Flat Roof Target U Value

The target u value for flat roofs on existing buildings other than dwellings are shown in table 4 below.

Flat roof target u value.

The quick free and easy way to find out the insulation thickness and the u value you need for your building project. Ecotherm s u value calculator is simple to use easy to tweak and provides an instant u value. Unsure what level of thermal performance you require. Flat roof or pitched roof insulation between rafters or roof with integral insulation.

This u value calculator covers all the main ways of building walls flat roofs pitched roofs and floors using kingspan insulation. The thermal transmittance or u value of the complete roof system is calculated in accordance with established international standards. Where a building has external walls with a u value poorer than 0 7 and a roof with a u value poorer then 0 25 then the more. When used in conjunction with spray applied foam any external weatherproofing must be of low vapour resistivity e g.

For the majority of flat roofs built up in a series of material layers each of a consistent thickness and performance the most appropriate calculation type is the combined method detailed in bs en iso 6946. Column b is for other extensions upgraded existing thermal elements non exempt conservatories and conversion of unheated. Insulation for walls including cavity walls solid walls and timber or steel framed walls. The u value calculator covers all the main ways of building walls flat roofs pitched roofs and floors using kingspan insulation products.

Get a u value calculation from our free online u value calculator or our technical department. Existing buildings do not require a target co2 emissions rate however they do require a target u value to meet for building elements walls floors and roofs. If you have a target u value in mind then the calculator will give you the thickness of insulation needed. Insulation for flat roofs pitched roofs and balconies and terraces.

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. Check out our guide on what performance is required for the uk insulation building regulations. 0 18w m k 140mm of walltite. Using a target based methodology for new buildings in standard 6 1.