Pitched Roof Insulation
- Mineral wool slabs
- PIR rigid boards
- EPS & XPS polystyrene
- Phenolic foam
- Multi-foil insulation
KNAUF, ROCKWOOL, CELOTEX, XTRATHERM, KAY-METZELER, CELLECTA, LOW-E, THINSULEX
Pitched roofs are very popular in many types of commercial and public buildings and can be constructed in two ways with a ceiling and without a ceiling, depending on the building specification and design. Some designs do not include ceiling and the height of the pitched roof is used to create light, attractive, interiors. Some specifications require the roof void to be utilised as an additional room. When converting your attic into a room, insulation is placed in between the rafters to create a worm roof.
Various products can be used for pitched roof insulation: semi-rigid insulation boards such as expanded polystyrene board, extruded polystyrene board, glass fibre batts, mineral fibre batts, urethane foam board or phenolic (fireproof) foam boards. If a first layer of insulation is placed between rafters, a second, thin layer is applied to the underside of the rafters to avoid thermal bridging. Glass fibre quilt and mineral fibre quilt can also be used. A vapour check should be installed on the warm side of the insulation and ventilation above. These materials can be held in place by a plaster lining board which also provides the necessary fire protection.
Methods used for insulation will solely depend on the design and building specification.
Following choices are available:
Pitched roof with unutilised roof void insulated at ceiling level
Insulation placed at ceiling level creates a cold roof space; and overall is the lowest cost option for insulating a roof due to a low quantity of insulation material needed. High levels of thermal insulation can be achieved because there is virtually no restriction on the thickness of insulation that can be installed. There are two options when insulating at ceiling level to provide sufficient ventilation of the roof and eliminate moisture condensation; insulating to achieve:
- Cold ventilated roof:
- Cold breathing' roof:
Cold ventilated roof insulated at ceiling level contains no vapour control layer; instead, water vapour enters loft through gaps and cracks in ceiling and by diffusion through ceiling plaster. Impermeable bituminous felt underlay placed underneath tiles and slates traps moisture in loft. To eliminate condensation, ventilation trays are created at the eaves of pitched roof to provide clear air path above insulation. Air continuously enters loft through the ventilation trays and leaves through the ridge gap on top of the roof providing cross ventilation to eliminate vapour and defuse moisture, leaving the loft space cold, draughty and dusty.
In a more modern cold breathing roof insulated at ceiling level, vapour control layer is placed underneath insulation to reduce vapour entering the loft. Ventilation space is created by counter battens which allow air to circulate underneath tiles and slates providing continuous diffusion of moisture leaving the loft space clean, dry and drought free. It is recommended to use breathing roof construction for all pitched roofs.
Utilised pitched roof void insulated between rafters
Several methods are used to insulate utilised roof void depending on specification. Following choices can be used:
- warm breathing roof insulated between rafters,
- warm breathing roof insulated above and between rafters,
- warm breathing' roof with vapour permeable underlay as tiling underlay
- warm ventilated roof
In a warm breathing roof vapour control layer must be used to underside of insulation to prevent moisture condensation. In a warm ventilated roof it is essential to provide 50mm ventilated airspace between the insulation and the tiling underlay to provide constant diffusion of vapour. If rafter depth is insufficient to accommodate the required thickness of insulation and the 50mm ventilated airspace, an insulated dry lining is recommended to minimise thermal bridging. Ventilation openings should also be provided. At the eaves, ventilation openings should be 25mm continuous gap and at the ridge - 5mm continuous gap on each side of the ridge. A vapour control layer also must be applied to the warm side of the insulation.
Pitched roof with no ceiling insulated between rafters
Insulating this type of roof is a complex task and can be designed in several ways depending on specification:
- Hybrid pitched roof with a single layer insulation between rafters
- Hybrid pitched roof twin insulated; between and below rafters
Insulationshop.co offers a wide range of pitched roof insulation from manufacturers Xtratherm, Celotex, Knauf, Kay Metzeler, Cellecta and more. For more information about particular products please see product description.
