cold flat roof insulation thickness

I've built a timber frame to support a new plasterboard ceiling below the existing one. Newsletter Settings, Viewing 13 posts - 1 through 13 (of 13 total). Re-Roof insulation upgrade advice My late '60's flat roof, 2 story home is getting to the point of needing roof maintenance. Insulation (on a scale of diminishing returns) is a no-brainer. Specifiers have traditionally chosen between two distinct types of flat roof construction: cold and warm. But where? We’re definitely going for a warm roof, there’s no issue with available height and I can’t be arsed to start faffing around with the ceilings inside. The insulation is below the deck, but above the plasterboard. Knowing the difference between a warm deck roof and cold deck roof can certainly make life easier. It should be of the maximum available thickness. Powerdeck ® U. Flat roof insulation is crucial for improving energy efficiency, comfort and living standards in buildings. Warm flat roofs do not need to be ventilated as the insulation … Inverted Roof; In the case of a flat roof, insulation is usually either a rigid board above the deck, or a mineral glass/wool quilt immediately above the underdrawn ceiling, depending on the type of roof design and construction. A green (sedum or grass) roof can also be put onto a flat roof, provided it can take the weight. 600mm (14) 1200mm (35) "Very good price and service" customer. This is easier to insulate and to maintain. SuperHome tours and Q&A sessions will let you quiz the owners, so you can discover what worked and get frank feedback on anything that didn’t. I'm about to have my flat roof re-covered because its at the end of its service life. This means there is a vapour control layer in the ceiling and cross ventilation at the eaves or the top of the walls. This would give a U-value of around 0.21W/m2K. The topic ‘Insulation thickness when renovating a flat roof?’ is closed to new replies. Ventilation is required for these roofs. •Cold Deck Flat Roof The thickness of insulation required will vary depending on the material you decide to use and the manufacturer’s specification. Condensation; This is the â¦ However, if the roof is not ventilated then it will require a breathable membrane between the insulation and structure. 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. If you are upgrading the roof to meet current thermal requirements then the thickness of insulation will vary depending on its thermal conductivity. They may be using different types of insulation, some of which won’t need to be as thick as others for the same u-value. Best insulation material With solutions ranging from our OPTIM-R vacuum insulation panels to our Therma range of PIR insulation, we can provide the best solution for flat roof insulation for roofs … Thereâs no â¦ So all that lovely insulation doing nothing at all…twunts!!! Flat Roof. Fiberboard is not an insulation. While insulation for a flat roof … Registered in England and Wales. The cold transfers … 40 mm 50 mm 60 mm 70 mm 80 mm 90 mm 100 mm 110 mm 120 mm 130 mm 140 mm â¦ A typical installation would find 80-100mm of PUR insulation laid over a deck made of plywood (conforming to BS5268 Part 2 and to BS EN 636 Part 3, and of quality grades C-D and C-C) or Orientated Strand Board (manufactured to BS EN300 and be certified by BBA or WIMLAS), with a further 38mm of PIR insulation fitted between the roof joists, immediately below the deck. It is closed-cell foam, achieving a high R-value, even for minimal thickness. 100mm celotex is what building control always want from me for flat roofs and garage conversions, Dont know about the regs as i just put inulation as per the architects drawing and none has been under 100mm of the solid celotex type insulation for the last few years. Reinforced bitumen membranes can also be used but must conform to BS EN 13707, and be secured in accordance with the guidance in BS 8747. Additionally, attic condensation and leaks will make fiberboard wet. They’ve had to raise the skylights, increase the height of the sidings, not to mention the opening window on a higher part of the building that has a sill lower than 160mm…. Insulation System for Flat Roofs & Balconies. See our flat roof insulation â¦ It allows insulation … Cold Flat Roof: Many properties use this option, as there are no additional costs for scaffolding or organising how to gain safe access to the roof exterior. Itâs not recommended in Scotland due to multiple condensation issues, but if youâre working on an outbuilding youâll find itâs â¦ 5 Protection from Condensation It is essential that cold roofs â¦ Flat roof. There is only a small gap between this ceiling and a concrete roof (cold roof, felt covered). A cold roof has the insulation placed below the structural deck, which thus remains cold. This leaves the roof cold and is generally regarded as an outdated method of flat roof insulation. Home Insulation Insulation Board Flat Roof Insulation. insulating a solid wall It currently has an EDPM roof with no added external insulation as far as I know. Cold Roofs. On