Flat Roof U Value 2016

If you have a target u value in mind then the calculator will give you the thickness of insulation needed.

Flat roof u value 2016. 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. 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. U value of a flat roof. Column b is for other extensions upgraded existing thermal elements non exempt conservatories and conversion of unheated.

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. This u value calculator covers all the main ways of building walls flat roofs pitched roofs and floors using kingspan insulation. Flat epdm roof description. 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.

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. Column b is for other extensions upgraded existing thermal elements non exempt conservatories and conversion of unheated. R value state local al alabama 2015 alabama commercial energy code 2 r 25 3 r 25 state. A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value.

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. 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. The thermal transmittance or u value of the complete roof system is calculated in accordance with established international standards. Then simply adjust the thickness or the u value until you are happy and the calculator will do the rest.

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. Check our library of roof u value calculations. State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1. U value has an inverse relationship to r value.

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.