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12mm Celotex TB4000 PIR Insulation Board
1200x2400mm - 2.88m2 show quantity discountsDelivery Time: 2 - 3 days
Guide Price: £15.12 (£18.14 inc VAT)
£5.25/m2 (£6.30/m2 inc VAT)
show quantity discountsCelotex TB4012 is targeted at cut-to-fit applications between rafters or joists and enables users to achieve lower U-values with a single layer of insulation than has previously been possible. TB4012 is also appropriate for use in floors and walls. With low emissivity foil facings, TB4012 is manufac..
50mm Celotex GA4000 PIR Insulation Board
2400x1200mm - 2.88m2 show quantity discountsDelivery Time: 1 - 2 days
£23.38 (£28.06 inc VAT)
£8.12/m2 (£9.74/m2 inc VAT)
show quantity discounts50mm Celotex GA4050 is a multi-purpose insulation board that provides solution to overcome from the localized thermal bridges problem. Featuring a low emissivity foil facings, this board has been manufactured from tough polyisocyanurate (PIR) by using a perfect mix of certain blowing agent..
110mm Celotex XR4000 PIR Insulation Board
2400x1200mm - 2.88m2 show quantity discountsDelivery Time: 1 - 2 days
Guide Price: £66.56 (£79.87 inc VAT)
£23.11/m2 (£27.73/m2 inc VAT)
show quantity discountsCelotex XR4110 is targeted at cut-to-fit applications between rafters or joists and enables users to achieve lower U-values with a single layer of insulation than has previously been possible. XR4110 is also appropriate for use in floors and walls. With low emissivity foil facings, XR4110 is manufac..
150mm Rockwool Roll Loft Insulation
3650x1200mm - 4.38m2 show quantity discountsDelivery Time: 1 - 2 days
Guide Price: £36.60 (£43.92 inc VAT)
£8.36/m2 (£10.03/m2 inc VAT)
show quantity discounts150mm Rockwool Roll Loft Insulation is a multi-functional medium-density insulation roll, especially designed for improving thermal performance in roofs and lofts, and acoustic performance and sound reduction in suspended ceilings. It can be used in number of different applications in commercial, in..
25mm Celotex FR5000 Fire Resistant PIR Insulation Board (pack of 16)
1200x2400mm - 46.08m2 Delivery Time: 3 - 5 days
Celotex FR5025 is one of the available dimensions of the Celotex FR5000 PIR insulation boards made from polyisocyanurate rigid core and faced on both side with low emissivity aluminum foils for improved thermal performance. The product is applicable to different types of constructions incl..
30mm Thinsulex TLX Silver Multi-foil Insulation
1.2m x 10m - 12m2 show quantity discountsDelivery Time: 2 - 3 days
£83.94 (£100.73 inc VAT)
£7.00/m2 (£8.40/m2 inc VAT)
show quantity discounts30mm TLX Silver Multi-foil is an insulation material comprising outer layers of coated metallised film, laminated to a non-woven polypropylene fabric enclosing the core and welded along both long edges. The core of the products consists of five layers of polyester fibre wadding separated by four met..
30mm Alumaflex Multifoil Insulation
1.2m x 10m (12m2) show quantity discountsDelivery Time: 2 - 3 days
£92.45 (£110.94 inc VAT)
£7.70/m2 (£9.24/m2 inc VAT)
show quantity discounts30mm Alumaflex Multifoil insulation is a sophisticated multi layer radiant barrier of low emissivity. This product comprises 14 layers where the outer layer is a PET (polyethylene terephthalate) fused to a PE (polyethylene) bubble layer which is then fused to a non-woven polypropylene backing. The c..
25mm Kooltherm K7 Pitched Roof Board Kingspan (pack of 12)
K7 2400x1200 - 34.56m2 show quantity discountsDelivery Time: 3 - 5 days
£295.01 (£354.01 inc VAT)
£8.54/m2 (£10.25/m2 inc VAT)
show quantity discounts25mm Kingspan Kooltherm K7 Pitched Roof Board is the rafter/joist level insulation comprising a premium performance rigid thermoset phenolic insulation core faced on both sides with a low emissivity composite foil facing. This reflective, low emissivity surface improves the thermal resista..
