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.
Check our library of roof u value calculations.
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.
State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1.
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.
Then simply adjust the thickness or the u value until you are happy and the calculator will do the rest.
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.
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.
A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value.
If you have a target u value in mind then the calculator will give you the thickness of insulation needed.
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.
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.
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.
Column b is for other extensions upgraded existing thermal elements non exempt conservatories and conversion of unheated.
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.
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.
Ecotherm s u value calculator is simple to use easy to tweak and provides an instant u value.
Flat epdm roof description.
The thermal transmittance or u value of the complete roof system is calculated in accordance with established international standards.
U value of a flat roof.
U value has an inverse relationship to r value.
