Flat Roof Insulation U Values

Free online u value calculator.

Flat roof insulation u values.

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. We provide u value calculations to show compliance with current building regulations standards and best practice. 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.

Rocksilk krimpact flat roof slab thickness mm 150mm concrete 40mm screed 13mm plaster. U value of a flat roof 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. The easiest way of getting a u value calculation is by using our free online u value calculator. 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.

Easy to access calculations. Column a is for extensions where the existing dwelling s walls and roof u values are worse than 0 70 w m k in the walls and worse than 0 25 w m k in the ceiling. The calculator can be used to calculate u values for floor wall pitched roof and flat roof insulation applications. Typical u values using rocksilk krimpact flat roof slab with single ply membrane.

For more information see our articles and how to videos below. Store u values in member project folders for future reference. 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. Specify your desired u value before immediately calculating the required insulation thickness and product selection.

Our insulation solutions for flat roof applications provide both excellent fire and acoustic performance in addition to high levels of thermal performance. 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. Column b is for other extensions upgraded existing thermal elements non exempt conservatories and conversion of unheated buildings.

Ecotherm s u value calculator is simple to use easy to tweak and provides an instant u value.