Warm Flat Roof Insulation Thickness

120mm of kingspan tr26 or similar will make the.

Warm flat roof insulation thickness.

Achieving a u value of 0 20w m meaning your roof will be better insulated than your walls will need 120mm thickness of rigid foam or 200mm of mineral wool or natural insulation. Inverted roofs are a type of warm flat roof where the insulation is above the waterproofing layer. In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay. Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling.

It should be of the maximum available thickness. However if we do not include removal of old roofing you are looking at about 7 50 to 9 00 per foot of roofing plus about 2 50 to 3 00 per foot of 5 thick insulation say about 10 12 per square foot. If you are upgrading the roof to meet current thermal requirements then the thickness of insulation will vary depending on its thermal conductivity. This means that the insulation should be highly resistant to water absorption for example an extruded polystyrene based product which will not be affected by water or repeated freeze thaw cycles.

Flat roof warm deck the type of insulation for this is usually of a rigid type and the thickness will vary depending on the manufacturer s specifications. The target should be to achieve a u value of 0 25w m2k or better. There are two types of flat roof. U value of a flat roof.

With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same. This is placed over the roof joists and an board normally external ply is laid on top. Insulating a flat roof with recticel powerdeck u recticel s powerdeck u offers 0 024 u value for thicknesses 120mm or more so it s a great thermal insulator as well as a strong and stable board for structural integrity. A lower u value indicates better insulation properties hence u value requirements usually specify a maximum value.

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. Thickness varies according to the manufacturer s specifications. Kingspan and recticel are the two of the most well known flat roof insulation brands and they re firm favourites of insulation superstore customers. To achieve this add 100 to 160mm of insulation above the structural deck dependant upon insulant conductivity.