Flat Roof U Value 2013

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.

Flat roof u value 2013.

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. Check our library of roof u value calculations. 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. Insulation for walls including cavity walls solid walls and timber or steel framed walls.

The tables below show the suggested u values in england wales and scotland. Here s my 2 cents and insulation guide for a cold flat roof concrete slab floor internal stud wall and to find out what type and thickness of insulation. Flat epdm roof description. A lower u value indicates better insulation properties hence u value requirements usually specify a maximum 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. Flat roof u value 0 18 w m2k 2 warm deck flat roof the type of insulation for this is usually of a rigid type and the thickness will vary depending on the manufacturer s specifications. Insulation for flat roofs pitched roofs and balconies and terraces. The required u value will depend on the location of the project england scotland or wales type of building domestic or non domestic and the application floor wall or roof.

State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1 2010 2 r 20. R value state local al alabama 2015 alabama commercial energy code 2 r 25 3 r 25 state. U value of a flat roof. This is placed over the roof joists and a board normally external ply is laid on top.

Get a u value calculation from our free online u value calculator or our technical department. Thickness varies according to the manufacturer s specifications. Where not exempt a conservatory heated or unheated should be built to the same maximum u values as any other new work as listed in columns b and c of the table in clause 6 2 9 with the exception that glazing and framing elements forming the walls or roof of a conservatory are unlimited in area and should have a maximum area weighted. The thermal transmittance or u value of the complete roof system is calculated in accordance with established international standards.