that have the lugs in the correct orientation
for this situation.

The metal back box that's there at the moment is a very deep one (don't
know if they're 45 or 50mm deep) but we can't get away with anything
shallower because of the two 10mm twin+earth cables and the depth of
the switch.

The problem is, the box is actually touching the plasterboard (or
whatever it is) at the other side of the wall, so there's no depth to
be able to plug and screw and fixings - which is why it needs a
dry-lining box that no one makes!

I've tried gluing the back box in but as soon as there is any movement
of the cables, which there obviously is when connecting the switch, the
glue can't hold and the box moves about again.

Any great ideas what to do? Photo he

https://btcloud.bt.com/web/app/share/invite/DP9yF4ef9r

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Old February 17th 17, 01:54 PM posted to uk.d-i-y
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Default Fixing deep back box for shower isolator

Pete Zahut wrote:
We live in a 1960s semi-detached dormer bungalow, the internal walls
of which seem to be made of something like an egg-box construction.

There's a 45A double pole switch for the shower mounted outside the
bathroom but whoever fitted it should have used a dry-lining box
rather than a metal back box. Presumably the reason they didn't, is
that there are no dry-lining boxes that have the lugs in the correct
orientation for this situation.

The metal back box that's there at the moment is a very deep one
(don't know if they're 45 or 50mm deep) but we can't get away with
anything shallower because of the two 10mm twin+earth cables and the
depth of the switch.

The problem is, the box is actually touching the plasterboard (or
whatever it is) at the other side of the wall, so there's no depth to
be able to plug and screw and fixings - which is why it needs a
dry-lining box that no one makes!

I've tried gluing the back box in but as soon as there is any movement
of the cables, which there obviously is when connecting the switch,
the glue can't hold and the box moves about again.

Any great ideas what to do? Photo he

https://btcloud.bt.com/web/app/share/invite/DP9yF4ef9r


Why not just use a surface mounted one?
You'll need some timber in the gap to affix it to, but it should hold up
better than a sunken box in that wall.


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Old February 17th 17, 02:14 PM posted to uk.d-i-y
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Default Fixing deep back box for shower isolator

On Friday, 17 February 2017 13:04:25 UTC, Pete Zahut wrote:
We live in a 1960s semi-detached dormer bungalow, the internal walls of
which seem to be made of something like an egg-box construction.



Scrape out some of the eggbox filling and insert a noggin between the plasterboard leaves. Then screw through the sides of the metal box into the noggin.

https://btcloud.bt.com/web/app/share/invite/DP9yF4ef9r


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Old February 17th 17, 02:17 PM posted to uk.d-i-y
Jim Jim is offline
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Default Fixing deep back box for shower isolator

Pete Zahut Wrote in message:
We live in a 1960s semi-detached dormer bungalow, the internal walls of
which seem to be made of something like an egg-box construction.

There's a 45A double pole switch for the shower mounted outside the
bathroom but whoever fitted it should have used a dry-lining box rather
than a metal back box. Presumably the reason they didn't, is that there
are no dry-lining boxes that have the lugs in the correct orientation
for this situation.

The metal back box that's there at the moment is a very deep one (don't
know if they're 45 or 50mm deep) but we can't get away with anything
shallower because of the two 10mm twin+earth cables and the depth of
the switch.

The problem is, the box is actually touching the plasterboard (or
whatever it is) at the other side of the wall, so there's no depth to
be able to plug and screw and fixings - which is why it needs a
dry-lining box that no one makes!


One of these?

http://www.websparky.co.uk/acatalog/...mm-Deep-Dry-Li
ning-Box-WA107P.html

Can you inject some gripfill /Stixall type adhesive through the
holes in the back if the one you've got already & try
again?
--
Jim K


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Old February 17th 17, 03:06 PM posted to uk.d-i-y
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Default Fixing deep back box for shower isolator

jim expressed precisely :
Pete Zahut Wrote in message:
We live in a 1960s semi-detached dormer bungalow, the internal walls of
which seem to be made of something like an egg-box construction.

There's a 45A double pole switch for the shower mounted outside the
bathroom but whoever fitted it should have used a dry-lining box rather
than a metal back box. Presumably the reason they didn't, is that there
are no dry-lining boxes that have the lugs in the correct orientation
for this situation.

The metal back box that's there at the moment is a very deep one (don't
know if they're 45 or 50mm deep) but we can't get away with anything
shallower because of the two 10mm twin+earth cables and the depth of
the switch.

The problem is, the box is actually touching the plasterboard (or
whatever it is) at the other side of the wall, so there's no depth to
be able to plug and screw and fixings - which is why it needs a
dry-lining box that no one makes!


One of these?


http://www.websparky.co.uk/acatalog/...mm-Deep-Dry-Li
ning-Box-WA107P.html


That's a standard dry-lining box. I need the lugs to be on the other
two surfaces (top and bottom as you look at that photo) but nobody
makes them.

Can you inject some gripfill /Stixall type adhesive through the
holes in the back if the one you've got already & try
again?


Maybe, but not hopeful to be honest.


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Old February 17th 17, 03:09 PM posted to uk.d-i-y
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Default Fixing deep back box for shower isolator

Phil L used his keyboard to write :
Pete Zahut wrote:
We live in a 1960s semi-detached dormer bungalow, the internal walls
of which seem to be made of something like an egg-box construction.

