No ventilation is required for these types of roofs. A warm roof construction allows heat to be conserved within a property – without the need for a ventilation system. © R&D Roofing Ltd 2019. stream Step One - Primary waterproofing layer. We'll assume you're ok with this, but you can opt-out if you wish. A vapour barrier will then need to be installed to reduce condensation in the roof structure. 3 0 obj Walkways. For a pitch lower than 14º the joints must be taped, between 14º - 22° there must be an overlap of 200mm, just steeper than 22° or unless it changes above 40º there must be an overlap of 150mm. Mechanical Attachment. %PDF-1.7 For additional stability, you can also use steel joists that are built into one or both of the walls. I don’t want to remove part of the ceiling and work from below, as the room is in use as our kitchen-dining room, and also sealing with expanding foam is more difficult working from below. So if I make the new roof a warm roof, insulation behind the fascia is straightforward, if fiddly, I “just” need to persuade the roofer to close and insulate the gaps between joists by taking off the old fascia and inserting pieces of rigid insulation between joists and use expanding foam to seal the insulation to the joists, roof board and wall (including the ceiling plasterboard to the thickness of the IWI in the room below). PDF DWG. Valley detail. 3. The insulation is immediately below the waterproofing layer. Part L of the Building Regulations states that the thermal efficiency of a refurbished roof be brought up to current standard if it doesn’t meet a minimum thermal performance. You can find a link to the building regulations document here. This website uses cookies to improve your experience. Presumably these also should be insulated in the same manner, as otherwise they form a classic cold bridge in a ring all around two sides of the roof. Due to the insulation being over the top of the roof, the timber structure beneath is warm, which is why the term ‘Warm Roof’ is formed. This usually keeps the deck ‘WARM’. WARM ROOF This type of construction has the insulation above the roof deck, thus keeping the deck ‘WARM’. Intensive roof construction is largely the same but may involve additional elements. A warm flat roof is formed by placing a layer of insulation over the top of the roof structure. This makes new conservatory roofs even more affordable. Vapour Control Layers. The Roof Lantern Upstand in Detail; Darren Collins | 4th September 2017. Temperature Control. VMZ-SN-CO-KN-b1-mansard. PDF DWG. It is the most acceptable type of construction for domestic possessions and belongings, as it avoids the need for aeration of the roof construction. If you do not abide by the current building regulations, then you will not receive a building regulations compliance certificate which could affect the sale of your house should you wish to sell it. Part 3 – Pitched Roof Detail: covers pitched roof detail: roof ridges and ridge tiles, roof hips and hip tiles, roof valleys, roof verges and lead flashings. The membrane is then attached to the insulation. You need to agree with the terms to proceed, 15 Yew Tree Road, Hayling Island, PO11 0QE. And finally fit new roof board to close the remaining strip of removed board. VMZ-SN-CO-RAA-b2-skylight. A lot of fiddly work, SO DO YOU HAVE ANY ALTERNATIVE IDEAS? We provide our high quality service to domestic and commercial customers. Warm Deck – this is where the insulation is placed on top of the rafters/joists and the roof covering is then placed over the insulation. PDF DWG. Here, insulation is installed at rafter level, using rigid and/or semi-rigid insulation. Steve from London Flat Roofing explains how warm flat roof construction works in this excellent short video: When 50% or more of the roof’s waterproofing layer is removed and replaced this is called refurbishment. <> Steve from London Flat Roofing explains how warm flat roof construction works in this excellent short video: In an earlier video you showed how to seal and insulate behind the fascia of a warm roof, so that you avoid condensation on the fascia, and even more importantly avoid cold air circulating between a warm roof and the ceiling below, which can completely defeat the aim of a warm roof. Our replacement roofs are so energy efficient that they can reduce heating bills. Designed for the trade - Open to the public. Voir plus d'idées sur le thème architecture, detail architecture, façade détail. Therefore water vapour which enters the roof structure from the room below will not have a cold surface on which to condense. Save my name, email, and website in this browser for the next time I comment. Structural roof - warm construction; Verge abutment of a wall. In new flat roofs it’s becoming more and more common to undergo warm flat roof construction to abide by building regulations and save lots of money on your insulation costs. Warm roof systems benefit from the insulation sitting above the deck. - Earn over 80% - Upload any CAD models including; - 3ds max , AutoCAD , Rhino , Vector works , Sketchup , Revit and more; Upload Part 1 – A Guide To Roof Construction: covers an overview of flat and pitched roofs. May 18, 2016 - Buildbase is one of the UK's fastest growing builders merchants with branches nationwide. A hybrid system comprising 120mm of IKO enertherm ALU insulation above the roof deck and VCL, and 100mm of the same product below will provide a U-value of around 0.11 W/m²K. The Benefits of a Warmer Roof 2-3 Day Installation Time. As climate change research continued, Part L was further reviewed for England and Wales, to take effect from April 2006. All Rights Reserved. VMZ-SN-CO-NO-b2-wall-abutment. See also: Part 2 – Pitched Roof Construction: covers pitched roof materials, basic pitched roof designs, cold and warm pitched roofs and pitched roof construction. The object being to design out the possibility of warm moisture laden air coming into contact with a cold surface and condensing. Sorry, I mean hi Danny, in the video by Steve of London Roofing, he shows…, Your email address will not be published. In a warm pitched roof construction the thermal Insulation is placed in the rafter line. However, advice should be sought if using profiled steel decks with a wider open area or “trough”. It is necessary to incorporate a vapour control layer beneath the insulation in order to prevent moisture vapour being forced into the insulation through thermal pressure from within the … Rooflights. PDF DWG. 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. Throughout the course of the year the roof deck and all below it is kept at a temperature close to that of the inside of the building, therefore the roof structure is protected from extremes of hot and cold, lessening the potential for damage caused by thermal movement. The insulation can be adhered, mechanically fixed or loose laid. To use EPDM for a warm deck flat roof construction, solid (closed cell) roof insulation such as Kingspan or Celotex should be placed on top of the roof deck, rather than in between the rafters. VMZ-SN-CO-ZIJ-b2-wall-abutment. R&D Roofing Contractors Ltd is a flat roof company who specialise in modern flat roofing systems. VMZ-SN-CO-NO-b1-ridge. Having a manual for warm flat roof construction with details and a summary of rules to follow helps. Ideally, the insulation is positioned in a continuous layer above the rafters, so that the roof structure is in a ‘warm’ environment. Purpose: The Accredited Construction Details document, which comprises of this section and five other parts, is produced to assist designers, verifiers and site operatives in the delivery of buildings which limit heat loss from linear thermal bridging and uncontrolled infiltration.