0 18w m k 140mm of walltite.
Flat roof target u value.
Insulation for flat roofs pitched roofs and balconies and terraces.
The quick free and easy way to find out the insulation thickness and the u value you need for your building project.
Using a target based methodology for new buildings in standard 6 1.
Get a u value calculation from our free online u value calculator or our technical department.
If you have a target u value in mind then the calculator will give you the thickness of insulation needed.
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.
The target u value for flat roofs on existing buildings other than dwellings are shown in table 4 below.
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.
When used in conjunction with spray applied foam any external weatherproofing must be of low vapour resistivity e g.
Insulation for walls including cavity walls solid walls and timber or steel framed walls.
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.
Unsure what level of thermal performance you require.
The u value calculator covers all the main ways of building walls flat roofs pitched roofs and floors using kingspan insulation products.
Then simply adjust the thickness or the u value until you are happy and the calculator will do the rest.
Check out our guide on what performance is required for the uk insulation building regulations.
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.
This u value calculator covers all the main ways of building walls flat roofs pitched roofs and floors using kingspan insulation.
Column b is for other extensions upgraded existing thermal elements non exempt conservatories and conversion of unheated.
The thermal transmittance or u value of the complete roof system is calculated in accordance with established international standards.
0 25 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.