25mm Earthwool RS45 Universal Insulation Slab Knauf (pack of 20)
1200x600 - 14.4m2 show quantity discountsDelivery Time: 2 - 3 days
Guide Price: £38.91 (£46.69 inc VAT)
£2.70/m2 (£3.24/m2 inc VAT)
show quantity discounts25mm Earthwool RS45 Universal Slabs are unfaced, rock mineral wool slabs, available in a range of densities from 33 to 200 kg/m3. The standard product is supplied unfaced, but slabs can also be manufactured with a factory applied foil or tissue facing and are also available with a water repellent ad..
50mm Earthwool RS60 Universal Insulation Slab Knauf (pack of 9)
1200x600 - 6.48m2 show quantity discountsDelivery Time: 1 - 2 days
Guide Price: £38.91 (£46.69 inc VAT)
£6.00/m2 (£7.20/m2 inc VAT)
show quantity discountsEarthwool RS60 Universal Slabs are unfaced, rock mineral wool slabs, available in a range of densities from 33 to 200 kg/m3. The standard product is supplied unfaced, but slabs can also be manufactured with a factory applied foil or tissue facing and are also available with a water repellent additiv..
50mm Earthwool RS100 Universal Insulation Slab Knauf (pack of 6)
1200x600 - 4.32m² show quantity discountsDelivery Time: 2 - 3 days
Guide Price: £33.11 (£39.73 inc VAT)
£7.66/m2 (£9.19/m2 inc VAT)
show quantity discounts50mm Earthwool Universal Slabs are unfaced, rock mineral wool slabs, available in a range of densities from 33 to 200 kg/m3. The standard product is supplied unfaced, but slabs can also be manufactured with a factory applied foil or tissue facing and are also available with a water repellent additiv..
50mm Earthwool Flexible Insulation Slab Knauf (pack of 12)
1200x600 - 8.64m² show quantity discountsDelivery Time: 2 - 3 days
£45.31 (£54.37 inc VAT)
£5.24/m2 (£6.29/m2 inc VAT)
show quantity discounts50mm Earthwool Flexible is a non-combustible, inorganic rock mineral wool slab, used for thermal and acoustic insulation and specifically designed for installation by friction fitting. Earthwool Flexible is odourless, non-hygroscopic, rot proof, does not sustain vermin and will not encourage th..
50mm Rockwool Flexi Insulation Slab 1200mm x 600mm (pack of 12)
1200x600mm - 8.64m2 show quantity discountsDelivery Time: 1 - 2 days
£35.66 (£42.79 inc VAT)
£4.13/m2 (£4.96/m2 inc VAT)
show quantity discounts50mm Rockwool Flexi Insulation Slab is a flexible thermal and acoustic insulation product made from volcanic rock, thus extremely durable, fire resistant and applicable to various constructions including walls, partitions, roofs and floors. It comes with an innovative flexible edge on one side,..
Reflective Foil Insulation Low-E (5m²).
1.25m x 4m - 5m2 - Free Delivery show quantity discountsDelivery Time: 2 - 3 days
£42.76 (£51.31 inc VAT)
£8.55/m2 (£10.26/m2 inc VAT)
show quantity discountsLow-E Reflective Foil Insulation is a revolutionary product used in all areas of construction from residential homes, commercial properties right to industrial buildings. It greatly contributes to reducing carbon dioxide emission of your house while saving energy and more importantly money. Low-E is..
Reflective Foil Insulation Low-E Perforated - Breathable (15m2).
1.25m x 12m - 15m2 - Free Delivery show quantity discountsDelivery Time: 2 - 3 days
£94.88 (£113.86 inc VAT)
£4.74/m2 (£5.69/m2 inc VAT)
show quantity discountsJust like the standard Low-E product, Low-E Perforated gives you all the benefits of a reflective insulation however with this reflective foil the company has developed a unique product that is breathable. Low-E PERF reflective foil is usually used to the exterior side of a secondary insulation to a..
