Flat Roof Insulation U Values

When determining how much insulation you need don t guesstimate calculate.

Flat roof insulation u values.

The higher the r value the greater the insulation performance. Ecotherm s u value calculator is simple to use easy to tweak and provides an instant u value. England new dwellings. For more information see our articles and how to videos below.

The easiest way of getting a u value calculation is by using our free online u value calculator. 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. 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. 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. A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value. 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. Our guides to building regulations in england adl1a 2013 building regulations.

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. Ultimately selecting which product and value to use depends on many factors particularly thermal load. U value has an inverse relationship to r value. R value measures how well certain building insulation materials can resist heat.

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. Know exactly how much you need with our project calculators. The lower the u value the slower the rate of heat flow and the better the insulating quality.

Specify your desired u value before immediately calculating the required insulation thickness and product selection. Free online u value calculator. We provide u value calculations to show compliance with current building regulations standards and best practice. Work through your own construction detail to get an early indication of the u value that this might achieve.

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. These can be supported with a detailed report.