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Ventilation is required for these roofs. This assembly is also called a conventional or built up roof. Apr 27, 2017 - When it comes to insulating a flat roof, there are two options. The theory behind a hot roof system is that rather than allowing heat to escape through your roof, you contain it in your attic space, which can save on utility costs… in theory. If you're unsure as to the difference between warm roof insulation and cold roof insulation, keep reading. But, what exactly is the difference, and why should you bother getting a warm roof to combat damp? Warm Roof. In the case of a flat roof the roof deck and waterproof membrane are supported on joists, the internal ceiling is attached to the underside of the joists and should have a vapour barrier to stop condensation penetrating the internal decor. In a warm roof assembly, you place a rigid insulation layer above the structural deck and then place the membrane over that. Roof Construction Guide: Flat, Pitched, Cold & Warm Roofs. This results in the structural deck and its supports being at a temperature closer to that of the building’s interior. Ventilated roof space. Cold roof - Designing Buildings Wiki - Share your construction industry knowledge. 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. Should condensation occur it could damage the decking and/or timbers, internal ventilation gaps were added between the insulation and the roof deck to reduce this, but as this may not have been enough external ventilation was often added too. Hot roof designs for un-vented roofs, aka dense-packed insulated sloped roofs: This article describes various cold-climate building solutions for un-vented cathedral ceilings and similar under-roof spaces, offering advice on how to avoid condensation, leaks, attic mold, & structural damage when roof venting is not possible. In a warm roof construction the principal thermal insulation layer is located above the structural decking, resulting in the structural deck and support structure being at a temperature close to that of the interior of the building. When Flat Roof Construction Goes Wrong. This ‘cold deck’ construction is considered problematic in the humid, temperate climate of the UK where the effective ventilation of restricted roof voids may be impractical, particularly in sheltered, built-up areas. Zinc Roofing Warm vs Cold Roofing. A sealed warm roof construction can also be achieved by creating a 50mm ventilated air gap between the surface of the insulation and the undertile lining to allow water vapour to be safely removed from the roof construction. Zinc warm vs cold (unvented vs vented) Sign in to follow this . I have a flat roof that is a cold roof. In this video our Principal Estimator – Steven Dickinson goes into detail about the differences between warm roof and cold roof constructions, including, thermal bridging and vapour barriers. However, because the roof is a ‘cold’ roof, condensation could occur if warm air trapped by the insulation came into contact with it. The choice of construction theoretically rests on two different methods of handling moist air. 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) egon999, Jun 13, 2018 #6. You only need ventilation in a cold roof. It is universally recommended that cold deck flat roof construction should be avoided. Flat roof . Unvented roofs. Basically, the term “cold roof” refers to a traditional roof, or vented roof, while “hot roof” refers to a roof that is not ventilated and which has foam insulation attached directly to the roof sheathing. Cold Roofs. 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 … BMC2000 Active Member. An airtight ceiling will prevent a flow of potentially moist air into this space, and insulation will minimise heat losses. Followers 1. In traditional flat roof construction, it is prevented from penetrating the roof fabric from the building below through the use of a vapour control layer at ceiling level. The correct way to change a cold deck to warm deck. Ventilation is not needed in a warm roof. Warm roof - Designing Buildings Wiki - Share your construction industry knowledge. A great home requires a great roof. For this type of roof, you’ll need to have proper soffit vents, a ridge or gable vent, and ventilation baffles. Cold roof areas usually include ‘vapour-open’ fibrous insulation (e.g., mineral wool quilt); the sloping ceiling areas include closed-cell or foil-backed rigid board insulants, most of which are highly vapour-resistant. This keeps the structural deck “warm”. The Breakdown – Warm Roof vs Cold Roof. The layer of insulation is essentially placed outside of the roof. However, it must be pointed out that a cold roof requires more work and isn’t as thermally efficient as a warm one. Room in the roof constructions often use a combination of warm and cold roof constructions, with varying types of insulation. Is there the telltale sign of damp creeping across