Floor Insulation

  • Acoustic floor panels
  • Acoustic screed overlay (rubber)
  • Polystyrene
  • PIR boards
  • Wool slabs and batts

Two types of floor are most often found in building constructions: concrete slab floor and suspended timber floor.

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.



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26mm Cellecta Hexatherm XCPL High Impact Faced Thermal Laminate Board for Car Park Soffits

26mm Cellecta Hexatherm XCPL High Impact Faced Thermal Laminate Board for Car Park Soffits

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 ..

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38mm Cellecta Hexatherm XCHiP Thermal Laminate Chipboard

38mm Cellecta Hexatherm XCHiP Thermal Laminate Chipboard

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..

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6mm ISORubber Base Acoustic Roll

6mm ISORubber Base Acoustic Roll

6mm - 10m2  show quantity discountsDelivery Time: 2 - 3 days

£72.00 (£86.40 inc VAT)

£7.20/m2 (£8.64/m2 inc VAT)

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ISORubber Base can be used in many acoustic flooring solutions. It is designed to provide a continuous unbreached separation between the floor screed and the structural wall and floor. IsoRubber Base is manufactured from 100% recycled or diverted landfill rubber. Being manufactured without blowing a..

£72.00 (£86.40 inc VAT)

£7.20/m2 (£8.64/m2 inc VAT)

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5mm Polyfoam Floorfoam Knauf

5mm Polyfoam Floorfoam Knauf

5mm - 112.50m2  show quantity discountsDelivery Time: 1 - 2 days

Guide Price: £154.54 (£185.45 inc VAT)

£1.37/m2 (£1.64/m2 inc VAT)

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Polyfoam Floorfoam is a closed cell extruded polyethylene foam available in roll form. The closed cell nature of Polyfoam Floorfoam makes it excellent at cushioning vibrations. It has been developed specifically to comply with Building Regulation requirements for a resilientlayer in separating floor..

Guide Price: £154.54 (£185.45 inc VAT)

£1.37/m2 (£1.64/m2 inc VAT)

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23mm KarmaFloor Acoustic Overlay Floor Chipboard

23mm KarmaFloor Acoustic Overlay Floor Chipboard

600x2400mm - 1.44m2  show quantity discountsDelivery Time: 3 - 5 days

Guide Price: £19.20 (£23.04 inc VAT)

£13.33/m2 (£16.00/m2 inc VAT)

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KarmaFloor Acoustic Overlay Chipboard is designed to reduce impact sound through floors using a heavy material isolated by a softer resilient layer. The board consists of a 5 mm closed cell, cross linked polyethylene resilient layer, laminated to moisture resistant tongue and groove chipboard. APPLI..

Guide Price: £19.20 (£23.04 inc VAT)

£13.33/m2 (£16.00/m2 inc VAT)

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12mm Celotex TB4000 PIR Insulation Board

12mm Celotex TB4000 PIR Insulation Board

1200x2400mm - 2.88m2  show quantity discountsDelivery Time: 2 - 3 days

£10.40 (£12.48 inc VAT)

£3.61/m2 (£4.33/m2 inc VAT)

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Celotex 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 manuf..

£10.40 (£12.48 inc VAT)

£3.61/m2 (£4.33/m2 inc VAT)

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110mm Celotex XR4000 PIR Insulation Board

110mm Celotex XR4000 PIR Insulation Board

2400x1200mm - 2.88m2  show quantity discountsDelivery Time: 1 - 2 days

Guide Price: £37.09 (£44.51 inc VAT)

£12.88/m2 (£15.46/m2 inc VAT)

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Celotex 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 manuf..

Guide Price: £37.09 (£44.51 inc VAT)

£12.88/m2 (£15.46/m2 inc VAT)

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25mm Celotex FR5000 Fire Resistant PIR Insulation Board (pack of 16)

25mm Celotex FR5000 Fire Resistant PIR Insulation Board (pack of 16)

1200x2400mm - 46.08m2  show quantity discountsDelivery Time: 3 - 5 days

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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..

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50mm Earthwool RS60 Universal Insulation Slab Knauf (pack of 9)

50mm Earthwool RS60 Universal Insulation Slab Knauf (pack of 9)

1200x600 - 6.48m2  show quantity discountsDelivery Time: 1 - 2 days

Guide Price: £30.78 (£36.94 inc VAT)

£4.75/m2 (£5.70/m2 inc VAT)

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Earthwool 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..

