Overcoming joists

[Lazlo]

Cut 100mm access holes to ceiling with hole saw to either sides of joists, mark the discs you have against the holes so you can get them back in alignment (plaster is not as even as it looks), look at joists and feel them to make sure there are no cables clipped to it or pipes, then get your long spade bit and drill through joist from access hole, feed cable though, get timber batten about 300mm long, place up into 100mm holes, screw through plasterboard ceiling into batten from either side of the circular hole, then hold disc up against batten and screw into batten bridge across hole. Get your easy fill 45 out and get filling.......

 

[telectrix]

100mm holes??????? do you drive a bus or an artic?

 

[Lazlo]

They are big enough to get the correct angle on the long spade bit any smaller and you risk drilling diagonally through joist putting your cables too close to the floor above (nails etc), plus you risk the plastered plasterboard discs disintegrating if they are any smaller.

You can try smaller holes but you will probably regret it.

I drive a van FYI.....

 

[telectrix]

i see your method and can't fault it. but i go for smaller holed, don't drill joist but go under it with a steel protector under the cable. however, every job is different and methods vary accordingly.

 

[Dave OCD]

You could just drill 1 x 100mm or even 75mm hole directly under the joist then cut a small notch for the cable across the underside then screw the plasterboard circle back either side of the notch and fill round the edge.

 

[uksparks]

Just clip it to the underside of the joist where you have bashed a hole in the ceiling, I do it all the time.

 

[DPG]

Just clip it to the underside of the joist where you have bashed a hole in the ceiling, I do it all the time.

I think I'd have put a smiley after that to show that you were joking. Daz

 

[uksparks]

Lol. I generally cut as small a hole I can get away with either side of the joist to get the cable through, clip it tithe underside. I'll be quite honest I don't put anything over the cable, it's RCD protected and in the ceiling, I don't think putting a bit of steel over it is going to make s great deal of difference, I'm not saying I don't do that, it just depends, each job is slightly different.

 

[Simonslimline]

You could just drill 1 x 100mm or even 75mm hole directly under the joist then cut a small notch for the cable across the underside then screw the plasterboard circle back either side of the notch and fill round the edge.

Pretty much how we do it when needed. Locate joist with a braddle and poke a hole through either side, use multitool and cut a small square out slightly longer than the joist on either side and notch the joist to one side of the square, pull cable through and screw board back and fill.


Edit, refereeing to Davesparks comment regarding Part A, i will certainly be questioning the method described above next time the situation arrises at work.

 

[tomspark93]

From their description on your link: 'A plastic box to insulate connector blocks'

I would say most people would see your phrase 'chock block' in your earlier post and assume you meant screw terminals though. Daz

Your both mistaken, choc block is actually loosely tightend connector strip that creates a high resistant joint which then melts like chocolate:juggle2: