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Floor Insulation

When insulating a concrete slab floor, two choices are available: insulating below or above the slab. The heating pattern should be considered before deciding which method of insulation will be used. When quick heating response time is required, for example when a family returns home in the evening, insulation above the slab should be used. Where heating is used over prolonged periods for example when the house is occupied throughout the day, the thermal mass of a slab placed above the insulation should be considered to reduce temperature fluctuation and provide steady temperatures (slower heating and cooling of space). Those considerations will allow most efficient use of heating energy.

Amount of load the insulation will be exposed to should also be considered prior to deciding which type of material is best for the insulation; to ensure adequate compression resistance of an insulation product and to lower the effects of the compressive load applied by any loading. Two types of load can be distinguished: dead load and design load.

Dead load is the weight of the floor finish upon the insulation material.

Design load is the load applied in use e.g. furniture. Point loading should be considered in calculating the required thickness of floor finish, particularly where the insulation is located above the slab.

When insulating above the concrete slab, the floor finish over the insulation can be either screed or boarding. It is argued that a screed finish is more durable and can offer some thermal mass otherwise absent. Board finishes, on the other hand, can be quickly installed and provide a quicker thermal response time.

In a timber suspended floor a range of insulation materials can be fitted between the joists to reduce overall heat loss. One of the most important issues with timber floors is their vulnerability to air leakage. Where old floorboards are relayed or new ones installed, careful attention is needed to ensure that all joints between boards are adequately sealed. Insulation should be taken right up to the edge of the floor and any space close to the outside wall filled with insulation to avoid any gaps.

To summarize, insulation above the slab increases the heating response time. Temperatures will increase more quickly when the heating system is switched on in comparison with below slab insulation. In this setting the insulation zone can be used to run services and under-floor heating. The effect of temperature regulation by thermal mass is unavailable in above the slab insulation. Point loading requires careful specification to make sure it does not damage the area of insulation beneath. It is not advisable to use above slab insulation in conjunction with timber-based flooring in wet rooms such as kitchens and bathrooms.

Below the slab insulation provides thermal mass which helps maintain steady temperatures. As a result, rooms take longer to heat in comparison with an above-slab technique. This is particularly useful in south-facing rooms. In this setting thickness of insulation is less restricted than for an above-slab condition and point loading is less of an issue because the load is spread over the concrete slab.

Suspended timber floor provides relatively quick heating response time. It also ensures minimal additional loading to the structure. This setting provides no thermal mass which causes high fluctuation of floor temperature. It can also be prone to air leakage and maintaining sub-floor ventilation can reduce the effectiveness of the insulation.

Insulationshop.co offers wide range of floor insulation products from manufacturers: KNAUF, URSA, KAY METZELER, XTRATHERM and CELOTEX suitable to use with all kinds of floor specification. For more information about particular product please see product description.

R-value Comparison Chart of Floor Insulation products available at Insulation Shop

Legend

1* URSA Acoustic Insulation Roll

2* Superglass Multi Acoustic Insulation Roll

3* Rockwool RW3 Slab (Prorox SL 930)

4* Earthwool Acoustic Insulation Roll, Earthwool RS45 Universal Slab, Earthwool RS60 Universal Slab, Earthwool RS100 Universal Slab, Rockwool RWA45 (Prorox SL920)

5* Earthwool Flexible Slab, Rockwool Flexi Insulation Slab

6* Rockwool Hardrock Multi-Fix Dual Density Board

7* Rockwool RW5 Slab (Prorox SL960)

8* Celotex FI5000 Insulation Board, Celotex FR5000 Fire Resistant Insulation Board

9* Celotex TB4000 Insulation Board, Celotex GA4000 Insulation Board, Celotex XR4000 Insulation Board,  Xtratherm Thin-R Insulation Board,  Xtratherm Thin-R Hyfloor Insulation Board, Recticel Eurothane GP Insulation Board

10* Kingspan Thermafloor TF70 Insulation Board

11* Kingspan Kooltherm K103 Floorboard

12* Kingspan Kooltherm K3 Floorboard

13* Xtratherm Safe-R insulation Board

14* Cellecta Yelofoam X2i

15* Grey Polystyrene (Graphite) EPS

16* Floormate 300A XPS, Cellecta Hexatherm XFLOOR 250 XPS, Cellecta Hexatherm XFLOOR 300 XPS, Cellecta Hexatherm XCHiP Thermal Laminate Chipboard, Cellecta Hexatherm XCPL Board, Ravatherm Polyfoam Floorboard Standard and Extra Grade

