Online U-value Calculator
The Celotex U-value Calculator gives you instant access to calculating your required insulation thickness and product solution.
U-value CalculatorAre you on target for Part L?
This professional U-value calculator provides a much-improved service, allowing you to specify your desired U-value before immediately calculating the required insulation thickness and product solution.
"I use the members area of the Celotex website on a daily basis. In particular I use the U-value calculator within the member area because I can quickly produce U-value calculations for inclusion within my projects' specifications" - Robin Bradbury of Bradbury Design
"Thank you for the online U-value calculator, it is really easy to use. I plan to specify Celotex from now on. It's more commonly available and easier all-round" - Jon Gay, architect fom Lochaber
In order to access the Celotex U-value calculator and download your calculation pdfs, you must register for the members area, which is quick and easy!
How to access and use the Celotex U-value calculator
The following video explains how to access and step through using the online U-value calculator.
Our U-value calculator app is also available from the App Store.
If you require further help or advice on an already created U-value calculation and would like to speak with an advisor, please contact our Celotex Technical Centre on 01473 820850.
Lines are open Monday – Friday, from 8.00am – 5.15pm.
Please note, some products in the U-value calculator may not be available from stock and subject to minimum order quantities and extended lead times.