Flat Roof Insulation U Values

Specify your desired u value before immediately calculating the required insulation thickness and product selection.

Flat roof insulation u values.

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. 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. Ecotherm s u value calculator is simple to use easy to tweak and provides an instant u value. The saint gobain insulation uk u value calculator gives you instant access to calculating a proposed insulation thickness and product options or giving an indicative calculation on a proposed construction detail.

Easy to access calculations. Rocksilk krimpact flat roof slab thickness mm 150mm concrete 40mm screed 13mm plaster. Work through your own construction detail to get an early indication of the u value that this might achieve. Store u values in member project folders for future reference.

The easiest way of getting a u value calculation is by using our free online u value calculator. 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. Our insulation solutions for flat roof applications provide both excellent fire and acoustic performance in addition to high levels of thermal performance.

The lower the u value the slower the rate of heat flow and the better the insulating quality. 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. 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.

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

Typical u values using rocksilk krimpact flat roof slab with single ply membrane.