You can create a warm roof or a cold roof by simply arranging the roof layers in a different order. With a cold roof, insulation is applied between the rafters, with a warm roof, insulation is applied to the existing roof surface.
Warm roof. On flat roofs, a warm roof is an insulating layer that is placed on the roof structure. This means that the apron and its supports have a temperature closer to the temperature inside the building.
The cold ceiling roof shown above has roof level insulation and must have a ventilated gap of at least 50mm. The gap must be ventilated on two opposite sides with a continuous ventilation opening of 25 mm. A vapor barrier is required on the warm side of the insulation to prevent condensation.
Warm roof. A warm roof is very easy to install and offers greater thermal output at the expense of a higher roof profile. Warm roof insulation ensures that the entire roof structure is insulated, making a warm roof more energy efficient than a cold roof.
In the case of flat roof constructions, the thermal insulation can be fixed above and below the roofing or waterproofing of the load-bearing roof. If placed under the building deck, ventilation under the deck is required. The closed hole on a warm pitched roof does not require ventilation.
Ethylene Polypropylene Diene Monomer (EPDM) is one of the most versatile rubber roofs on the market. Recognized as one of the best materials for flat roofs, rubber is a popular choice for industrial and commercial applications due to its ability to withstand extreme weather conditions.
Whether it’s cold or warm roofs, the main function of a VCL is to keep the air in the building warm and humid - inside the building. It is the first line of defense against the high pressure of vapor that penetrates the roof structure and causes interstitial condensation.
For a do-it-yourself flat roof installation, building a warm roof is much easier as it is less likely to break. This type of construction is not recommended if you plan to climb onto the roof after it is completed. Since you are actually stepping on the insulation, the roof will feel soft under your feet.
A cold roof is a roof where the thermal insulation layer is located between the roof beams so that everything on top of the insulation, such as beams and gutters, is cooler than the living space below.
Whether you are considering a unique roofing material made of thermoplastic polyolefin (TPO), polyvinyl chloride (PVC) or ethylene propylene diene monomer (EPDM), for a thickness of 60 thousandths you are probably looking for about 0.05 permanent (max. 0.10). This layer is classified as vapor impermeable and acts as a vapor barrier.
With cold roof systems, a vapor barrier is not required, this is for ventilation, it serves to dissipate moisture.
Warm flat roof: the insulation material is placed on the roof, not between the roof and the terrace. Cold flat roof: The insulation is placed between the rafters below the roof surface above.
With a cold roof, all insulation is between and below or completely under the joists or attics. There is no insulation at the top. This way the roof itself is kept cool. You just need ventilation with a cold roof.
This is how a cold gum becomes a hot gum. Block existing ventilation. Remove any insulation from under the deck. If you keep it here, it will create interstitial condensation. Attach the PiR insulation to the felt. Install a waterproof membrane, e.g. Single Y membrane. Plasterboard and foam for the bottom of the joists.
The quick installation of flat roofs Our experience shows that metal flat roofing sheets are one of the fastest and cheapest forms of roofing. And like other types of metal roof installations, a flat metal roof is no hotter than a house with other types of roof.
A cold roof is a roof where the roof and the tiles have the same outside air temperature. A ventilation and insulation system releases heat through the roof. A warm roof gives the snow direct contact with the roof terrace for warmth. Then it will melt and sink from the roof.