1st Fix (Blockwork)

[rednaxela]

When fitting cables for sockets and lighting, can they be run along the surface of blockwork and then plastered over, or do you need to create channels?
I am unsure how deep a plastered finish is, as this will also determine how deep the mounting boxes will need to be for the sockets and switches.

Any information would be great.

Thanks, Alex. (planning his extension)

 

[RMS]

plastered finishes can vary depending on the plasterer. I would consult the plasterer for this information.

 

[fireman22]

shallow metal back boxes for light switches can go straight on to block deeper boxes for socket set in about half was so amount protruding is same as shallow box, most plasterers i know like you just to clip cable to wall easier for them to plaster

 

[RF Lighting]

If it is a new build then chances are the plasterer will dot and dab plasterboard onto the walls. This is usually sufficient to cover capping with out any flushing in required, but a 20mm (or above) conduit will require some channeling in.

But as has been said check with the plasterer

 

[bondy]

if you do chase in, dont forget there is a max chase depth. its less for horizontal chases than it is for vertical ones. i must admit, we chase in even when we dot and dab. less dot and dab gear and the finished walls are straighter afterwards.

 

[rednaxela]

Thanks for the information guys.
I take it Dot and Dab replaces the requirement for the initial plaster material before the top coat?
Is this becoming popular due to cost, or is it better/faster than traditional methods?
(I guess this is moving out of the Forum, but I would be interested to know)

Many thanks again for your comments.
Alex.

 

[martybli]

Dot and Dab is where the plasterer puts small dabs of a type of bonding plaster (not the typical bonding plaster) and then places plasterboard on top. Usually this is done with tapered edge boards and all the plasterer does is then fill in the joints with a joint finishing plaster.

This is done due to speed off application and little drying time. Look up Drylining on the net for more info.