Low - E Seam Tape - Scrimmed Foil Tape
65mm x 46m show quantity discountsDelivery Time: 2 - 3 days
£17.00 (£20.40 inc VAT)
show quantity discountsAlways tape Low-E when surfaces are clean and dry. Low-E should be taped at junctions with walls, windows and doors.When joining or replacing sections of Low-E, Low-E Seam Tape should always be used. All seams that are exposed to conditioned spaces must be taped with Low-E Seam Tape. Use a..
25mm Yelofoam X2i Cellecta
2500x600mm - 1.5m2 Delivery Time: 2 - 4 days
Guide Price: £17.72 (£21.26 inc VAT)
£11.81/m2 (£14.17/m2 inc VAT)
25mm Cellecta Yelofoam is made of extruded polystyrene (XPS) foam blown with a mix of HFA & CO2 gases, containing a yellow pigment, flame retardant additive and nucleating agent. Cellecta insulation products are manufactured to the highest possible specification. Ex All products physical propert..
20mm Kingspan Thermapitch TP10 Pitched Warm Roof Insulation Board
TP10 1200x2400 show quantity discountsDelivery Time: 1 - 2 days
£18.02 (£21.62 inc VAT)
£6.26/m2 (£7.51/m2 inc VAT)
show quantity discounts20mm Kingspan Thermapitch TP10 is the rafter level insulation comprising of a high performance rigid thermoset insulation core faced on both sides with a low emissivity composite foil facing. The product is manufactured with a blowing agent that has zero Ozone Depletion Potential..
15mm Xtratherm PIR Rigid Insulation Board
TThin-R - 2400 x 1200 - 2.88m2 show quantity discountsDelivery Time: 3 - 5 days
Guide Price: £11.98 (£14.38 inc VAT)
£4.16/m2 (£4.99/m2 inc VAT)
show quantity discounts15mm Xtratherm Thin-r is a foil faced Polyisocyanurate (PIR) insulation board formed by a blowing process which generates rigid foam composed of fine cells filled with Pentane blowing agent trapped within the foam. Pentane has very good insulating properties and gives Thin-r superb insulating capabi..
25mm Xtratherm Safe-R Phenolic Insulation Board (pack of 12)
2400x1200 - 34.56m2 show quantity discountsDelivery Time: 2 - 3 days
Guide Price: £293.96 (£352.75 inc VAT)
£8.51/m2 (£10.21/m2 inc VAT)
show quantity discounts25mm Xtratherm Safe-R Phenolic foam is a superior performance rigid insulation with enhanced fire performance, consisting of a Class O phenolic foam core with negligible smoke obscuration. Safe-R is faced with low emissivity aluminium facings both sides, and has a thermal conductivity as low as 0.02..
25mm EPS70 Polystyrene Insulation Board Kay-Metzeler (pack of 12)
2400x1200mm - 34.56m2 show quantity discountsDelivery Time: 2 - 3 days
£69.17 (£83.00 inc VAT)
£2.00/m2 (£2.40/m2 inc VAT)
show quantity discounts25mm EPS70 Kay-Metzeler boards are produced by cutting expanded foam blocks. Placed above a concrete slab or a precast concrete floor in domestic ground-floor constructions, then finished with a wearing layer of chipboard to satisfy the Building Regulations' U-value requirements. Kay-Metzeler achiev..
25mm EPS70 Polystyrene Insulation Board Jablite (pack of 12)
2400x1200 (34.56m2) show quantity discountsDelivery Time: 2 - 3 days
£69.17 (£83.00 inc VAT)
£2.00/m2 (£2.40/m2 inc VAT)
show quantity discounts25mm Jablite EPS is a lightweight cellular plastic material suitable for a wide range of building insulation applications. It is an excellent insulating medium which exhibits consistent thermal performance over the range of temperatures normally encountered in buildings. The material is versatile, l..
30mm Rockwool RW3 Slab (Prorox SL930) - pack of 15
1200x600mm - 10.8m2 show quantity discountsDelivery Time: 1 - 2 weeks
Guide Price: £33.90 (£40.68 inc VAT)
£3.14/m2 (£3.77/m2 inc VAT)
show quantity discounts30mm Rockwool RW3 Slab (Prorox SL 930) is a semi-rigid resin bonded slab, providing great thermal, acoustic and fire resistance, designed to be used in various applications in floors, walls and roofs, including special applications in industrial buildings for insulation of ships, offshore plat..
