State only ca california 2016 building energy efficiency standards 2 r 25 3 r 25 4 r 30 5 r 30 6 r 30 state local co colorado 2012 iecc.
Flat roof u value 2016.
Column b is for other extensions upgraded existing thermal elements non exempt conservatories and conversion of unheated.
U value of a flat roof.
U value has an inverse relationship to r value.
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.
Epdm rubber roof covering 19mm ply 50mm ventilated air layer protect vp400 plus lr membrane sip at specified thickness protect vc foil ultra insulating a vcl 25mm service void 50mm gyproc thermaline super.
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.
A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value.
The following table shows two different insulation options for an inverted roof in order to achieve a u value of 0 15w m 2 k.
This u value calculator covers all the main ways of building walls flat roofs pitched roofs and floors using kingspan insulation.
If you have a target u value in mind then the calculator will give you the thickness of insulation needed.
Column b is for other extensions upgraded existing thermal elements non exempt conservatories and conversion of unheated.
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.
Ecotherm s u value calculator is simple to use easy to tweak and provides an instant u value.
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.
State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1.
As with the chart the roof build up includes paving slabs a water controlling layer insulation 7 5mm holt melt waterproofing and a 200mm reinforced concrete deck.
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.
The thermal transmittance or u value of the complete roof system is calculated in accordance with established international standards.
Flat epdm roof description.
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 our library of roof u value calculations.