your ceiling? It can even affect your immune system, which is bad news for everyone. Figure 1 Cold roof construction. In the winter condensation forms on the ceiling and sometimes causes a dripping into the room. The benefits of roof ventilation technologies in warm climates are likely the main selling point of these kinds of products in Australia, where we have a dry, warm climate most of the year. Warm deck roof: The insulation in a warm deck roof is installed immediately below the roof membrane on top of the roof deck, usually with a vapour control layer underneath the insulation. A roof is mainly considered to keep out rain and snow from a building. This means that the insulation is on the outside of the building envelope and the roof structure and ceiling space are at a similar temperature to the building interior. The design of cold roofs usually occurs when external abutment height provision is problematic, thus making a warm roof not achievable. The main advantages are air tightness, speed of installation and simplified roof detailing. Zinc warm vs cold (unvented vs vented) By GraemeHM, 1 hour ago in Flat Roofs. Warm roofs are designed to keep the entire roof structure warm. zinc; low-pitch; warm roof; cold roof; Recommended Posts. It is obvious that this cold roof space should be decoupled from the internal, conditioned building space. Block existing ventilation throughout 2. Ventilated cold roof or warm roof with insulation boards atop sheathing which serves to raise the dew point above the structural members of the roof. Instead, the attic has insulation on the floor that separates air between the conditioned and attic spaces. In this way the roof itself is kept cold. There are three recognised designs of flat roof construction; warm, cold and inverted. Warm roof construction is where rigid board insulation is placed over the roof deck and the waterproof membrane is laid over the insulation (see Figure 2). It can also prevent pest from entering . Sika’s experience would be to avoid cold roof design where possible. This 'more or less head height' thing is misleading. Part of the successful design of a flat roof is in preventing such a condition from occurring. Notch7, 6 Dec 2019 #22. This traditional roof construction uses movement of air through the roof void to prevent the occurrence of harmful condensation. In these days of energy preservation, a roof can also contribute to preventing warmth being lost from a building. Cold roofing prevents the formation of ice dams, which can be a regular hazard with warm roofs. Cold Pitched Roof - Ventilated. Unlike cold roofs, the insulation in warm roofs is installed on top of the existing roof surface rather than in between the rafters. Leofric. What’s more, a warm roof allows heat to be conserved within a property without a ventilation system needing to be installed. Therefore, you won’t have to rip up the surface. There are pros and cons to both a warm roof and a cold roof. Well, first of all, damp can be very detrimental to your health. Void is ventilated. No insulation is on top. This video shows the key features of a flat roof cold deck construction and how to draw the details to a scale of 1:10 On the face of it, it might seem like an odd comparison, but there is a choice to be made between a cold roof and a warm roof, and this article will look into the reasons to consider each option for Zinc Roofing. It is important that the undertile lining drape does not touch the insulation and a minimum 25mm unobstructed ventilation gap is maintained at this point. Cold roofs are generally considered as difficult to design and construct and future upgrading of insulation requires invasive destructive means which should be kept in mind. I want to convert to warm roof by removing existing roof covering to ply deck, fitting vapour barrier, insulation and then new felt system. Warm Roof. This system is called warm deck insulation and eradicates the condensation and venting issues associated with the cold deck system. Roof Construction . Now there is a better form of insulation available for your flat roof. The area below the insulation will be as warm … On flat roofs, a 'warm roof' is one in which the insulation layer is laid on top of roof structure. Warm to cold roof is not a minor change, it shoukd have been referred back to architect. Warm Deck Insulation. Cold Roof vs Warm Roof. Where a cold flat roof does incorporate insulation this is in the form of mineral wool stuffed in between the timber rafters/joists, with a minimum 50mm (2 inch) air gap left clear in between the insulation and the roof deck. Rigid type insulation just above the ceiling, 3-4” gap and then plywood decking on top. Cold roof. Continue reading → Ice dams are formed when snow melts on the roof and then refreezes on the roof overhang. A cold roof is where all of the insulation is placed either between and under or completely under the joists or deck. 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