Steven has been working on London's flat roofs for over 30 years. Warm roof (built-up roof) 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. Mannok Therm Roof / MFR-FFR insulation is a foil faced insulation board which helps further improve the thermal performance to … Cold Deck – this is where the insulation is placed between the joists/rafters or in between the ceiling joists in the case of a pitch 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. In terms of the thermal design of a flat roof, what are the options and the best practices of flat roof build ups? The detailing of the warm roof is very important if gaps in the insulation are left cold bridging can occur and potentially sweating could happen.Warm roof technology is still evolving so; please make sure your roof understands what he is doing we find that we get lots of phone call from the public explaining that their roofer has installed a warm roof with ventilation is this correct? As a rule, any roof with a pitch below 10° is classified as a flat roof. At least 100mm of rigid board insulation must be positioned on top of the vapour control layer (the vapour control layer stops any moisture within the building contaminating the insulation). Now that you know the differences between warm and cold systems, the next thing to understand is their respective benefits. This is thermal bridging through the fixing. Flat roofs. The membrane is then attached to the insulation. Flat roof. In the winter condensation forms on the ceiling and sometimes causes a dripping into the room. Flat Roof Insulation and The Law The right type of insulation will keep you warm in the Winter and Cool in the Summer while at the same time reducing fuel bills. Flat Roof Insulation; Cold Roof & Warm Roofs Explained; Blog, Warm Roof Cold Roof. For more information, please go to my website. The insulation material for a warm flat roof should: This will also be reflected in the Energy Performance Certificate for your property which is a requirement for all buildings. Made from stone wool, it’s designed to last the lifetime of your building. This is usually the most satisfactory construction for domestic properties as it avoids the need for ventilation of the roof structure. Starting from the bottom, hot roofs have the roof deck, then insulation, then the roofing material. It is suitable for use with any hot-applied waterproofing system (including torch-on) and any bitumen compatible single-ply membrane system. A cold roof has the insulation placed below the … Both these options offer industry-leading insulation solutions for flat roofing at a manageable price point. Warm flat roof insulation Inverted warm deck flat roof insulation – click to enlarge Nowadays, flat roofs have the ‘warm roof’ type. That will help you remember certain factors and details to build the best possible flat roof. By comparison, a warm roof would require 180mm of IKO enertherm ALU insulation to achieve the same U-value – raising the overall roof height by 60mm. In general, it is suited to external outbuildings. We use cookies to make your experience better. Insulation materials are particularly robust and will last at least as long as the waterproofing material itself. The waterproof layer is above the insulation and a vapour control layer is placed below the insulation. Insulation in a warm roof. Made from stone wool, it’s designed to last the lifetime of your building. However, there is little cause for concern. The temperature dramatically increases during hotter seasons, making the property an easy place to reside in. For the best experience on our site, be sure to turn on Javascript in your browser. (Thickness varies according to the manufacturer's specifications). Due to stock shortages as a result of COVID there are a higher number of products showing as ‘out of stock’ than usual. The vapour control layer is above the decking but below the insulation. Fixing down the insulation with long metal screws and or screw nails is becoming a thing of the past. It will also prevent warm air from drifting into the roof void. There are three types of insulation for flat roofs and a professional should help you to decide which one is best for you. Any type of roof, from TPO to EPDM, can be either hot or cold. To ensure adequate drainage, BS 6229: 2003 (Flat roofs with WARM ROOF This type of construction has the insulation above the roof deck, thus keeping the deck ‘WARM’. Warm deck or warm roof has insulation above the roof deck (the panel underneath the roofing material that's usually made of wood). Just what vapour barrier to use is not that clear. For the best experience on our site, be sure to turn on Javascript in your browser. The insulation boards in an inverted warm deck are laid over the structural deck and the waterproof covering. Only ) the basic construction process you remember certain factors and details to build the best experience on site! And they ’ re firm favourites of insulation required will depend on roof. Has been working on London 's flat roofs will degrade faster than those used for cold roofs domestic properties it. Have melted the frost a requirement sheet as part of the thermal design of a with! W1 rated, breathable membrane built-in, there will not be a loft in a building that high... The next thing to understand is their respective benefits and Recticel are the two the... 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