No, a warm roof is made of warm flat roof insulation and is applied directly on top of the construction. For spans over 5m the gap should be increased to Should A Cold Roof Be Vented Roof Ventilation. As the waterproofing membrane is placed directly on the insulation there is no need for any ventilation. Ventilation for cold flat roof - DIYnot Forums A warm flat roof usually does not require ventilation. A warm flat roof usually does not require ventilation. It is nearly always required, with the exception of dwellings with warm flat roofs that are already built. . Do you need to vent a flat 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. As for cold flat roofs, which are more common, they need this type of ventilation because they collect higher amounts of condensation during the winter. Soffit vents are roof ventilation devices installed underneath the eaves of a roof that extend past the warm wall line. Read remaining answer here. When thermal insulation is placed below the deck, the ventilation must also be on the . Flat roof ventilation allows for the circulation of air in the property, particularly for warmer rooms in residential buildings. When placed below the structural deck; ventilation is required to the underside of the deck. For cold flat roofs, the vapour layer needs to be positioned underneath the insulation layer, on top of the room below to create an effective barrier. There are several reasons why you don't want to vent a flat roof: 1. I'm debating on - Answered by a verified Structural Engineer . It is an airtight construction with no air gaps. It is universally recommended that cold deck flat roof construction should be avoided. Cold deck: Insulation between joists (ventilation required) The term warm/cold deck is usually limited to flat roofs If you have a cold deck roof and want a warm deck one instead then strip off the old felt and use rigid insulation above the old deck (kingspan/celotex etc) The enclosed void of a warm pitched roof does not require to be ventilated. (The floors or lower part of a poorly ventilated attic are cold while its ceiling or upper parts are warm.) When thermal insulation is placed below the deck, the ventilation must also be on the underside. It was warm but not overly hot. No insulation is on top. It's almost always needed, except for houses that already have warm flat roofs. This is easily achieved with gable vents or roof vents, air spaces between the insulation and the sheathing, and ventilated soffits. In fact you were. , How . See design advice for specific building types in section 2.6.1. What space do I need to allow for the ventilation? Does a warm deck flat roof need ventilation? When properly combined with other roof ventilation devices, soffit vents allow fresh air to enter into an attic creating air flow. Flat roof ventilation allows for the circulation of air in the property, particularly for warmer rooms in residential buildings. Ventilation is not needed in a warm roof. To ensure sufficient ventilation, enough space must be provided to allow for the movement of air, preventing the risk of condensation forming within the roof. Ventilate the roof void on two opposing sides with a minimum 25mm continuous ventilation strip. Any type of roof, from TPO to EPDM, can be either hot or cold. In the instances where a warm flat roof has been laid, ventilation isn't usually required. The homes are much warmer during winter months, and the hot air sticks to the cold roof, which becomes very moist. Roof is flat fibreglass so no over fascia vents like you would do with pitched roof. How much of a gap do you recommend for ventilation? Ventilation, vapour control and insulation. When thermal insulation is placed below the deck, the ventilation must also be on the underside. Like a cold roof, warm roof ventilation is required at high and low level to remove moisture-laden air from the roof space and comply with Approved Document C and the British Standards BS 5250. The vapour control layer is above the decking but below the insulation. In the instances where a warm flat roof has been laid, ventilation isn't usually required. As the waterproofing membrane is placed directly on the insulation there is no need for any ventilation. Does a roof need ventilation? Flat and low-slope roof designs to avoid moisture & condensation problems Flat roofs call up a whole new breed of building moisture problems How to avoid moisture traps under flat roofs Avoid mold & rot caused by moisture trapped under un-vented flat roofs Questions & answers about the cause, cure & prevention of moisture problems in flat roofs and similarly hard-to-ventilate structures. It's almost always needed, except for houses that already have warm flat roofs. A warm flat roof usually does not require ventilation. In flat roof construction thermal insulation can be placed above and below the structural roof deck or waterproofing layer. You only need ventilation in a cold roof. A warm deck roof is much easier to install, offers great thermal performance but adds height to the flat roof. Most building codes allow for unvented roof construction. You can ventilate flat-roofs, but under very specific conditions. The positioning of the ventilation depends on whether it is a cold or warm roof. In the instances where a warm flat roof has been laid, ventilation isn't usually required. Ventilation benefits a roof when it's hot outside as well. For spans over 5m the roof void should be increased to 60mm. Warm roof ventilation specification For a simple duo-pitch roof, BS 5250 specifies sufficient ventilation as being: When thermal insulation is placed below the deck, the ventilation must also be on the underside. A vapour control layer is required on the warm side of the insulation to combat condensation. Does a warm roof need a vapour barrier? Roofs shall have adequate precautions against condensation and cold. Flat Roof Vent for Bathroom Fan - What Do I Need and How to Install I am starting a garage conversion and part of it will be a bathroom with shower. It is an airtight construction with no air gaps. What space do I need to allow for the ventilation? Accordingly, does a warm flat roof need ventilation? If you put insulation under the decking and between the joists you lower the temperature of the decking and lower the due point thus bringing it closer to the danger point of being in the building. The answer depends on the type of roof you have: a cold roof or hot roof. 2. On the face of it a simple question with, one may think, a simple answer. Iirc celotex dont support warm roof construction with their products in a flat roof. Flat Roof Vent for Bathroom Fan - What Do I Need and How to Install I am starting a garage conversion and part of it will be a bathroom with shower. I need to vent the 50mm gap above the ceiling insulation on a cold deck flat roof. A warm roof is a type of roof construction which has an insulation layer above the rafters, and immediately below its weatherproof membrane. I'm in the roofing stages of building my man cave. On the contrary, warm flat roofs are equipped with a solid sheet of insulation that is placed directly atop the existing surface. approx 4 sqm floor space. As for cold flat roofs, which are more common, they need this type of ventilation because they collect higher amounts of condensation during the winter. Ice dams - If your attic doesn't have enough ventilation, warm air becomes trapped inside and increases your roof's temperature, which in turn melts the snow on top of the roof. pipework. Click to see full answer. approx 4 sqm floor space. A warm flat roof is formed by placing a layer of insulation over the top of the roof structure. Based upon the comments above, why would you vent an area that your trying to control the heat and moisture? Required to be ventilated ; however, where vapour does a warm flat roof need ventilation underlays are,... 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