17* Cellecta Hexatherm XFLOOR 500 XPS, Cellecta Hexatherm XCHiP Thermal Laminate Chipboard, Cellecta Hexatherm XCPL Laminated Board, Sundolitt XPS300 Extruded Polystyrene Board, Ravatherm Polyfoam Floorboard - Super grade

18* Cellecta Hexatherm XPOOL Swimming Pool XPS Insulation Board, Kingspan Styrozone N300R XPS Board, Cellecta Hexatherm XFLOOR 500 Thermal Floor Insulation Board

19* EPS100 Polystyrene Insulation Board Jablite, Kingspan Styrozone N500R XPS Board

20* EPS70 Polystyrene Insulation Board Kay-Metzeler 

21* Jablite EPS70 Polystyrene Insulation Board

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25mm URSA Acoustic Insulation Roll
Guide Price
Brand: URSA Model and Size: 1.2x20m - 24.00m2
Delivery Time: 1 - 2 days
25mm URSA Acoustic Roll is a lightweight, non-combustible, unfaced glass mineral wool product used for sound insulation of lightweight metal or wooden stud partitions in both new and existing buildings. This product is manufactured from sand, an abundant, sustainable resource and may also utilise up..
Guide Price: £44.33
£53.20 inc VAT
Brand: Knauf Model and Size: 2x11.1m x 1.2m - 26.64m2
Delivery Time: 1 - 2 days
25mm Knauf Earthwool Acoustic Roll is a flexible glass mineral wool quilt which is lightweight, flexible, resilient and non-combustible. The rolls are 1200mm wide and ready cut to produce 2 rolls in 600mm widths. Earthwool Acoustic Roll is manufactured to a minimum density of 10kg/m3. It is spe..
£39.85
£47.82 inc VAT
12 (0e 0s)
25mm Rocksilk RS45 Universal Insulation Slab Knauf (pack of 20)
Guide Price
Brand: Knauf Model and Size: 1200x600 - 14.4m2
Delivery Time: 2 - 3 days
25mm Rocksilk RS45 Universal Slabs are rock mineral wool slabs, available in a range of densities and designed for use in multiple thermal and acoustic applications where density is critical. The standard product is supplied unfaced, but slabs can also be manufactured with a factory applied foi..
Guide Price: £41.63
£49.96 inc VAT
50mm Rocksilk RS60 Universal Insulation Slab Knauf (pack of 9)
Guide Price
Brand: Knauf Model and Size: 1200x600 - 6.48m2
Delivery Time: 1 - 2 days
50mm Rocksilk RS60 Universal Slabs are rock mineral wool slabs, available in a range of densities and designed for use in multiple thermal and acoustic applications where density is critical. The standard product is supplied unfaced, but slabs can also be manufactured with a factory applie..
Guide Price: £41.63
£49.96 inc VAT
50mm Rocksilk RS100 Universal Insulation Slab Knauf (pack of 6)
Guide Price
Brand: Knauf Model and Size: 1200x600 - 4.32m2
Delivery Time: 2 - 3 days
50mm Rocksilk RS100 Universal Slabs are rock mineral wool slabs, available in a range of densities and designed for use in multiple thermal and acoustic applications where density is critical. The standard product is supplied unfaced, but slabs can also be manufactured with a factory appli..
Guide Price: £35.43
£42.52 inc VAT
Brand: Knauf Model and Size: 1200x600 - 8.64m2
Delivery Time: 2 - 3 days
50mm 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..
£45.31
£54.37 inc VAT
30mm Rockwool RW3 Slab (Prorox SL930) - pack of 15
Guide Price
Brand: Rockwool Model and Size: 1200x600mm - 10.8m2
Delivery Time: 1 - 2 days
30mm 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..
Guide Price: £58.64
£70.37 inc VAT
50mm Rockwool RW5 Universal Insulation Slab (Prorox SL960) - pack of 4
Guide Price
Brand: Rockwool Model and Size: RW5 50mm - 2.88m2
Delivery Time: 2 - 3 days
50mm 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..
Guide Price: £42.82
£51.38 inc VAT
25mm Rockwool RWA45 Slab (Prorox SL920) - pack of 16
Guide Price
Brand: Rockwool Model and Size: 600x1200mm - 11.52m2
Delivery Time: 3 - 5 weeks
25mm 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..
Guide Price: £28.50
£34.20 inc VAT
7 (0e 0s)
50mm Rockwool Flexi Insulation Slab 1200 x 400mm (pack of 12)
Guide Price
Brand: Rockwool Model and Size: 1200x400mm - 5.76m2
Delivery Time: 1 - 2 days