There's a 45A double pole switch for the shower mounted outside the
bathroom but whoever fitted it should have used a dry-lining box
rather than a metal back box. Presumably the reason they didn't, is
that there are no dry-lining boxes that have the lugs in the correct
orientation for this situation.

The metal back box that's there at the moment is a very deep one
(don't know if they're 45 or 50mm deep) but we can't get away with
anything shallower because of the two 10mm twin+earth cables and the
depth of the switch.

The problem is, the box is actually touching the plasterboard (or
whatever it is) at the other side of the wall, so there's no depth to
be able to plug and screw and fixings - which is why it needs a
dry-lining box that no one makes!

I've tried gluing the back box in but as soon as there is any movement
of the cables, which there obviously is when connecting the switch,
the glue can't hold and the box moves about again.

Any great ideas what to do? Photo he

https://btcloud.bt.com/web/app/share/invite/DP9yF4ef9r


Why not just use a surface mounted one?
You'll need some timber in the gap to affix it to, but it should hold up
better than a sunken box in that wall.


Maybe - as a last option. Wifey doesn't want it sticking out of the
wall but it may have to stick out a bit if we can't do anything else,
thanks though.
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Old February 17th 17, 03:13 PM posted to uk.d-i-y
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Default Fixing deep back box for shower isolator

Pete Zahut wrote:
jim expressed precisely :
Pete Zahut Wrote in message:
We live in a 1960s semi-detached dormer bungalow, the internal walls of
which seem to be made of something like an egg-box construction.

There's a 45A double pole switch for the shower mounted outside the
bathroom but whoever fitted it should have used a dry-lining box rather
than a metal back box. Presumably the reason they didn't, is that there
are no dry-lining boxes that have the lugs in the correct orientation
for this situation.

The metal back box that's there at the moment is a very deep one (don't
know if they're 45 or 50mm deep) but we can't get away with anything
shallower because of the two 10mm twin+earth cables and the depth of
the switch.

The problem is, the box is actually touching the plasterboard (or
whatever it is) at the other side of the wall, so there's no depth to
be able to plug and screw and fixings - which is why it needs a
dry-lining box that no one makes!


One of these?


http://www.websparky.co.uk/acatalog/...mm-Deep-Dry-Li
ning-Box-WA107P.html


That's a standard dry-lining box. I need the lugs to be on the other
two surfaces (top and bottom as you look at that photo) but nobody
makes them.

Can you inject some gripfill /Stixall type adhesive through the
holes in the back if the one you've got already & try
again?


Maybe, but not hopeful to be honest.


Um, your switch has screws top and bottom so you want a box that has screw
fixings in the same place. Fit that dry lining box vertically and you have
what you need, unless I'm missing something obvious...

Tim

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Old February 17th 17, 03:41 PM posted to uk.d-i-y
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Posts: 31,393
Default Fixing deep back box for shower isolator

In article ,
Phil L wrote:
I've tried gluing the back box in but as soon as there is any movement
of the cables, which there obviously is when connecting the switch,
the glue can't hold and the box moves about again.


Remove the box, and fit a couple of wood battens either side of the
opening (1" x 1" will be more than adequate) to the back of the
plasterboard, their edges flush with the opening. Screw them in place
using screws through the plasterboard and make good the heads - non
rusting screws being best.

Then screw the box to the battens using small countersunk head screws that
won't foul on the fitting in any way. You may well have to drill holes in
the box sides for this.

This method provides an extremely strong fixing for any steel backbox
into plasterboard.

If the plasterboard were tiled or well decorated, you might get away with
glueing the battens to the back of it and clamping until the glue sets. If
you're lucky. ;-)

--
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Dave Plowman London SW
To e-mail, change noise into sound.
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Old February 17th 17, 03:49 PM posted to uk.d-i-y
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Default Fixing deep back box for shower isolator

Tim+ submitted this idea :
Pete Zahut wrote:
jim expressed precisely :
Pete Zahut Wrote in message:
We live in a 1960s semi-detached dormer bungalow, the internal walls of
which seem to be made of something like an egg-box construction.

There's a 45A double pole switch for the shower mounted outside the
bathroom but whoever fitted it should have used a dry-lining box rather
than a metal back box. Presumably the reason they didn't, is that there
are no dry-lining boxes that have the lugs in the correct orientation
for this situation.

The metal back box that's there at the moment is a very deep one (don't
know if they're 45 or 50mm deep) but we can't get away with anything
shallower because of the two 10mm twin+earth cables and the depth of
the switch.

The problem is, the box is actually touching the plasterboard (or
whatever it is) at the other side of the wall, so there's no depth to
be able to plug and screw and fixings - which is why it needs a
dry-lining box that no one makes!


One of these?


http://www.websparky.co.uk/acatalog/...mm-Deep-Dry-Li
ning-Box-WA107P.html


That's a standard dry-lining box. I need the lugs to be on the other
two surfaces (top and bottom as you look at that photo) but nobody
makes them.

Can you inject some gripfill /Stixall type adhesive through the
holes in the back if the one you've got already & try
again?


Maybe, but not hopeful to be honest.


Um, your switch has screws top and bottom so you want a box that has screw
fixings in the same place. Fit that dry lining box vertically and you have
what you need, unless I'm missing something obvious...

Tim


Only two 10mm twin and earth cables coming in and going out at the
bottom :')


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