Cold deck flat roof

The cold deck roof as shown above has the insulation at ceiling level and must have a ventilated cavity of at least 50mm. The Cold Deck is the most common but also the least thermally efficient design of roof insulation. In the case of a flat roof the roof deck and . Find out the different between warm flat roofs and cold flat roofs.

See the advantages and disadvantages from both roof designs. Less thermally efficient than a warm roof construction, cold roof construction remains the most common form of construction for existing flat roofs.

A properly specified warm-deck flat roof will deliver vastly improved energy efficiency over the traditional cold - deck design. The recognised flat roof build ups for best design practices are:. A cold roof construction will normally comprise of a structural deck on joists or . This video shows the key features of a flat roof cold deck construction and how to draw the details to a scale of. Hopefully this video will help explain the difference between cold flat roof construction and warm flat roof.

A warm roof is defined as being when the all or the majority of the insulation is above the joists or deck. We discuss ventilation for warm and cold flat roofs. A cold flat roof is one where the insulation is between or between and below the.

This is a similar construction to the warm roof as insulating above the deck. It is universally recommended that cold deck flat roof construction should be avoided. Where the insulation is placed above the structural deck . There a two distinct styles of flat roof construction in home flat roofs. These are cold deck and hot deck flat roofs and as the names suggest the . The building industry uses the terms WARM ROOF and COLD ROOF to describe.

Traditionally, flat roofs simply consisted of a structural timber deck with a waterproof covering directly applied to the top of the deck. In a flat roof , the waterproofing is always supported by a structural roof deck. Warm Deck – The type of insulation for this is usually of a rigid type . Cold flat roofs are where the insulation is placed between the joists under the flat. Can an existing cold flat roof be converted to a warm deck insulated roof? There are two main types of roof – pitched roofs and flat roofs.

When thermal insulation is placed below the deck , the ventilation must also. This specifically relates to cold flat roofs which require ventilation . OverviewIf a flat roof is your chosen method of construction then a range of. A cold roof has the insulation placed below the structural deck , which thus remains. In a warm deck roof the insulation is positioned above the structural deck and no . A traditional cold deck flat roof has the insulation laid directly on top of the ceiling, and the space above this has to be ventilated to the outside .

Home Ventilation in Roofs Flat roof Cold Deck. This form of construction has been adopted from flat roofing , where a structural deck is. Insulation for Sarnafil and EPDM flat roofs in and around the Thames Valley. In some cases this construction may have to be ventilated to avoid condensation.

Also current regs state all new coverings should be warm deck. Separate Roofing ratings are the provided for the following building types: Domestic. Warm deck flat roof insulation is now the standard way to insulate a flat roof – click to enlarge. Polyroof 1ventilated cold roof system installed on a domestic project. Glidevale FV2vent can be installed at both a flat roof edge and a flat roof.

I am leaving a 50mm air gap between the decking and the insulation and ventilation as required. Converting flat roof from cold to warm roof. Ventilation is required to cold roof voids to disperse water vapour and reduce the risk. Cross-ventilation should be provided for all insulated cold deck flat roofs , . Our new flat roof has moved from being a warm roof to a cold one after.

You can have a cold deck , with the void between the joists filled fully . Traditional cold felt flat roofs have ceiling joists on which a decking is placed. Felt is then added in different number of layers as a roof finish. Where a cold flat roof does incorporate insulation this is in the form of mineral wool . Thermal insulation in cold roofs is placed under the structural deck , between the joists.

On the other han in warm flat roofs insulation is laid above the structural . Celotex Crown-Bond typically 120mm to achieve. A single-layer, non- ventilated flat roof is classified as either a “non-insulated .