Pitched roofs can be insulated between, below or above the rafters. © 2021 Knauf Insulation. Outstanding noise insulation, thanks to a fibrous … There may also be a risk of ‘thermal bridging’ (cold spots) along the uninsulated rafters themselves but other approaches are sometimes limited. However, if the roof is not ventilated then it will require a breathable membrane between the insulation and structure. Mineral wool offers the best all-round thermal, fire and acoustic performance when compared to rigid foam boards to insulate between rafters. Permeable insulation often works well with old buildings, though non-breathable forms should not be discounted where adequate ventilation and detailing can be achieved. A flat roof has three types to choose from and they are; warm deck, cold deck or inverted roof. Insulation for Pitched Roofs at Rafter Level, Download our Pitched Roofs Rafter Level PDF. It will combat excessive heat loss and solar gain. where the ceiling follows the slope of a roof, regardless of pitch, or where a cold roof has a pitch less than 15°, ventilation equivalent to a 25mm slot running the full length of the eaves should be provided (a nominal clearance of 50mm should be maintained between the insulation and the roof … The use of sprayed foam or loose-fill insulation is inadvisable. Ballytherm insulation may be used to form warm pitched roofs when applied between and below the rafters. This is the installation of thermal insulation at the level of rafters – the inclined timber members that form the top of the frame supporting a pitched roof. Tap to unmute. A cold pitched roof is where the insulation is placed either ‘between’ or ‘between and under’ the rafters or at ceiling joist level. This question is for testing whether or not you are a human visitor and to prevent automated spam submissions. It is the most thermally efficient way of … There will also be Kooltherm K7 Pitched Roof board between the rafters (Image credit: Kingspan) With a warm roof the usual process is to split the insulation into two layers. Shopping. Insulating the slopes of roofs can be trickier than laying insulation conventionally over a horizontal ceiling in a loft but may be required should living accommodation be located directly under a pitched roof. This can be done either horizontally or vertically. As this requires fitting insulation above the rafters the roof covering will have to be removed in order to fit the insulation. The drawback is a loss of headroom internally. It is possible to apply the insulation to a ceiling but future removal may result in extensive damage. To create a warm pitched roof, insulation such as Kingspan Kooltherm K7 Pitched Roof Board, should be fitted between and over the rafters. If you live in an old building you may find that your roofing underlay is sarking felt, if so, you will need to allow for a 50 mm area of ventilation between … All rights reserved. ISOVER glass mineral wool (GMW) is another option for the between-rafter insulation as a roll or batt. Insulation under rafters is placed between battens. Here, the thermal insulation is precisely installed between the rafters. Non-combustible insulation will be required for any fire separation. Mineral wool offers the best all-round thermal, fire and acoustic performance when compared to rigid foam boards to insulate between rafters. Insulating a pitched roof space - a guide to insulation inside a pitched roof Menu ↓ ... Sheet insulation fitted between the rafters - the thicker the better but the size of rafter may limit the thickness possible once an allowance has been made for the required 50mm (2 inch) air gap. Ensuring that insulation is fitted tightly. Note: This article explains how to insulate a pitched roof structure with min. ... 5 thermal insulation layer between the rafters 6 thermal insulation layer under the rafters 7 vapor barrier 8 framing substructure 9 interior lining . Getting to Know… Kingspan Kooltherm K7 Pitched Roof Board. They are a universal product suitable for insulating pitched roofs , floors, walls,. The flexible nature of GMW means that the roll or batts can be accurately-cut and friction-fitted between the rafters – thereby minimising air gaps and maximising thermal performance. Privacy & Cookie Policy            Site Map            Photography credits. Between Rafters. What is the Difference Between Insulating a Roof or a Loft? The advantage of insulating beneath rafters where there is sufficient access is that the thermal efficiency of a roof can be improved from inside without stripping and re-covering it. Note: Rafter sizes assumed to be 38mm wide at 600mm centres (6.3% bridging) 10mm deeper than the insulation to account for the draped membrane. Superglass provides solutions for application between rafters, which provides thermal, fire and sound protection. Third Party Approved breather membranes should be used and ventilation is normally provided through ridge vents. When installed, they also provide high levels of acoustic and fire protection. Soft, pliable insulation, including hemp, can be appropriate. Note: Rafter sizes assumed to be 38mm wide at 600mm centres (6.3% bridging) and the same depth as the insulation. Our insulation solutions for warm roofs maximise both space and thermal efficiency, whilst also  contributing to acoustic performance. There is also a risk of condensation occuring if rigid foam is not correctly installed. Download our Solutions Guide Download our Pitched Roofs Rafter … Ideally, an additional insulation layer of ISOLAIR or PAVATHERM-PLUS is to be laid above the rafters as a sarking to reduce thermal bridging in the rafter area. Did you not find what you were looking for? Yes – installing rolls or slabs of insulation between the roof rafters is a popular way of enhancing thermal performance in habitable pitched roof spaces. When you use solid insulation board to create a warm loft the key thing to remember is ventilation – you must keep a 50mm gap between the roof and the rigid insulation board. Under the rafter insulation is often a few centimetres of insulation, in addition to the insulation that is placed between the rafters. Assess the roof structure and find the appropriate insulating method for you ( above, between , under the rafters or a combination of these) before you start . When applying horizontally, we recommended starting at the bottom of the roof and working upwards, ensuring to overlap the layers at each join. Why not take a look at our FAQs? A major factor influencing the design of pitched roofs with insulation at ceiling level, is the type of roof tile underlay chosen. Knauf Insulated plasterboard comprised of 9.5mm of plaster board at λ=0.19 where the remainder is the thickness of the thermallaminate. Pitched roof in-rafter installation The in-rafter installation variant consists in mounting the Thermano panels between the rafters. It can be advantageous to combine more than one of these approaches – for example, by insulating between and below rafters. Watch later. Pitched roofs can be insulated between, below or above the rafters. Share. Whichever approach you use, you will need a specialist professional to insulate your roof – this is not a DIY job. Mineral wool friction fits between rafters, providing an optimum seal and preventing gaps associated with rigid foam boards, which can otherwise lead to unwanted heat loss. The performance of products and methods of fixing vary. The roof will typically be insulated above the rafter line – creating what is most commonly known as a warm roof. When specifying, confirm with the product manufacturer their installation methods and expected performance. Mineral wool friction fits between rafters, providing an optimum seal and preventing gaps associated with rigid foam boards, which can otherwise lead to unwanted heat loss. Insulation is friction-fitted between rafters, with the option to underline the rafters with a layer of thermal laminate to further enhance thermal performance. The use of sprayed foam or loose-fill insulation is inadvisable. pitched roof constructions Insulation Over/Over And Between Rafters Tiles, battens, and ventilated counterbatten void Breather membrane Recticel Eurothane GP over rafters, stainless steel fixings, 6.7 per m2 50mm wide timber rafters, depth and centres as indicated Recticel Eurothane GP between rafters, as indicated Low-emissivity clear cavity, unvented Plasterboard finish Insulation … Insulating Between & Under Rafters | Loft Conversion Project 4.0 - YouTube. Where thermal upgrading is necessary under building regulations, important exemptions and special considerations exist for historic buildings that enable lower levels of insulation where full compliance would cause unreasonable harm. 45° slope, no ventilation gap above insulation and breather membrane underneath roof covering (slates). Download our Solutions Guide    Download our Pitched Roofs Rafter Level PDF. 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