New build timber framed problem

[jstephens251]

Hi everyone,

Thought I'd post here to see if any of you have wired new builds single storey, no loft with foil back insulation.

Its a high spec new build - downlights, data cables, speakers wires etc

I have attached a pic of the ceiling which has just been finished.

The problems i've got is there is barely a 40mm gap so drilling through will put me way out of regs. This stuff is stapled tight to ceiling so bit of a nightmare really.

Wondered what others have done to comply with regs.

Cheers, Jon

 

[Lee42]

As long as a screw can't penetrate the plate I can't see a problem with it

 

[stummish]

@Lee42 the plate gives some nice mechanical protection, so you can bury at less than 50mm, but the other reason is the steel shores up the weak spot in the joist. Support strength comes from the top and bottom surface of a joist, the center doesn't do much to hold the rest up, so the steel replaces the lost strength is how I understand it.

Like I said though, never used them and my ideas are based on the wet toilet paper between my ears, not fancy evidence or proof.

 

[Lee42]

You will not need them to support the notch as looking at the picture they are not structurl joists. They look like 2 x 1 that have been nailed on over the top of the insulation so when plasterboarding they have something to screw to.
My main concern would be whoever is plasterboarding accidently screws through a cable. Which is why I would put plates over the notches.

Hope that helps

 

[davesparks]

If they won't batten the ceiling down then they can't have recessed lights or speakers, it's pretty simple really

 

[Lee42]

If they won't batten the ceiling down then they can't have recessed lights or speakers, it's pretty simple really

I agree on the speakers but there is recessed lights on the market that will fit in there.
The light in the picture i posted is only 25mm deep so once u add the depth of the plasterboard u will have enough room

 

[Toneyz]

I agree on the speakers but there is recessed lights on the market that will fit in there.
The light in the picture i posted is only 25mm deep so once u add the depth of the plasterboard u will have enough room

This light fitting is all well and good but the driver needs to go somewhere and not in contact/surrounded by insulation.

 

[ThomasW]

Hi everyone,

Thought I'd post here to see if any of you have wired new builds single storey, no loft with foil back insulation.

Its a high spec new build - downlights, data cables, speakers wires etc

I have attached a pic of the ceiling which has just been finished.

The problems i've got is there is barely a 40mm gap so drilling through will put me way out of regs. This stuff is stapled tight to ceiling so bit of a nightmare really.

Wondered what others have done to comply with regs.

Cheers, Jon

View attachment 36413

Before drilling any pre-fabricated roofing joists I'd talk to the manufacturer first because this might seriously weaken the structure. In my opinion there is always an opportunity to install cables at the lowest apex where no-one should be in a position to damage them and without drilling the structure.