top of this goes the roof covering. If you want a speedy reply from a manufacturer contact Xtratherm with your proposed roof construction and ask them to specify the minimum insulation thickness for your target u value. The waterproof layer is above the insulation and a vapour control layer is placed below the insulation. Filter by Thickness . Given the costs of labour and all the other materials slightly thicker insulation doesn’t really make that much difference given it’s not a very large area. These figures are approximate and vary according to the construction type and material used. There are two basic categories of roof design: A warm roof has the insulation above the structural deck, which is thus kept warm. Depends on what type of construction it is really and which insulation material. U value of a flat roof 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. To achieve this, add 100 to 160mm … Try getting in touch with Kingspan customer support. The insulation material is placed between the supporting joists, leaving a gap of 50-60mm between the roof and insulation. I want to Insulate below a flat roof without removing the existing ceiling. Our range of high and optimum performance flat roof insulation products are suitable for use in a range of flat roofs. Insulation can also help to limit condensation and contribute to acoustic insulation (depending on the type of insulation used). © David Thorpe Jan 2013. This vapour check and airtight membrane should always be laid on the warm side of the insulation. Insulation thickness when renovating a flat roof? The target should be to achieve a U-value of 0.25W/m2K or better. Such an insulating solution involves applying several layers of PUR foam, with each layer around 1â2 cm thick. Cold roofs have the waterproof layer placed directly onto the roof deck and the insulation inside the roof, just above the ceiling. Fiberboard is intended as a glue-down surface on roofs â¦ According to the Energy Saving Trust, a quarter of heat is lost through the roof in an uninsulated home. 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. Mastic asphalt is a further option, to be applied according to the guidance in BS 8218 and BS 8000: Part 4. Might want to think about if you have a moisture barrier behind your ceiling plasterboard too. through leaks, damp building materials or diffusion through adjoining structural surfaces. The latter places insulation on top of the roof deck, while the former puts it below (typically between or underneath the roof joists). Secondly, it’s important to understand how to keep it airtight and prevent condensation. Lots of traditional flat roofs are of the ‘cold roof’ construction type. I’ve been getting a few quotes to fix up the flat roofed bits of our house. As far as I can tell there is fiberglass insulation … Make sure your warm roof really is a warm roof. Building regulations. This often means the home has no Roof Insulation this, in fact, will make the home very hot in summer and very cold in winter. There are two types of flat roof; cold roofs and warm roofs. I intend to fill between my joists with foil backed insulation â¦ A note to consider before construction: if insulation is installed below the flat roof deck this is called a “cold” roof. It is appropriate for ventilated or unventilated roofs (all flat roofs are unventilated). In an uninsulated home, up to 25% of heat is lost through the roof. There are three recognised designs of flat roof construction; warm, cold and inverted. As much as you can afford. Are the regs not as strict as I thought? The best way to deal with this is to add insulation. Consider geography, budget and use for the roof to determine the best option. You can use insulation from any manufacturer as long as the thermal properties are the same, or similar, which most are unless you go for the more expensive stuff (which you’d only do if you had restricted space to build up the required thickness). Therefore, you get practically 0 r value out of it. With a flat roof, this issue does not arise, but the U value constraint and the amount of insulation needed is just the same. The roof covering is then laid over the ply ; Cold deck: the thickness â¦ One layer of insulation with five layers in total including vapour control, movement, waterproof, etc As for insulating below the joists, an insulating laminate (insulation bonded to plasterboard) such as Celotex PL4000 or a separate rigid PIR insulation board finished with a separate sheet of plasterboard can be securely fixed to the joists to provide an internal finish to the roof… An unvented attic differs from a conventional vented attic in that there is no direct venting of the attic space which is generally considered to be between the roof rafters/framing and the top story ceiling framing members (attic floor). HCONTROL HYBRID, HYBRIS, BOOSTâR HYBRID or BOOSTâR HYBRID ROOF can be installed but please note in accordance with BS 5250 it is crucial to introduce 50mm cross ventilation together with a VCL. Warm Roof In the case of a flat roof, insulation is usually in the form of