If you are installing loft insulation as part of  a roof renovation project, where more than 25 per cent of the roof is being renewed, then the level of insulation should meet the standards required by building regulations Approved Documents. The Scottish Technical Handbook sets specific U-values based upon the particular building element (wall, floor or roof). If in doubt contact your Local Planning Authority. An uninsulated loft space would have a u-value in the region of 2.5 W/m2K, but in 1965 building regulations dictated that the maximum u-value for a loft should be 1.4 W/m2K – which could be achieved with just 2.8 cm of wool insulation!In 1973, the required u-value dropped to 0.6 – this required a 7cm thick layer of wool insulation – again not much compared to what is needed now!In 1985, the u-value dropped to 0.35, in 1990 it dropped to 0.25 and in 2002 this dropped down to 0.2. However, if such an upgrade is not technically or functionally feasible, the element should be upgraded to the best standard which can be achieved within a simple payback of no greater than 15 years. Powered by Jadu. Roofing Insulation: A thermal layer of fibreglass, polystyrene or other insulating material should be inserted either above the roof decking (the ‘warm-roof’ model), which is suitable for homes or permanent residences; or else on the interior of the building just above the ceiling (a ‘cold-roof’), which is … No ventilation is required for these types of roofs. Walls are defined by Regulation 2 (3) of the Building Regulations 2010 as being thermal elements. Advertisement These are expressed as a U-value which needs to be achieved. In the case where the insulation is placed between the rafters then vents should also be placed along the ridge. Department for Communities and Local Government. Advertisement With summer approaching and temperatures rising, now would be the perfect time to consider adding some insulation to your roof which is a part of the construction under the direct influence of the weather conditions, read steaming sun rays that can be ruthless when the summer season is at its peak. .defineSizeMapping(mapping) A warm roof has the insulation placed entirely above the roof deck so that the roof deck shares the internal temperature of the building. Use our partner directories from RIBA, FMB, or RTPI to find an architect, builder or planning consultant to help with your project or development. This is an introductory guide and is not a definitive source of legal information. To comply with Part L of the building regulations 2010, all roofs to rooms (except those in unheated buildings) should be thermally insulated to a maximum U-value of of 0.18 W/m²K. If you are installing loft insulation as part of a roof renovation project, where more than 25 per cent of the roof is being renewed, then the level of insulation should meet the standards required by building regulations Approved Documents. I think up to 150mm is easy to get in, beyond that probably more modifications to get everything to fit together. The thickness of insulation in both cases will vary depending on the material you use and manufacturer’s specification. U value of a flat roof. Heat rises, and therefore the Building Regulations requirements for heat loss through roofs are more stringent than those for walls. A low U-value usually indicates high levels of insulation. In 2006, the UK adopted new Building Regulations (parts L1 and L2) which are enforced in the building industry. Regulation, Ventilation and Insulation of Pitched Roofs. Cold Deck – The thickness of insulation required will vary depending on the material you decide to use and the manufacturer’s specification. This is placed over the roof joists and an board (normally external ply) is laid on top. ‘A’ applies where the walls of the existing building have a U-value better than 0.70 and the roof better than 0.25, or will be upgraded to those levels as part of the works ; The higher standards in ‘B’ apply where the walls of the existing building have a U-value poorer than 0.70 and the roof is poorer than 0.25. In England and Wales, account should be taken of Accredited Construction Details. This guidance relates to the planning regime for England. Roof insulation should be placed above and around water tanks, but not below them ‘Cold rising’ pipework above ceiling level should be insulated, even where it is below the main roof insulation. Building Regulations: Current U-values for Insulation in Homes October 12, 2020 by Jon Davies 1 Comment As there are a number of figures thrown around, relating to U-values in new homes or extensions it is worth a reminded of some of the figures used in current Building Regulations. Making significant changes to thermal elements (walls, roofs or floors) would normally require Building Regulations approval and require the thermal insulation of the element to be upgraded to a reasonable standard. PortalPlanQuest is a joint venture between TerraQuest and the Department for Communities and Local Government. googletag.display('div-gpt-ad-1476980578610-0'); resist the spread of fire from one property to another. googletag.pubads().setTargeting("H2:1", document.getElementsByTagName("h2")[0].innerHTML); The thickness of insulation will vary depending on the manufacturer’s specification. PortalPlanQuest is a joint venture between TerraQuest and the Department for Communities and Local Government. This website uses cookies to improve your experience while you navigate through the website. Roof: some sort of shingles on battens, factory spec has this panelled underneath but it's common to find space for insulation, with a slight re-jig to the design. How to Insulate a Roof addSize([0, 0], []). (Thickness varies according to the manufacturer’s specifications). Additionally, if the span is greater than 10m the overall ventilation area should be increased to at least 0.6% of the total roof area. Building regulations approval is required for most building work in the UK. Ventilation is required for these roofs. Handcrafted by Spacecraft. Care should be taken not to block any ventilation at the edges (eaves). Handcrafted by Spacecraft. googletag.pubads().setTargeting("Language", window.location.pathname.split( '/' )[1]); The age of your house is a fairly reliable indicator of its likely thermal efficiency especially if no upgrades have been made to the fabric of the building – although many houses have been extended or otherwise significantly modified over the years. The installation of insulation in your loft must meet the minimum energy efficiency values set out in the Approved Documents. Some repairs to flats roofs will not require an application for approval under the Building Regulations. If in doubt contact your Local Planning Authority. Warm Deck – The insulation is placed over the rafters and then a felt is placed on top. Basically each element of the garage conversion; walls, floor and roof, will have to be constructed and insulated so that its