50mm x1200mm x 400mm Rockwool Flexi Insulation Slab is a unique semi-rigid thermal and acoustic insulation product made from volcanic rock. It has a flexible edge, specifically developed using patented technology for a fast and easy, perfect friction fit between timber and metal frame syst..
Guide Price: £30.15
£36.18 inc VAT
Brand: Rockwool Model and Size: 1200x600mm - 8.64m2
Delivery Time: 1 - 2 days
50mm x1200mm x 600mm Rockwool Flexi Insulation Slab is a unique semi-rigid thermal and acoustic insulation product made from volcanic rock. It has a flexible edge, specifically developed using patented technology for a fast and easy, perfect friction fit between timber and metal frame syst..
£42.50
£51.00 inc VAT
5 (11e 0s)
60mm Rockwool Hardrock Multi-Fix (Dual Density ) Fleece Faced Board (pallet of 20)
Guide Price
Brand: Rockwool Model and Size: 1200x1000 - 24.00m2
Delivery Time: 1 - 2 days
60mm Rockwool Hardrock Multi-Fix Dual Density Fleece Faced Boards are manufactured from renewable volcanic stone which produces a non-combustible roofing insulation board. A uniquely versatile solution suitable for all roof covering types - torch, pour and roll, single ply, EPDM, liquid applied and ..
Guide Price: £522.27
£626.72 inc VAT
Brand: Rockwool Model and Size: 1200x600mm - 0.72m2
Delivery Time: 1 - 2 days
50mm Rockwool Ablative Coated Batt is intended to act as an airseal barrier to reinstate the fire resistance and acousticperformances of concrete floors, masonry walls and dry wall systems when voids have been created for the passage of services. This includes pipes made of plain or stainless steel,..
£16.08
£19.30 inc VAT
36 (49e 0s)
20mm Celotex TB4000 PIR Insulation Board - TB4020
Guide Price
Brand: Celotex Model and Size: 1200x2400mm - 2.88m2
Delivery Time: 1 - 5 working days
Celotex TB4020 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. It is also appropriate for use in floors and walls. With low emissivity foil facings, TB4020 is manufa..
Guide Price: £23.48
£28.18 inc VAT
0 (1e 0s)
25mm Celotex FR5000 Fire Resistant PIR Insulation Board (pack of 16)
Guide Price
Brand: Celotex Model and Size: 1200x2400mm - 46.08m2
Delivery Time: Out Of Stock
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..
Brand: Recticel Model and Size: GP1200x2400 - 2.88m2
Delivery Time: 1 - 5 working days
25mm 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..
£19.98
£23.98 inc VAT
75mm Xtratherm Thin-R Hyfloor XT/HYF Under Floor PIR Insulation Board - Pack of 4
Guide Price
Brand: Xtratherm Model and Size: 1200x2400mm - 11.52m2
Delivery Time: 1 - 5 working days
75mm Xtratherm Thin-R Hyfloor XT/HYF is a high performance floor Insulation board with superior thickness to performance ratio allowing the lower targets required under the new Building Regulations to be achieved with minimum thicknesses. Xtratherm Thin-R Hyfloor XT/HYF is a high performance fo..
75mm Celotex FI5000 Underfloor Heating Insulation Board (pack of 16) - pallet of 2 packs
Guide Price
Brand: Celotex Model and Size: 1200x2400mm - 92.16m2
Delivery Time: Out Of Stock
75mm Celotex FI5000 is a premium flooring insulation board with enhanced thermal performance as well as an A rating when compared to the BRE Green Guide and an innovative cement compatible composite facer with a built-in vapour control layer (VCL), enabling direct screed, without the need for an add..
Guide Price: £3,119.84
£3,743.81 inc VAT
Brand: Kingspan Model and Size: TF70 - 1200x2400
Delivery Time: 1 - 5 working days
20mm Kingspan TF70 comprises 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(ODP) and low Global Warming Potential (GWP).CHARACT..
£35.42
£42.50 inc VAT
25mm Kingspan Kooltherm K3 Phenolic Floorboard (pack of 12) 25mm Kingspan Kooltherm K3 Phenolic Floorboard (pack of 12)
Guide Price
Brand: Kingspan Model and Size: 2400 x 1200 (34.56m2)
Delivery Time: 3 - 5 days
25mm Kingspan Kooltherm K3 Floorboard is a floor insulation comprising a premium performance rigid thermoset insulation core faced on both sides with a flexible facing. The product is manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GW..