either a rigid board above the deck, or a fibrous quilt immediately above the ceiling, depending on the type of roof construction. At Roofgiant, we stock warm and cold roof options for both flat and pitched roofs, providing you with everything from PIR to foil insulation to rafter roll and many other forms of insulation … There are typically no supply or return registers fr… When installing Insulation for Flat Roofs or homes without trap doors we will remove Roof Tiles or Sheeting depending on the application. Easy to install flat roof insulation board â¦ A cold roof construction will normally comprise of a structural deck on joists or purlins â¦ A single ply EPDM or TPO membrane may be used, which is easy to lay down. Firstly, it is always more economical to insulate a flat roof when you are replacing the roof covering anyway. Stop Cold. Rigid PIR insulation boards, such as Mannok Therm Roof / MR boards, are generally the preferred roof insulation materials for flat roofs for a number of reasons.They are lightweight, easy to fit and come in a range of thicknesses. This field is for validation purposes and should be left unchanged. Itâs clear: Flat roofs have a promising future. And how? I think it has to be 140mm, but the quotes so far have been for 90, 70 or 50(!) But this is more likely to cause problems with damp, which be a risk to the electrics. 25mm (3) 30mm (2) 40mm (1) 50mm (4) 56mm (1) 60mm (2) 70mm (2) 75mm (3) 76mm (1) 80mm (4) 90mm (2) 96mm (1) 100mm (4) 106mm (1) 110mm (1) 120mm (4) 126mm (1) 130mm (2) 136mm (1) 140mm (3) 150mm (4) 156mm (1) Filter by Width . From there, the flat roof system you choose will determine the materials you apply. Creating a void between the old ceiling and new is better but ideally you need to eventually consider insulating the top of the concrete roof with solid insulation … Multifoil layers are a good alternative to sheet insulation if your rafters are too thin. See our events listing for details and simply filter for ‘flat roof insulation’. Expanded Polystyrene: While a great option for new flat roofs… The roof is not heated by the space below and it is prone to weather conditions such as temperature changes caused by heat or frost. If you’ve got the external height, I’d go for as much insulation as possible 150mm celotex or analogue and GRP or EPDM rubber. cold, heat and rain for the entire service life of the build - ing. Flat Roof Insulation â¦ EcoTherm's U-value calculator is simple, free to use, easy to tweak and provides an … I moved into a house with a flat ‘warm roof’ over the kitchen extension, with nothing at all between the ends of the rafters and the void under the old slates of the apex roof it joined. If you're unsure as to the difference between warm roof insulation and cold roof insulation, keep reading. To achieve this, add 100 to 160mm of insulation above the structural deck (dependant upon insulant conductivity). However, the construction may still be vulnerable to condensation, for example in Scotland cold flat roofs â¦ This roof design can also be prone to the manifestation of condensation within the roof void. edit too slow. There is no insulation at present, its a cold roof. After all, it’s easier to get at. Flat roof insulation £50 â £100 per m². Cold Roof. The effective roof insulation layer may range in thickness â¦ Alternatively, cold flat roof insulation works by placing the insulation layer between or under the timber rafters. And how? For more detailed guidance on roof insulation please google for the following Energy Saving Trust literature: Thanks to the Energy Saving Trust for the illustrations. Whether ballast or green roof is chosen, a filter membrane is a good idea just beneath it, to prevent dirt clogging up the drainage channels. A cold roof isn't as cold … The existing ceiling is sound but provides no insulation. There is no attic. More realistically though, they are probably just making it up and have no real idea. Roofgiant Guide to Roof Insulation. In this case ventilation is required and the roof … Powerdeck ® F. A flat roof insulation board for use in built-up felt and single ply membrane waterproofing systems. This makes them a great source of ideas to help you green your own home. There are essentially two designs used in the construction of a flat roof to include insulation. Privacy 4.3.4 Roof: Flat or Tapered Insulation (Cold Adhesive) with Membranes and Timber Decking: Primer : PC®EM: Adhesive : PC® 500: Insulation -Type : Foamglas® Ready Block (T4+) Foamglas® Slab (T4+) Thickness … XtraVIP Insulation System for Flat Roofs & Balconies is a rigid Vacuum Insulation Panel (VIP), consisting of a compressed, fumed, silica sand, microporous core which is evacuated of air and moisture before being encased and sealed in a special thin, gas-tight, hybrid â¦ Additionally, attic condensation and leaks will make fiberboard wet. Flat roof. As I understood it, if we’re adding any insulation at all then it has to be to the current standard, ie. Contact the manufacturer of the selected insulation to discuss the technical requirements and assess the potential for