Xtratherm 50mm High Performance Polyisocyanurate Foam Insulating Sheet for Floor or Roof

Q: Anyone know whether this insulation is good for soundproofing?

This is heat insulation material. You need specific product such as :- http://www.wickes.co.uk/Knauf-Sound-Panel-Tapered-Edge-2400x1200x12-5mm/p/224657

Q: Can this item be used on a garage ceiling?

YES CUT JUST UNDERSIZE FILL GAPS WITH EXPANDING FOAM FILLER TO SECURE

Q: if this is placed onto cement floor, how much self levelling compound should go on top before tiling?

I myself would not use self leveling on top of Xtra therm cement i would rather use interlocking chipboard 3/4 inch thick, my floor with tiles has not moved at all in 10 years

Q: can it be used for loft conversion, before the boards go on, instead of the foil to the timber ?

Insulation between the rafters* For optimum thermal performance the unprinted foil surface should face the rafter air cavity.* Accurately measure the width to be filled between the inside face of the rafters, prior to cutting the board.* Use the Celotex Insulation Saw to cut the Celotex board at a slight angle, making the board width slightly oversized on onesurface to achieve a `friction it'.* Push the board into the void between the rafters until it is tight against the underside of the first layer of insulation.* To hold the boards in place, use battens along the side of the rafters.* Tightly fit the insulation to the ridge plate and carry over and tightly butt the wall plate at eaves.* A vapour control layer (VCL) should be installed to the underside of the rafters. A polythene sheet of higher vapour resistance isrecommended for high humidity areas such as kitchens or bathrooms.* Finish with plasterboard or other suitable sheet material, fixed to the rafters.

4.4/5

Product ID: 60556217

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Details

Material
Coverage
28 800 square
Item thickness
5E+1
Recommended uses for product
roof wall
Product dimensions
2.4L x 1.2W

📏2400x1200x50mm precise sizing

❄️0.022 W/mK ultra-low thermal conductivity

🏗️5kg lightweight for easy handling

Frequently Bought Together

Description

❄️ Stay ahead of the chill—insulate smarter, not harder!

TRUSTED BRAND QUALITY - Manufactured by Xtratherm or Celotex, ensuring premium performance and durability.
VERSATILE APPLICATION - Ideal for confined air cavities, sharp wooden frames, and multiple construction needs.
PRECISION CUT DIMENSIONS - Fits perfectly in floors, roofs, and walls for seamless insulation.
SUPERIOR THERMAL EFFICIENCY - Keeps your space cozy with industry-leading low lambda value of 0.022 W/mK.
LIGHTWEIGHT EASY TO INSTALL - At just 5kg, it’s hassle-free to handle and position, saving you time and effort.

Xtratherm 50mm Polyisocyanurate Foam Insulating Sheet delivers top-tier thermal insulation with a low lambda value of 0.022 W/mK. Sized at 2400x1200x50mm and weighing just 5kg, it’s engineered for easy installation in floors, roofs, and walls, especially in tight air cavities and wooden frames. Manufactured by trusted brands Xtratherm or Celotex, this sheet ensures superior energy efficiency and durability for modern construction projects.

Specifications

Manufacturer	Xtratherm or Celotex
UPC	799493546309
Product Dimensions	240 x 120 x 0.1 cm; 5 kg
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No
Item Weight	5 kg

Have a Question? See What Others Asked

Anyone know whether this insulation is good for soundproofing?

Can this item be used on a garage ceiling?

if this is placed onto cement floor, how much self levelling compound should go on top before tiling?

can it be used for loft conversion, before the boards go on, instead of the foil to the timber ?

Reviews

4.4

All from verified purchases

A**E

Top insulation

Really good price, I looked on loads of sites including the ones that delivered it and couldn't find it cheaper elsewhere

20.04.2019

C**S

Does what it claims

The product is fine. It is a bit pricey hence not 5 stars. Would buy it again when insulation of this type is needed.

5.12.2013

K**H

Five Stars

Perfect good sold insulation used in my extension

7.02.2016

B**L

SHAME IT WAS SO BADLY DAMAGED THE BUILDER SAVED WHAT ...

SHAME IT WAS SO BADLY DAMAGED THE BUILDER SAVED WHAT HE COULD TO COMPLETE THE JOB BUT SO MUCH WASTE

4.02.2016

M**X

Perfect

excellent

14.05.2015

B**H

Easy tonuse

Easy to cut and fit in a complex roofspace

2.01.2020

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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Great experience from order to delivery. Highly recommended!

1 week ago

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The product quality is outstanding. Exactly what I needed for my work.

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