Flat Roof Insulation U Values

Ultimately selecting which product and value to use depends on many factors particularly thermal load.

Flat roof insulation u values.

Typical u values using rocksilk krimpact flat roof slab with single ply membrane. For more information see our articles and how to videos below. 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. 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.

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. Column b is for other extensions upgraded existing thermal elements non exempt conservatories and conversion of unheated buildings. The easiest way of getting a u value calculation is by using our free online u value calculator.

Easy to access calculations. 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. 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.

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. Free online u value calculator. 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.

The lower the u value the slower the rate of heat flow and the better the insulating quality. Rocksilk krimpact flat roof slab thickness mm 150mm concrete 40mm screed 13mm plaster. Specify your desired u value before immediately calculating the required insulation thickness and product selection. Ecotherm s u value calculator is simple to use easy to tweak and provides an instant u value.

The calculator can be used to calculate u values for floor wall pitched roof and flat roof insulation applications.