Extra deep circular boxes?

[Donkmeister]

I'm installing interlinked Kidde smoke alarms in my house, and the instructions it suggests using round dry-lining boxes in the ceiling to fix the alarm base into.

The ceilings in my house are lath-and-plaster which has been overboarded at some time with plasterboard, the total depth is 25-30mm (depending on the artex pattern in each room!). The deepest circular box I've seen allows 20mm plasterboard thickness. Does anyone know of dry-lining boxes that allow a deeper material?

Plan B is to trim away the lathes where the mounting lugs will go so the box clamps just the plasterboard and not the L&P, but as I have 10 alarms to fit I'd rather be able to perform one operation with a hole saw if possible.

 

[SparkoJon]

Hi,

you can buy extra deep dry lining boxes:

http://www.qvsdirect.com/Round-Dry-...t&utm_medium=organic&utm_campaign=weekly-feed

 

[Donkmeister]

Thanks. Unfortunately those ones are limited to 17mm material thickness.

Looks like I'll be trimming a lot of laths!!!

 

[SgtTrojan]

Is there not enough meat on the ceiling to install the detectors surface mounted or are they a flush fitting type?

 

[Donkmeister]

Is there not enough meat on the ceiling to install the detectors surface mounted or are they a flush fitting type?

They could be surface mounted no problem as I could screw into a joist or install a noggin, but I thought I would stick to the manufacturer's instructions, even if it is a minor technicality that is unlikely to have any effect on the operation of the system!

 

[Taylortwocities]

If you use alarms like these AICO EI141
there is ample termination space inside the alarm base itself without having to use circ boxes.

 

[flameport]

Plan C:

Remove the lugs from the dry lining box
Use hole cutter to create a hole in the ceiling that the box just fits into - i.e. a tight fit
Glue the box in there with Gripfill or similar.

 

[Taylortwocities]

Plan D

Cut 50mm dia hole into ceiling void.
Terminate your cables into one of these

Fit smoke alarm over hole


Simples

Meerkat

• Taylortwocities
• 11 Dec 2009
• 53