When determining how much insulation you need don t guesstimate calculate.
Flat roof insulation u values.
Reference table for u values u value is the coefficient of transmission i e the transmission of heat through the materials which compose the building s envelope or outer shell.
Know exactly how much you need with our project calculators.
Free online u value calculator.
U value has an inverse relationship to r value.
Ecotherm s u value calculator is simple to use easy to tweak and provides an instant u value.
A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value.
Our guides to building regulations in england adl1a 2013 building regulations.
Specify your desired u value before immediately calculating the required insulation thickness and product selection.
To comply with part l of the building regulations 2010 all roofs to rooms except those in unheated buildings should be thermally insulated to a maximum u value of of 0 18 w m k.
Work through your own construction detail to get an early indication of the u value that this might achieve.
Ultimately selecting which product and value to use depends on many factors particularly thermal load.
England new dwellings.
Our u value calculator is a free online tool which will help calculate the required thickness of insulation to achieve the desired u value.
The saint gobain insulation uk online u value calculator covers a variety of different insulation applications.
The calculator can be used to calculate u values for floor wall pitched roof and flat roof insulation applications.
A u value of 0 55 w m k is used for cavity insulation and 0 30 w m k for internal or external wall insulation.
The higher the r value the greater the insulation performance.
U value of a flat roof.
Regardless ashrae s new above deck roof insulation standard is a good place to start as it jumped 33 percent from r 15 to r 20 in five of six climatic regions.
For more information see our articles and how to videos below.
These can be supported with a detailed report.
Column b is for other extensions upgraded existing thermal elements non exempt conservatories and conversion of unheated buildings.
Providing you with instant calculations all day everyday with step by step options and hints and tips along the way the no jargon u value calculator takes you through your construction build up until each element is included.
We provide u value calculations to show compliance with current building regulations standards and best practice.
The lower the u value the slower the rate of heat flow and the better the insulating quality.
For example a building with material with an r value of r 11 converts to an u value of 0 09 1 r or 1 11 0 09.
