Condensate Pipe Insulation

shiraz99

Can anyone recommend some good pipe insulation for an external condensate pipe? It's a fairly old boiler install so standard 22mm condensate pipe which is currently wrapped in the standard, grey foam lagging which is now crumbling away so would like to replace it with something more suitable for the outdoors.

nofoollikeold

1. Armaflex.  
2. Outdoors shouldn't be run in normal overflow pipe (21.6 mm generally).  Once outside the thermal envelope of the property it should go into 32 mm, or 40 mm if a longer run.  

bjorn_toby_wilde

nofoollikeold said:

1. Armaflex.  
2. Outdoors shouldn't be run in normal overflow pipe (21.6 mm generally).  Once outside the thermal envelope of the property it should go into 32 mm, or 40 mm if a longer run.  

As above, the outdoor section should be in 32 or 40mm. It will look a lot better than pipe insulation too.  You can buy trace heating elements for pipe to frost protect but they’re not cheap.

shiraz99

I appreciate that the pipe should be routed into a larger pipe on the outside but as mentioned this is an old system and will be replaced at some point so just looking for a cheap, temporary fix with replacing the lagging on the pipes.

WIAWSNB

shiraz99 said:

Can anyone recommend some good pipe insulation for an external condensate pipe? It's a fairly old boiler install so standard 22mm condensate pipe which is currently wrapped in the standard, grey foam lagging which is now crumbling away so would like to replace it with something more suitable for the outdoors.

How long did the current lagging last for? And I presume the pipe didn't freeze in that time?

Cool. In which case, use the same stuff

If you want to protect it against UV, then give it a coat of paint - masonry paint should do - it sticks to most things - or any exterior paint you to happen to have.

grumpy_codger

shiraz99 said:

... grey foam lagging which is now crumbling away so would like to replace it with something more suitable for the outdoors.

This (essentially polyethylene)  insulation deteriorates because of UV and IMO should never be used outdoors.
I recently used something like this for my friend:

 

It's not polyethylene and has a foil layer that protects from UV.

You can also find this sort of insulation there:

bjorn_toby_wilde

UV stable waste pipe at £6.87 for 3m

https://www.screwfix.com/p/floplast-solvent-weld-waste-pipe-black-40mm-x-3m/23406?tc=VC2&gclsrc=aw.ds&ds_rl=1241687&ds_rl=1245250&ds_rl=1249404&gad_source=1&gad_campaignid=837555045&gbraid=0AAAAAD8IdPygSSTMbMT9mPs3rrVVFf5XM&gclid=EAIaIQobChMI6aG3yqbCjwMVqaNQBh3n2A1AEAQYASABEgKFAvD_BwE

Or go buy some Temu pipe lagging and a tin of masonry paint. How cheap do you want?