Foam pipe lagging vs foil wrap
Updated: 23 October 2026
You have a grey tube and a silver roll, and the search called both pipe insulation. A 3.8 mm foil wrap is not a stand-in for 13 mm of foam. This page is foam pipe lagging vs foil wrap: the tube is the body of the job, and the roll is only the fitting. The [pipe insulation comparison](/hub/diy-supplies/pipe-insulation) holds the prices and the bores. The Products Compared editorial team compared the amazon.co.uk listings saved on 21 October 2026. We did not measure heat loss in a lab. A purchase through that table can earn us a commission at no extra cost to you.
You have a grey tube and a silver roll, and the search called both pipe insulation. A 3.8 mm foil wrap is not a stand-in for 13 mm of foam.
You have a grey tube and a silver roll, and the search called both pipe insulation. A 3.8 mm foil wrap is not a stand-in for 13 mm of foam. This page is foam pipe lagging vs foil wrap: the tube is the body of the job, and the roll is only the fitting. The pipe insulation comparison holds the prices and the bores. The Products Compared editorial team compared the amazon.co.uk listings saved on 21 October 2026. We did not measure heat loss in a lab. A purchase through that table can earn us a commission at no extra cost to you.
Our top picks
| Badge | Product | Form | Wall | Bore | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Climaflex Climaflex 22 mm, 13 mm wall, 10 m | Slit PE tube | 13 mm | 22 mm | 7.6 | about £11.05 | View offer |
| Alternative |  Fabian Clarke London Fabian Clarke foil wrap, 7.5 m | Foil wrap | 3.8 mm | No bore | 7.0 | about £6.89 | View offer |
 K-FLEX K-Flex 15 mm self-seal, 2 m | Self-seal tube | 9 mm title | 15 mm | 7.4 | about £8.99 | View offer |
On this page
They are not the same thickness
A domestic tube is a sleeve with a hole. Climaflex is closed-cell polyethylene, a 13 mm wall for 22 mm pipe, at about £11.05. K-Flex is a 9 mm self-seal tube, 15 mm bore, at about £8.99, and the only kept listing that prints a lambda. The wall is the insulation.
Fabian Clarke's foil wrap is a sheet, 7.5 m by 80 mm and 3.8 mm thick, at about £6.89, with no bore. MaxEarn and XIDEAN are 5 mm tapes. None of the rolls prints a lambda or a fire class. Do not call this bubble roll phenolic. Thirteen millimetres of polyethylene against 3.8 mm of foil is a different amount of material. Homebuilding describes tubes as the common domestic buy and tape as something for short sections.
Use a tube when the pipe is straight and the bore matches
Use a sized tube on every straight metre, as long as the hole matches the outside of the pipe. For 22 mm, Climaflex is slit with no adhesive, so you tape the seam. For 15 mm, K-Flex prints about 0.033 W/(m·K) at 0 °C, and UK reviews sometimes find the self-seal strip missing or unwilling to stick. For 28 mm, LavaTherm is the 2 m self-seal tube. The pick by diameter is best pipe insulation. The order of measuring is the pipe lagging buying guide.
The wall is continuous and the bore is chosen, so you are not guessing how many turns of 80 mm sheet make a 13 mm coat.
Use foil or tape when the tube will not go
Use the wrap on the fitting and tape it. The Fabian Clarke roll does not list adhesive. Reviewers add aluminium tape or foil tape. All sizes means there is no bore, and there is no lambda, so this page will not say the silver roll saves more energy than the grey tube.
The stated coverage is 0.6 m² of sheet, 7.5 m times 80 mm. Do not treat that as 7.5 m of lagged pipe. How you cut and tape it is how to lag pipes. MaxEarn is the self-adhesive 5 mm tape, two 10 m rolls at about £14.59. A bullet calls it a foam tube. One UK reviewer called it very thin.
Outside, the roll is not the jacket
Buy Insulation Online notes that bare polyethylene breaks down in prolonged sun and rain, so foil on its own is a weak outside finish. Use the tube for the straight metres you measured. Use foil or tape for the elbow, the reducer, and the tap body. Tape the wrap. Do not treat the roll as the cheaper tube.
Common questions
Is foil wrap the same as foam lagging?
No. Foam lagging in this set is a tube with a 9 mm or 13 mm wall and a bore for 15 mm, 22 mm, or 28 mm pipe. The Fabian Clarke foil wrap is a 3.8 mm sheet, 80 mm wide, with no bore and no printed lambda. They share a keyword on amazon.co.uk. They do not share a thickness or a way of fitting.
When is a tube the wrong shape?
When the pipe is not straight enough for a sleeve to pass: a tight elbow, a reducer, a tap body, or a stopcock. Stretching the tube around that fitting thins the wall. That is the moment for a wrap and tape, after the straight runs are already in a sized tube. A 15 mm tube on 22 mm copper is the wrong bore, solved by measuring, not by foil.
Does the silver roll include adhesive?
The Fabian Clarke listing does not include adhesive. UK reviews describe aluminium tape or foil tape added by the buyer. MaxEarn's foil-foam tape does list a self-adhesive backing, and it is 5 mm, not 3.8 mm of bubble. XIDEAN felt lists adhesive too, and two of three reviews say it peeled. Read the closure line before you assume the roll sticks.
How much pipe does 7.5 m of wrap actually cover?
Not 7.5 m of pipe, if you spiral it. The roll is 7.5 m by 80 mm, stated as 0.6 m² of sheet. One reviewer put the linear cover at about 1.5 m on a pipe around 20 mm when spiralled. That is a single review. Overlap uses the roll faster still. Measure the fitting you are wrapping, and keep a tube for the straight run.
Is felt tape a third option?
It is a third product, and a weak one in this set. XIDEAN is 4 m of 5 mm polyester felt at about £11.99, rated 2.6 from three reviews. Two buyers said the adhesive failed, one of them overnight above freezing, and one added foil tape. A bullet that mentions rain and sun does not overturn those three reviews.
Can I use foil on an outside pipe and stop there?
You can wrap a short exposed fitting, and you should tape it. A long outside run at 3.8 mm, with no lambda, is not the 13 mm waterproof layer a condensate guide asks for, and it is not a substitute for a tube on straight pipe. The foil is the awkward bit.
Which one is better for a long straight loft run?
The tube, matched to the outside diameter, with the seam taped. Climaflex at 13 mm for 22 mm pipe, or K-Flex at 9 mm for 15 mm, covers that run without a spiral. Foil at 3.8 mm is thinner and slower to fit.
Related pages
Sources
Public UK sources and the amazon.co.uk listings compared on this page. Listings captured 21 October 2026. Updated 23 October 2026.
- Approved Document L, Volume 1 (2021, 2023 amendments) (retrieved 23 October 2026)
- BSI, BS 5422:2023 (retrieved 23 October 2026)
- Rockwool guide to BS 5422:2023 (retrieved 23 October 2026)
- Energy Saving Trust: insulating tanks and radiators (retrieved 23 October 2026)
- Thames Water winter tips, December 2025 (retrieved 23 October 2026)
- WaterSafe winter advice (retrieved 23 October 2026)
- HHIC condensate guide (retrieved 23 October 2026)
- B&Q: how to insulate water pipes (retrieved 23 October 2026)