What is a warm roof and a cold roof?

What is a warm roof or a cold roof? … In a cold roof, the insulation is applied between the rafters, but in a warm roof, the insulation is applied on top of the existing roof surface.

What is better cold roof or warm roof?

A warm deck roof can be very simple to install and offers higher thermal performance at the cost of a higher roof profile. … Warm roof insulation ensures the entire roof structure is insulated, meaning a warm deck roof is more energy efficient than a cold roof.

What is warm roof?

A warm roof is a type of roof construction which has an insulation layer above the rafters, and immediately below its weatherproof membrane. … A warm roof construction allows heat to be conserved within a property – without the need for a ventilation system.

What is cold roofing?

A cold roof is roof in which the thermal insulation layer is located immediately above or between the ceiling joists meaning that everything above the insulation, such as the rafters, and any roof space, will be colder than the living space below it.

Is my flat roof warm or cold?

In flat roofing, the term ‘warm’ or ‘cold’ applies to the structural substrate, typically a plywood, OSB, profiled steel or concrete roof deck. When the insulation layer is laid on top of the roof substrate or deck we call this a warm roof.

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Can you turn a cold roof into a warm roof?

Cold bridging occurs when there is a continuous path created through the insulation. If an existing cold roof is to be refurbished, consideration should be given to converting the design to a warm roof, or incorporating new insulation into the roofing system to improve thermal performance.

Do I need to ventilate a cold roof?

Cold Roofs

A cold roof is where all of the insulation is placed either between and under or completely under the joists or deck. No insulation is on top. In this way the roof itself is kept cold. You only need ventilation in a cold roof.

What are the advantages of a warm roof?

Advantages of Warm Roof

Insulation on the entire roof structure keeps all the components in the roof space at the same temperature. Therefore, there is reduced thermal bridging which prevents heat loss from the living room. Houses with warm roofs are less expensive to keep warm than those with cold roofs.

What is a cold flat roof?

The alternative roofing insulation design places the insulation layer between, or under the timber rafters – level with the ceiling joist. This therefore leaves the roof and timbers cold, requiring a breathable membrane between the insulation and roof structure.

Can you put insulation between joists on a warm roof?

Why you can’t just insulate between the rafters

The general advice we give is that you should always insulate between and above the rafters (warm roof) or between and under the rafters (cold roof).

What is a warm flat roof construction?

A warm flat roof or a built-up roof (BUR) is one where all the insulation is above the joists/deck, making them part of the warm fabric of the building. The insulation is immediately below the waterproofing layer. The vapour control layer is above the decking but below the insulation.

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