Armaflex Selfseal (13 WALL x35 PIPE) Class O Pipe Insulation, 13mm wall, suits 35mm diameter pipe, 2 metre length

Very good protection for outside boiler condensate pipe to prevent freezing on winter.If this pipe freezes, it stops boiler from working, so definitely work applying to reduce risk, as it's nice and thick.

Ideal component

item arrived early it was very easy to fit

Does actually what it says all round good insulation.

Firstly the condition of the armaflex was not good. It has obviously been stored for a long time and lost its shape. Secondly it was wrapped with cello tape which even when carefully removed, left the surface of the armaflex looking seriously grazed and exposed to the elements. Lastly be careful when pressing the two sides together because it is so sticky that if by chance one side sticks to the pipe it'll not prise off easily, but it is good that it is sticky. Lastly it is flexible enough to go around ninety degree elbow joints without the need to cut it. I would have returned it but it arrived in a box the size of a fridge. It does not look nice when installed but hopefully it'll do the job.Just an addendum here; I found that this armaflex becomes sodden with condensation which will freeze solid if temperatures remain below zero day and night for an extended period of time as we have experienced recently. This is something to consider when purchasing. I do not think it is designed to be used outdoors. Therefore deducted a star.

Great product

I bought this for an outside pipe after the cold spell we had. The old insulation was firmer foam but it had perished. This looks like it will last much better.

We had to replace our 30 year old boiler recently, which meant the new one was a condensing boiler. Because of the configuration of our property, the condensate pipe had to be installed on an exterior wall - this means it’s vulnerable to freezing when temperatures get particularly low. Anyway, I did some research, and felt that this insulation from Armaflex offered the best budget solution.I do like that you get a 2 metre length, which was plenty for my requirements. This fits snugly on our 35mm diameter pipe, and has an insulating thickness of 13mm. I found it was fairly easy to install, you just need to remove the two strips of white tape so that you can work the tube around the pipe and join it at the rear - the adhesion is very good, so take your time getting a nice, secure fit. The insulation is very flexible, so I had no trouble working it around bends. To keep everything securely in place I used 10x nylon ties. In addition, because there was only a short bend where the pipe goes in the wall, I ran the insulation several inches above the bend before plugging it with some of the insulation left over. I then placed a cap on top to prevent any rain/moisture entering (I used a plastic yoghurt pot which I sprayed-painted black).Since installation we’ve had a few nights of minus C temperatures, but our condensate pipe hasn’t frozen up - so that’s a result in my book. This insulation does the job it’s meant to do, it’s fairly easy to install (only tools I used were a pair of pliers and a pair of scissors), and it’s reasonably priced - so I have no hesitation recommending this product to you.