Warm Flat Roof Insulation Thickness

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.

Warm flat roof insulation thickness. The chosen insulation laid on top of this should be able to take the weight of anything put above it on the roof without compression or protected from compression by further sheeting. The insulation material for a warm flat roof should. 120mm of kingspan tr26 or similar will make the. The typical u value of an existing uninsulated flat roof is 1 5w m2k.

To calculate u values and insulation thickness specific to your project use our free online u value calculator. There are two types of flat roof. Flat roof insulation thickness. In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay.

Insulation in a warm roof. The required thickness of quinn therm flat roof insulation will depend on the desired u values. It should be of the maximum available thickness. Cold roofs and warm roofs.

Our u value calculator is free and simple to use for calculating u values specific to your roof construction design. The below u value table shows the required insulation thickness based on the typical warm flat roof construction outlined. If you are upgrading the roof to meet current thermal requirements then the thickness of insulation will vary depending on its thermal conductivity. This is placed over the roof joists and a board normally external ply is laid on top.

With a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same. The insulation for a warm roof will usually be boards of extruded polystyrene or rigid compressed boards of glass fibre or rock fibre. Reason i ask is because i m trying to work out whether my upstairs toilet waste pipe will be high enough to divert on top of the flat roof to the side of the house. These are can be supplied with rebated edges which interlock reducing the risk of uplift.

Thickness varies according to the manufacturer s specifications. Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling. The below table shows the thickness of insulation required for a typical warm roof construction with insulation fitted above the rafters. Although i m sure this can differ considerably depending on insulation etc can anyone tell me what the approximate thickness of a warm deck flat roof will be including joists.