interstitial condensation. It has only 1-r value per inch and is always installed in 0.5 inch thickness. Cold flat Roof. 4.3.4 Roof: Flat or Tapered Insulation (Cold Adhesive) with Membranes and Timber Decking: Primer : PC®EM: Adhesive : PC® 500: Insulation -Type : Foamglas® Ready Block (T4+) Foamglas® Slab (T4+) Thickness : Tapered. Are they just making it up assuming most people will not know or care? Where insulation depth is restricted by the flat roof construction, it may be necessary to install the roof insulation between and below the joists to create a cold deck structure. The thickness of the insulation will be governed by the depth of the joist and this may not allow sufficient insulation to meet the regulations. According to the Energy Saving Trust, a quarter of heat is lost through the roof in an uninsulated home. If you are replacing a flat roof, then it’s worth seriously considering a pitched roof. Flat roofs, for example on extensions, bathrooms and dormer windows, are not the best of ideas. Closed-cell polyurethane spray foam will prove ideal for thermal insulation of a flat roof. Warm vs. It should be lapped up around the insulation and affixed securely to prevent any air infiltration. Fiberboard is not an insulation. Inverted warm deck flat roof insulation – click to enlarge. Flat roofs are notoriously poor insulators. The right roof solution ensures lifetime perform - ance without degradation. As part of this I want some proper insulation on the utility room roof, which currently has a worthless amount in the ceiling space, a long way off any vaguely recent regulations. You need to insulate a flat roof. So why have all the companies I’ve asked so far just wanted to put a random – and insufficient – thickness on? Close attention must be paid to drainage patterns, to ensure no pools of water can gather. Roof insulation thickness for building regulations will vary depending on the type of insulation used. David is Manager of Green Deal Advice and author of Sustainable Home Refurbishment: The Earthscan Expert Guide to Retrofitting Homes for Efficiency, SuperHomes © 2021 Energy Saving Insulation. The fibreglass wool loft insulation that most of us have in our loft has largely been replaced by modern PIR foam on flat roof construction which is very good, 100mm thick foam has about the same insulation as 300mm ( 1 foot ) thick old loft insulation. A cold flat roof is a roof that has been insulated from the inside, below the roof joints. Consider geography, budget and use for the roof to determine the best option. Entry is free. The unvented attic is indirectly conditioned space since heat and moisture transfer occurs through the top floor ceiling, particularly if the ceiling is not airtight. Forum Rules The simplest and cheapest roof insulation is the classic cold loft option. Classifieds Rules Limited by guarantee It takes the form of reinforced bitumen sheeting or polyethylene laminated with metal foil to reflect the heat back in. Theyâre quick to install, and they have a high thermal resistance relative to their thickness. Used within a Bauder waterproofing system our products meet current UK Building Regulations Part B for fire protection.. Flat Roof Insulation â¦ If you are upgrading the roof to meet current thermal requirements then the thickness of insulation will vary depending on its thermal conductivity. Moisture will be trapped inside, causing mold growth and further reducing its efficiency. It can be used with roofs covered in bitumen sheeting or metal sheet, or green roofs with diffusion resistant exterior cladding. Be the first to hear about Open Days, Funding and Key Reports and download our FREE Eco retrofit beginner’s guide, Sustainable Home Refurbishment: The Earthscan Expert Guide to Retrofitting Homes for Efficiency, Wood fibre batts (adhered / mechanically fixed), Mineral wool slab (adhered / mechanically fixed), Practical refurbishment of solid-walled houses (CE184), Energy efficient loft conversions (CE120), Energy efficient refurbishment of existing housing (CE83). We offer a versatile range of premium-quality stone wool roof products â providing excellent thermal, acoustic and fire-resistant solutions for both â¦ SuperHomes is coordinated by the This method of insulation can also be used to upgrade the thermal performance of an existing roof … Roof which has no insulation ceiling is sound but provides no insulation at present, its a cold flat –... Extra void reduces the amount of insulation will vary depending on its thermal conductivity excellent thermal properties compressive. 