U-value (rate of heat loss through that element) meets or is less than the value stated by Building Regulations/Standards. Powered by Jadu. The battening and tiling is then fixed down over. A vapour membrane should be added to the underside of the insulation and tacked to the joists before applying the plasterboard. Ventilators About Planning Portal adverts. googletag.enableServices(); Building regulations: roof 1. About Planning Portal adverts. Therefore the less heatloss. About Planning Portal adverts. **Air paths should not be obstructed. Policy in Wales may differ. In the case where the insulation is placed between the rafters then vents should also be placed along the ridge. Cold Deck – this is where the insulation is placed between the joists/rafters or in between the ceiling joists in the case of a pitch roof. A ventilation gap, usually 50mm, should be provided between the top of the insulation and underside of the roof covering to allow the air to flow across. Part L of the Building Regulations for England and Wales (Conservation of fuel and power) and Section Six (energy) of the Scottish Standards set the levels of thermal insulation required when carrying out building work, either for new build or refurbishment projects. These regulations deal with the conservation of fuel and power, and with isolation. window.slot2 = googletag.defineSlot('/124048874/Double_MPU', [[300, 250], [300, 600]], 'div-gpt-ad-1476980578610-0') Policy in Wales may differ. EN . These U-values, applicable to an extension of an existing building, are shown in the table below. Care should be taken not to block any ventilation at the edges (eaves). Find out more information on the Acoustic Building Regulations so your ROCKWOOL project meets acoustic regulations for building regs. However, if the roof with integral insulation is to be replaced then you may be required to upgrade this 'thermal element' of the structure and reduce the amount of heat that was originally lost, by upgrading the insulation. Care should be … About Planning Portal adverts. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. for an extension) will be required to: resist weather. Cold Deck – The insulation can be placed between the rafters or it can be placed between the ceiling joists. A minimum 50mm free air path should be maintained between the top of the insulation and the underside of the roof decking. They are useful as a way of predicting the composite behaviour of an entir… The roof covering is then laid over the ply. The effect on XPS insulation – roof upstands Where a flat roof meets an external wall, an upstand is required to help prevent the ingress of water to the building. A lower U-value indicates better insulation properties, hence U-value requirements usually specify a … The roof should have vents installed along the eaves to both front and rear or from side to side. googletag.cmd.push(function() { Building regulations: New Roofs - Weight (Loading), Building Regulations: Work to an existing roof, Building Regulations: Insulation and thermal elements, Building regulations: Conversion projects, Department for Communities and Local Government. All content © 2021 Planning Portal. The limiting U value (the maximise U value which cannot be exceeded) required under current Building Regulations for the roof is 0.20W/m². The lower the U-Value the more insulation there is in a building element, (e.g a floor, ceiling or wall). Installing flat roof insulation could save you similar amounts on your heating bills to loft insulation. This means that the higher the U-value the worse the thermal performance of the building envelope. The actual regulations require that loft insulation should be at least 270 mm thick and must have good thermal properties. Building regulations Roof insulation thickness for building regulations will vary depending on the type of insulation used. The simple answer is Yes! Building Regulations, Standards and U-Values. In a warm deck roof the insulation is positioned above the structural deck and no ventilation is required. Posted in Building Regulations for Conservatory Roofs. A new roof (e.g. About Building Regulations. 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. Ventilation is required for these roofs. Pitch Roof Any significant alteration or replacement that reduces the glazed area of the roof requires Building … var mapping = googletag.sizeMapping(). Building Regulations for Insulating a Roof. This is an introductory guide and is not a definitive source of legal information. In order to satisfactorily fulfil this function over a period of years it must be strong, stable and durable. Use our partner directories from RIBA, FMB, or RTPI to find an architect, builder or planning consultant to help with your project or development. Consequently, the higher the U-Value, the more heatloss you have in the home. Building regulations in the United Kingdom are statutory instruments or statutory regulations that seek to ensure that the policies set out in the relevant legislation are carried out. be able to support loads (weights) provide resistance to heat loss (insulation) be ventilated to protect from condensation (in … Ventilation openings (either at the eaves or upstand). If your flat roof needs to be replaced anyway, you must now insulate it to comply with building regulations. .build(); Works to an existing roof If you want to carry out repairs on or re-cover less than 25 per cent of the area of a pitch or flat roof, you will not normally need to submit a building regulations application. The function of a roof is to protect the building below from the weather. googletag.pubads().setTargeting("H1", document.getElementsByTagName("h1")[0].innerHTML); 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. In addition, roofs must provide good thermal insulation and prevent the spread of fire from adjacent or adjoining properties. A cold deck roof is where the insulation is placed between the joists/rafters or in between the ceiling joists in the case of a pitch roof. Importantly, no other insulation elements will be required, such as Kingspan or Celotex. All content © 2021 Planning Portal. addSize([450, 200], [[300, 250], [300, 600]]) The roof should have vents installed along the eaves to both front and rear or from side to side. A U-value is a measure of heat loss in a building element such as a wall, floor or roof. Warm flat roof designs include “inverted roofs”, where the waterproof membrane is positioned below the insulation and roof gardens or balcony terraces. To limit the cold bridging effect of the junction, the upstand should also be insulated, and Polyfoam XPS … K. When specifying the insulation for the pitched roof it is important that the thickness of insulation used achieves the required U-value. .addService(googletag.pubads()); }); Used within a Bauder waterproofing system our products meet current UK Building Regulations Part B for fire protection. 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