filling hole in wall where cables used to be

[benpost]

i have a long (metre or so) gap in the wall about 1.5 inch deep and 1 inch high where i think cables used to be. how would i fill this ? it seems to big a gap to use standard filler.

ive seen this in the shop would it do the job ?

[RW]

[diyfixit]

You could use bonding plaster to do this. It's what they'd use on site for this sort of job. If you fill it so it's just below the surface and let it harden up a bit, you can then use finish plaster on top to get a nice flat result. If you're not happy doing the finish plaster then you could just skim it with regular filler and sand it smooth when it's dry. Hope that helps

diyfixit

[Andrew Gabriel]

Providing the wall is dry, I would just fill it with plaster. A large bag of plaster can be cheaper than small bag of filler.

You need to do it in two layers. The first layer fills the hole to within about 2mm of the surface, and then you do a finish coat for the final 2mm. You need finish coat plaster for the finish coat, and bonding coat for the bulk. You can make your own bonding coat from finish coat just by adding some PVA into the mix, so you can get away with buying only a bag of finish coat plaster. This bonding coat will shrink and crack as it sets, but that doesn't matter. Old/out-of- date plaster is good for this as it will set quickly.

If the wall has any chance of rising or penetrating damp, use a cement based mortar with a waterproofer additive for the bulk, and then plaster or a filler for the final 2mm.

[The Medway Handyman]

Use one of the lightweight filler like this

will fill that size gap in on go & doesn't need much sanding.

[The Natural Philosopher]

bonding plaster to 3 mm below finish level., then normal filler or skim plaster.

[benpost]

ok thanks for the advice, so either bonding plaster or lightweight ready made filler..

i have learned that for internal wall repairs use plaster and for concrete floors use sand/cement mix and aggregate as well if its a deep hole.

can you buy the sand/cement/plaster from standard diy shops? they seem to stock ready made stuff more than the basics.

also may i ask this product i linked to

already used some of that inside but now realise its meant for outside repairs (thats how little i know) will it be ok internally?

thanks everyone