Cold Deck Roof Insulation Thickness

This construction relies on a vapour control layer working effectively and in tandem with a continuous ventilated airspace to disperse the water vapour to atmosphere before it reaches the cold deck and condenses.

Cold deck roof insulation thickness.

Rigid board insulation rigid board insulation is the most common type of insulation used in low slope commercial roofing. This method of insulation can also be used to upgrade the thermal performance of an existing roof without affecting the waterproofing system. Lightweight insulating concrete lwic. There are two types of flat roof.

It is made from. Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof just above the ceiling. Cold deck flat roof the thickness of insulation required will vary depending on the material you decide to use and the manufacturer s specification. Cold roofs have insulation between the rafters allowing for ventilation space below your roof deck.

Cold roofs and warm roofs. Dual purpose structural deck and insulating planks. Ventilation is required for these roofs. Where insulation depth is restricted by the flat roof construction it may be necessary to install the roof insulation between and below the joists to create a cold deck structure.

Alternatively battens can be secured to the underside of the. Install baffles or make sure there s 1 minimum of airspace between the roof deck and insulation. In this case ventilation is required and the roof can still become wet with condensation which may cause materials to decay. A ventilation gap usually 50mm should be provided between the top of the insulation and underside of the roof covering to allow the air to flow across.

A cold roof has the insulation placed below the structural deck which thus remains cold. Or sprayed polyurethane foam spf. Ventilation openings either at. As for insulating below the joists an insulating laminate insulation bonded to plasterboard such as celotex pl4000 or a separate rigid pir insulation board finished with a separate sheet of plasterboard can be securely fixed to the joists to provide an internal finish to the 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.