50mm Rockwool RW5 Universal Insulation Slab (Prorox SL960) - pack of 4
RW5 50mm - 2.88m2 show quantity discountsDelivery Time: 2 - 3 days
£26.38 (£31.66 inc VAT)
£9.16/m2 (£10.99/m2 inc VAT)
show quantity discounts50mm Rockwool RW5 (Prorox SL960) is a high quality resin bonded rigid slab for a wide range of thermal, acoustic and fire insulation requirements both within buildings and for industry. They are suitable for many applications including thermal insulation for floors, walls, roofs and boiler rooms. Th..
50mm ThermaFleece CosyWool Roll 370mm Wide (pack of 3)
13000x370 - 14.43m2 Delivery Time: 2 - 3 days
Guide Price: £59.48 (£71.38 inc VAT)
£4.12/m2 (£4.94/m2 inc VAT)
Thermafleece CosyWool roll is a versatile low density insulation rich in British sheeps wool, which would give you all round performance and value for money. It contains 75% Sheeps wool, 15% recycled polyester and 10% polyester binder with a high recycled content making it highly environmentall..
100mm Rockwool RollBatt Loft Insulation
4800x1200mm - 5.76m2 show quantity discountsDelivery Time: 1 - 2 days
£37.11 (£44.53 inc VAT)
£6.44/m2 (£7.73/m2 inc VAT)
show quantity discounts100mm Rockwool RollBatt Loft Insulation is a multi-functional, medium-density lightweight insulation matt, especially designed for improving thermal and acoustic performance, thus reducing fuel consumption and utility bills, when used in roofs, partitions and suspended ceilings. It can be used in nu..
25mm EcoTherm EcoVersal PIR Insulation Board
1200x2400mm - 2.88m2 show quantity discountsDelivery Time: 1 - 2 days
£15.95 (£19.14 inc VAT)
£5.54/m2 (£6.65/m2 inc VAT)
show quantity discounts25mm Eco-Versal is a foil faced universal solution for insulating walls, floors, pitched roofs, dormer cheeks and ceilings. It is ideal for insulating timber frame walls and can also be used to insulate solid walls internally. EcoTherm Eco-Versal comprises a fibre free rigid polyisocyanurate (PIR) i..
25mm Eurothane GP PIR Insulation Board Recticel
GP1200x2400 - 2.88m2 show quantity discountsDelivery Time: 1 - 2 days
£17.03 (£20.44 inc VAT)
£5.91/m2 (£7.09/m2 inc VAT)
show quantity discounts25mm Eurothane GP comprising a rigid polyisocyanurate (PIR) core faced on both sides with a gas tight multilayer composite aluminium foil facing is the ideal choice for pitched roof, floor or framed wall applications. With a low thermal conductivity value (0.022 W/mK) providing an excellent the..
25mm Rockwool RWA45 Slab (Prorox SL920) - pack of 16
600x1200mm - 11.52m² show quantity discountsDelivery Time: 2 - 3 days
£29.14 (£34.97 inc VAT)
£2.53/m2 (£3.04/m2 inc VAT)
show quantity discounts25mm Rockwool RWA45 is a high quality resin bonded flexible slab for a wide range of thermal, acoustic and fire insulation requirements both within buildings and for industry. They are suitable for many applications including thermal insulation for floors, walls, roofs and boiler rooms. The str..
35mm Actis Triso Super 10+ Multi-Foil Insulation
1.6x10m - 16m2 Delivery Time: 2 - 3 days
Guide Price: £194.98 (£233.98 inc VAT)
£12.19/m2 (£14.63/m2 inc VAT)
Actis Triso Super 10+ is a thin multi-foil insulation, comprising of even 19 separate layers, including two metallic films with reinforcing mesh, three wadding layers, eight foam layers and six internal reflective films. It has very wide application, but is most suitable for roof and loft insulation..