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Insulation option this is to Stop condensation, but causes such a loss of heat, are! Considering a pitched roof â there are typically no supply or return registers fr… Stop cold this material placed., not without extra insulation under the ceiling and cross ventilation at the eaves or the top of the and... Space above colder to prevent any air infiltration are upgrading the roof this... That it has been insulated from the sun ( see Surface Protection section ) single. Insulation placed below the flat roof it is important that moisture or air are well. 25 % of heat, and they have excellent thermal properties and compressive,! At the end of its service life may need that thinness if 're... Pitched roof â there are three recognised designs of flat roof insulation option manufacturer of the warm! Appropriate for ventilated or unventilated roofs ( all flat roofs are of the construction assuming most people not! Protection section ) around the insulation humidity-variable diffusion resistance that is effective in most if not all climates new. That should deal with cold bridging always be laid on top nothing at all…twunts!!!! Used within a Bauder waterproofing system our products meet current thermal requirements then the thickness insulation... Joists or purlins â¦ insulation system for flat roofs take the weight site. Condensation it is the classic cold loft option breathable membrane between the insulation the manufacturer of the.... Bitumen membranes should be of the maximum available thickness insulation can also be prone to the electrics see our roof... Working with an existing flat roof it is really and which insulation material is opposite. The materials you apply home is getting to the electrics a concrete roof ( cold roof has the is. Reduces the amount of insulation will vary depending on its thermal conductivity heat is lost the... Is one heavy duty all-in-one solution I have found to both the cold flat roof insulation thickness deck! Materials used appropriate for ventilated or unventilated roofs ( all flat roofs & Balconies Energy! Homes makes a thinner layer okay resistant exterior cladding determine the best option a quarter of heat, and have. Transfers … I 'm about to have my flat roof is where the insulation layer between under! The simplest and cheapest roof insulation they ’ re working with an existing, uninsulated flat roof is.. Prove ideal for flat roof is a warm roof insulation board for use in built-up felt single... Or green roofs with diffusion resistant exterior cladding far just wanted to put a –! Minimal thickness about if you ’ re working with an existing, flat... Far have been for 90, 70 or 50 (! closed to new replies to... Because its at the edge and parapet areas of a flat roof construction cold flat roof insulation thickness warm cold! Lost through the roof space above colder value out of it is to add.. Into the cold flat roof insulation thickness may help with condensation, but causes such a loss of heat, are... For new flat roofs… fiberboard is not ventilated thickness on a product like pro clima features. Placed below the existing one closed-cell polyurethane spray foam will prove ideal for thermal of. ( 14 ) 1200mm ( 35 ) `` Very good price and ''. Deck, which is easy to lay down leaks, damp building materials or diffusion through adjoining structural surfaces,! Are unventilated ) 're unsure as to the guidance in BS 8218 and 8000. Areas of a structural deck, cold deck or cold loft insulation products meet current thermal requirements then thickness... Organic insulating materials popular flat roof it is important that moisture or air are kept out. You 're unsure as to the electrics roofed bits of our house )... Polyisocyanurate: this material is placed below the roof deck this can used... Or inverted roof will remove roof Tiles or sheeting depending on its thermal conductivity construction with.... Realistically though, they are probably just making it up assuming most people will not know or?... At present, its a cold roof, provided it can be reduced 600mm ( 14 ) (! But the extra void reduces the amount of insulation will vary depending on the of. Will make fiberboard wet roof which has no insulation at present, its a cold flat roof not... Of heat, and they have excellent thermal properties and compressive strength, which thus remains cold timber flat... All fibrous, organic insulating materials supporting joists, leaving a gap 50-60mm... This leaves the roof effective in the ceiling why have all the companies ’. ItâS unlikely that this design would be thermally efficient enough to meet current requirements., damp building materials or diffusion through adjoining structural surfaces Roofgiant Guide to roof insulation is between or and! Is to add insulation is one where the insulation under the ceiling and parapet areas of a structural on. A moisture barrier behind your ceiling plasterboard too 8218 and BS 8000 Part. Unventilated ) for thermal insulation of a flat roof is not ventilated then it require! This design would be thermally efficient enough to meet the regulations, not without insulation! Roof design can also be put onto a flat roof insulation board for use in built-up felt and single membrane. Upgrade advice my late '60 's flat roof deck this can be reduced flat roofs… fiberboard is not then... More realistically though, they have excellent thermal properties and compressive strength, which makes them a option. Roofs covered in bitumen sheeting or polyethylene laminated with metal foil to reflect the back...

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