Pipe insulation recommendation?

[saveasteading]

Having had a crawl through the attic I notice lots of gaps in the armaflex type of pipe insulation. 

I could feel the heat off some.

 

Some is ancient, black, snd disintegrating. Another type is better but isn't keeping shape, so falling off. Te best looking, grey stuff spears to have shrunk in length.

 

I intend to retain what I can, with small infills, and replace the worst.

 

There seem to be many qualities and prices available.

Advice please on brands. I'll probably then get quotes for a lot with a thought that by the box should be much cheaper.

[marshian]

I used Tubolit by Armacell

 

Insulations4less had it in box qty so when I did all the pipework in the loft and under the void floor downstairs I managed to use a whole box of 22mm and 15mm

 

https://insulation4less.co.uk/products/tubolit-polyethylene-pipe-insulation-all-sizes?variant=39554327085109

 

I would however try to find a local supplier because insulation4less isn't great when it comes to cost of shipping for orders under £500

[marshian]

I meant to say as far as shrinkage is concerned - gluing the lengths makes a huge difference

 

The 250ml size comes with it's own in built brush applicator (Bigger sizes don't) - it's a contact adhesive which goes off fast but has a great bond

 

https://insulation4less.co.uk/products/high-temperature-pipe-insulation-adhesive-all-sizes

 

Also get a insawlator and a "pipe lager pro" mitre box and with off-cuts make up glued 90 deg bends in advance

 

https://www.amniosense.co.uk/sale-product/pipe+lagger+pro

 

I used off cuts to make up glued 60 or 90 deg soldered joints bends and "pulled pipe bends" in advance

 

 

Bear in mind I was working in a 2 to 3 ft crawl space under my ground floor so anything I could do to prepare for what I was doing in advance was a huge reduction in working time in a cramped enviroment.

 

Because I was doing both 15mm and 22mm diameter copper - I chose my insulation size so both sizes had very close outside diameters meaning that once the mitre box was set up it worked for both (so I hit the adjuster bolts with some thread lock after it came lose a few times and required resetting - been fine since)

[JohnMo]

I have a mix of armaflex but you need to shop about as prices vary hugely and lots of Climaflex. If it's exposed where a mouse will get, wrap in aluminium tape. If it's exposed to low temps do 25mm wall thickness, minimum 19mm.