Fixing holes around pipes

[njc123123]

I’ve just bought a house that has had a new central heating system installed in the last couple of years, before I bought it the house was rented and needs to be tidied up a bit.
When the central heating pipes were put in they dropped them though the celling and then went through a couple of walls. To get the pies around downstairs. This has left quite large holes around the pipes that I would like to fix.
Can anyone recommend how to do this?
Thanks

 

[dcdec]

Expanding foam, once dry cut off excess with a stanley knife to just short of flush, then fill to bring flush, rub down and spot prime with thinned emulsion.

 

[opps]

I second DCDEC

I would however recommend minimal expanding foam and that you buy the cleaner in case of accidents.

The filler to be used? I would opt for Red Devil One Time because it is so easy to sand an less likely to crack if the pipes get hot/expand.

 

[njc123123]

Thanks for the relays. I think I will try using filler. I’ve been told that you shouldn’t use expanding foam around copper pipes as it can be corrosive, not sure how true this is but don’t want to take the risk.
Thanks again.

 

[opps]

Thanks for the relays. I think I will try using filler. I’ve been told that you shouldn’t use expanding foam around copper pipes as it can be corrosive, not sure how true this is but don’t want to take the risk.
Thanks again.

Never heard that before, nor have I ever had an issue in the last 10 years.

AFAIK when cured it is totally inert

Here are the first few google results for "expanding foam corrosive". They seem to positively endorse the use of foam. Having skimmed through dozens of results I can find no one saying it is a bad idea, only people endorsing it or asking in the first place.

http://uk.answers.yahoo.com/question/index?qid=20090407062248AArIvg7

http://www.onepetro.org/mslib/servlet/onepetropreview?id=NACE-00070757

The main problem with using filler alone is that much of it will just fall into the cavity and will be prone to failure if pushed with a finger.

Update:

The poster has asked Dow Corning if there is any risk of corrosion.

http://webcache.googleusercontent.c...nd-Copper-Fittings+&cd=10&hl=en&ct=clnk&gl=uk

Update 2

Ask whoever gave the advice why copper immersion tanks are insulated with expanding foam... AFAIK the foam is applied directly to the copper and has the additional advantage of preventing oxidisation/corrosion

 

[njc123123]

opps, looks like I've been given some duff information. Thanks for correcting me.

 

[njc123123]

I've just searched pipe insulation on the B&Q website and expanding foam filler came up.

 

[opps]

opps, looks like I've been given some duff information. Thanks for correcting me.

kudos for checking in the first place.

 

[ironsidebod]

The SX Flame Guard fire foam from Toolstation specifically says it is safe to use (on the manuf. spec sheet) around pipes if that helps?