Wires through a wall, sealing the gap

[ssray]

The electrician has used a air brick to run wiring from the new consumer unit in the garage to the Rest of the house.

I was moving stuff today and there is quite a breeze coming through there, it's no longer a air brick as it's internal in the garage now.

I understand I can't use expanding foam, what else can I use please?
It's seems a fairly large gap to fill, it's currently behind some shelves, which is why I've only just realised why the garage is always freezing.

Ta Ray

[CharlesElliott]

I would use fire rated expanding foam.

[KTMsm]

I'd rather use something mouse proof - mortar would be my first thought

Technically mice could get through mortar but IME they don't, whilst they love eating foam

[Simon_GH]

Mortar would be my first choice but I wonder whether silicone would be easier if access is poor.

[Sheepshanks]

If it's blowing into the garage, where is air coming from?

[TA14]

Sheepshanks said:

If it's blowing into the garage, where is air coming from?

Yes. You'd think that it would be an outer wall but how would that square with it now being integral? No doubt a layout plan would explain everything.

[TA14]

If the air brick is no longer used then remove it, put a split duct, say 20mm, around the wire with a grommet at each end: https://www.screwfix.com/p/mk-semi-blind-cable-ent... remove the cavity sleeve, insulate and brick up at either side.

[Murph7355]

And a photo...

[Sheepshanks]

TA14 said:

... remove the cavity sleeve,

That's the bit I wondered about - if the airbrick is through into the house, then surely it'd be warming the garage up?

OTOH if it's venting the underfloor space of the house then blocking it up might not be a great idea.

[ssray]

Sheepshanks said:

That's the bit I wondered about - if the airbrick is through into the house, then surely it'd be warming the garage up?

OTOH if it's venting the underfloor space of the house then blocking it up might not be a great idea.

1930's house, large area accessable under the house.

The airbrick now can't work as it should as it's now internal.

I thought foam was a no no around cable as it causes the casing to harden ?

A picture.... it's behind shelving, I'd moved something yesterday and was a little surprised at the amount of breeze from the area

[Mr Pointy]

ssray said:

1930's house, large area accessable under the house.

The airbrick now can't work as it should as it's now internal.

I thought foam was a no no around cable as it causes the casing to harden ?

A picture.... it's behind shelving, I'd moved something yesterday and was a little surprised at the amount of breeze from the area

Have a look at this expanding foam tape:
https://www.youtube.com/watch?v=V6lZXjRR-1k

You could cut small pieces & push it into each hole - a bit like fitting a foam earplug. It's might be less likely to interact with the cable sheath.

[JimM169]

It's in a garage behind some shelves, I'd just slap some gaffer tape over it! No doubt breaking 30+ rules and regs!

[ssray]

Currently the plan is chop up some expanded poly or loft insulation shovel it in and mastic over it

[fido]

Unless it's a big hole use caulk or all-weather sealant. If it's a bigger hole then put a tube around the wiring sealed with aforementioned (so you can re-wire in the future) and fill around with cement. Make some brick powder and sprinkle over cement on the outside.

[netherfield]

CT1 will do the job.

[ssray]

Had some time this morning, initially I shoved some scrunched up bubble wrap type stuff and pushed it into the gap past the wires, then chopped up some expanded poly , I used ct1 around the edges to seal it and stick it together.

Went over it after and Jo more cold air, the garage felt warmer too