Guide Price: £30.78 (£36.94 inc VAT)

£4.75/m2 (£5.70/m2 inc VAT)

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50mm Earthwool Flexible Insulation Slab Knauf (pack of 12)

50mm Earthwool Flexible Insulation Slab Knauf (pack of 12)

1200x600 - 8.64m²  show quantity discountsDelivery Time: 2 - 3 days

£35.83 (£43.00 inc VAT)

£4.15/m2 (£4.98/m2 inc VAT)

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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..

£35.83 (£43.00 inc VAT)

£4.15/m2 (£4.98/m2 inc VAT)

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25mm URSA Acoustic Insulation Roll

25mm URSA Acoustic Insulation Roll

1.2x20m - 24.00m2  show quantity discountsDelivery Time: 1 - 2 days

Guide Price: £29.24 (£35.09 inc VAT)

£1.22/m2 (£1.46/m2 inc VAT)

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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: £29.24 (£35.09 inc VAT)

£1.22/m2 (£1.46/m2 inc VAT)

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50mm Rockwool Flexi Insulation Slab 1200mm x 600mm (pack of 12)

50mm Rockwool Flexi Insulation Slab 1200mm x 600mm (pack of 12)

1200x600mm - 8.64m2  show quantity discountsDelivery Time: 1 - 2 days

£28.05 (£33.66 inc VAT)

£3.25/m2 (£3.90/m2 inc VAT)

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50mm Rockwool Flexi Insulation Slab is a semi-rigid 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 s..

£28.05 (£33.66 inc VAT)

£3.25/m2 (£3.90/m2 inc VAT)

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100mm  Superglass Acoustic Insulation Roll 11m2

100mm Superglass Acoustic Insulation Roll 11m2

100mm - 11m2  show quantity discountsDelivery Time: 1 - 2 days

£39.98 (£47.98 inc VAT)

£3.63/m2 (£4.36/m2 inc VAT)

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100mm Multi Acoustic Roll is lightweight, flexible roll of mineral wool, designed to be used as an acoustic absorbent layer in timber and metal stud partitions and in separating walls and floors in accordance with Part E (England and Wales ) and Section 5 (Scotland) acoustic requirements. Multi Acou..

£39.98 (£47.98 inc VAT)

£3.63/m2 (£4.36/m2 inc VAT)

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25mm EPS70 Polystyrene Insulation Board Jablite (pack of 12)

25mm EPS70 Polystyrene Insulation Board Jablite (pack of 12)

2400x1200 (34.56m2)  show quantity discountsDelivery Time: 2 - 3 days

£43.20 (£51.84 inc VAT)

£1.25/m2 (£1.50/m2 inc VAT)

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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..

£43.20 (£51.84 inc VAT)

£1.25/m2 (£1.50/m2 inc VAT)

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25mm EPS70 Polystyrene Insulation Board Kay-Metzeler (pack of 12)

25mm EPS70 Polystyrene Insulation Board Kay-Metzeler (pack of 12)

2400x1200mm - 34.56m2  show quantity discountsDelivery Time: 2 - 3 days

£43.20 (£51.84 inc VAT)

£1.25/m2 (£1.50/m2 inc VAT)

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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 achie..

£43.20 (£51.84 inc VAT)

£1.25/m2 (£1.50/m2 inc VAT)

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25mm Kingspan Kooltherm K3 Floorboard (pack of 12)

25mm Kingspan Kooltherm K3 Floorboard (pack of 12)

2400 x 1200 (34.56m2)  show quantity discountsDelivery Time: 3 - 5 days

Guide Price: £239.68 (£287.62 inc VAT)

£6.94/m2 (£8.33/m2 inc VAT)

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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: £239.68 (£287.62 inc VAT)

£6.94/m2 (£8.33/m2 inc VAT)

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25mm Yelofoam X2i Cellecta

25mm Yelofoam X2i Cellecta

2500x600mm - 1.5m2  show quantity discountsDelivery Time: 2 - 4 days

Guide Price: £16.72 (£20.06 inc VAT)

£11.15/m2 (£13.38/m2 inc VAT)

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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 product’s’ physical prope..

Guide Price: £16.72 (£20.06 inc VAT)

£11.15/m2 (£13.38/m2 inc VAT)

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50mm Acoustic Isolating Strip.

50mm Acoustic Isolating Strip.