Guide Price: £282.15
£338.58 inc VAT
Brand: Kingspan Model and Size: 2400x1200mm - 34.56m2
Delivery Time: 3 - 5 days
25mm Kingspan Kooltherm K103 Floorboard is a premium performance lower lambda insulation with a fibre-free rigid thermoset phenolic core manufactured with a blowing agent that has zero Ozone Depletion Potential (ODP) and low Global Warming Potential (GWP). The board faced on both sides with a g..
£467.68
£561.22 inc VAT
25mm Xtratherm Safe-R SR/PR Phenolic Insulation Board (pack of 12)
Guide Price
Brand: Xtratherm Model and Size: 2400x1200 - 34.56m2
Delivery Time: 2 - 3 days
25mm Xtratherm Safe-R SR/PR 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 conductivit..
Guide Price: £362.16
£434.59 inc VAT
Brand: Jablite Model and Size: 2400x1200 (34.56m2)
Delivery Time: 2 - 3 days
25mm 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..
£119.20
£143.04 inc VAT
Brand: Kay-Metzeler Model and Size: 2400x1200mm - 34.56m2
Delivery Time: 2 - 3 days
25mm 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..
£97.52
£117.02 inc VAT
50mm EPS100 Polystyrene Insulation Board Jablite (pack of 12)
Guide Price
Brand: Jablite Model and Size: 2400x1200 - 34.56m2
Delivery Time: 1 - 2 weeks
50mm Jablite EPS 100 board is a lightweight and cost efficient product which can be used for insulation of different constructions, including roofs, floors and walls, since it provides constant and stable thermal performance under different temperature conditions. It is made from expanded polystyren..
Guide Price: £189.60
£227.52 inc VAT
26mm Cellecta Hexatherm XCPL High Impact Faced Thermal Laminate Board for Car Park Soffits
Guide Price
Brand: Cellecta Model and Size: 1200x2400mm - 2.88m2
Delivery Time: 2 - 4 days
26mm Cellecta Hexatherm XCPL is a high performance extruded polystyrene thermal insulation board bonded to an high impact thermal laminate facing, suitable for car parks and soffits. It combines the benefits of high performance extruded polystyrene with a facing board to produce a composite thermal ..
38mm Cellecta Hexatherm XCHiP Thermal Laminate Chipboard
Guide Price
Brand: Cellecta Model and Size: 600x2400mm - 1.44m2
Delivery Time: 2 - 4 days
38mm Cellecta XCHiP is a high performance insulation board with a 18mm chipboard laminate facing. Cellecta XCHiP combines the benefits of HEXATHERM high performance thermal insulation with a P5 moisture resistant, tongue and groove chipboard to produce a high compressive strength, interlocking floor..
20mm Cellecta Hexatherm XFLOOR 250 Thermal Floor Insulation Board
Guide Price
Brand: Cellecta Model and Size: 600x2500mm - 1.50m2
Delivery Time: 2 - 4 days
20mm Hexatherm XFLOOR 250 extruded polystyrene thermal insulation boards are designed specifically for domestic, commercial and industrial flooring applications where a high resistance to compression and water absorption is required. XFLOOR floor insulation boards are ideal for a multitude of f..
40mm Cellecta Hexatherm XFLOOR 300 Thermal Floor Insulation Board
Guide Price
Brand: Cellecta Model and Size: 600x2500mm - 1.50m2
Delivery Time: 2 - 4 days
40mm Hexatherm XFLOOR 300 extruded polystyrene thermal insulation boards are designed specifically for domestic, commercial and industrial flooring applications where a high resistance to compression and water absorption is required. XFLOOR floor insulation boards are ideal for a multitude of floor re..
50mm Cellecta Hexatherm XFLOOR 500 Thermal Floor Insulation Board
Guide Price
Brand: Cellecta Model and Size: 600x1250mm - 0.75m2
Delivery Time: 2 - 4 days
50mm Hexatherm XFLOOR 500 extruded polystyrene thermal insulation boards are designed specifically for domestic, commercial and industrial flooring applications where a high resistance to compression and water absorption is required. XFLOOR floor insulation boards are ideal for a multitude of floor re..
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