50mm-Free delivery  show quantity discountsDelivery Time: 2 - 3 days

£20.96 (£25.15 inc VAT)

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Acoustic Isolating Strip is used for preventing sound transfer by isolating partitioning, party walls or ceiling and floorboards from joists that they are attached to. It can be used in all forms of construction where there is any point of contact. APPLICATION New build Refurbishment/change of use P..

£20.96 (£25.15 inc VAT)

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50mm Celotex FF4000 Underfloor Heating Board (pack of 24)

50mm Celotex FF4000 Underfloor Heating Board (pack of 24)

FF4000 1200x2400 - 69.12m2  show quantity discounts

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50mm Celotex FF4000 Underfloor Heating Board (pack of 24) Size: 1200mm x 2400mm Area per pack: 69.12m2 Thermal conductivity: 0.022 W/Mk R-Value: 2.25m2K/W Compressive strength: ≥150kPa Water vapour resistance: >150 MNs/g Weight: 1.81kg/m2   Celotex..

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50mm Celotex GA4000 PIR Insulation Board

50mm Celotex GA4000 PIR Insulation Board

2400x1200mm - 2.88m2  show quantity discountsDelivery Time: 1 - 2 days

£17.85 (£21.42 inc VAT)

£6.20/m2 (£7.44/m2 inc VAT)

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50mm 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..

£17.85 (£21.42 inc VAT)

£6.20/m2 (£7.44/m2 inc VAT)

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50mm Earthwool RS100 Universal Insulation Slab Knauf (pack of 6)

50mm Earthwool RS100 Universal Insulation Slab Knauf (pack of 6)

1200x600 - 4.32m²  show quantity discountsDelivery Time: 2 - 3 days

Guide Price: £26.19 (£31.43 inc VAT)

£6.06/m2 (£7.27/m2 inc VAT)

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50mm 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..

Guide Price: £26.19 (£31.43 inc VAT)

£6.06/m2 (£7.27/m2 inc VAT)

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50mm Rockwool RW5 Universal Insulation Slab (Prorox SL960) - pack of 4

50mm Rockwool RW5 Universal Insulation Slab (Prorox SL960) - pack of 4

RW5 50mm - 2.88m2  show quantity discountsDelivery Time: 2 - 3 days

£20.09 (£24.11 inc VAT)

£6.98/m2 (£8.38/m2 inc VAT)

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50mm Rockwool RW5 (Prorox SL960) is a high quality resin bonded 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 stru..

£20.09 (£24.11 inc VAT)

£6.98/m2 (£8.38/m2 inc VAT)

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50mm ThermaFleece CosyWool Roll 370mm Wide (pack of 3)

50mm ThermaFleece CosyWool Roll 370mm Wide (pack of 3)

13000x370 - 14.43m2  Delivery Time: 2 - 3 days

Guide Price: £57.75 (£69.30 inc VAT)

£4.00/m2 (£4.80/m2 inc VAT)

Thermafleece CosyWool roll is a versatile low density insulation rich in British sheep’s wool, which would give you all round performance and value for money. It contains 75% Sheep’s wool, 15% recycled polyester and 10% polyester binder with a high recycled content making it highly environmenta..

Guide Price: £57.75 (£69.30 inc VAT)

£4.00/m2 (£4.80/m2 inc VAT)

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30mm Rockwool RW3 Slab (Prorox SL930) - pack of 15

30mm Rockwool RW3 Slab (Prorox SL930) - pack of 15

1200x600mm - 10.8m2  show quantity discountsDelivery Time: 3 - 5 days

Guide Price: £26.69 (£32.03 inc VAT)

£2.47/m2 (£2.96/m2 inc VAT)

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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: £26.69 (£32.03 inc VAT)

£2.47/m2 (£2.96/m2 inc VAT)

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3mm Cellecta DECKfon Ultralay Acoustic Soft Floor Covering

3mm Cellecta DECKfon Ultralay Acoustic Soft Floor Covering

1.2x15m - 18m2  show quantity discountsDelivery Time: 3 - 5 days

Guide Price: £159.82 (£191.78 inc VAT)

£8.88/m2 (£10.66/m2 inc VAT)

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Cellecta Deckfon Ultralay 3 is an acoustic improvement material made from recycled open cell polyurethane foam, used as soft floor covering, very lightweight and easy to cut into shape and install. Its high density and low resonance will considerably reduce sound transmission through concrete floors..

Guide Price: £159.82 (£191.78 inc VAT)

£8.88/m2 (£10.66/m2 inc VAT)

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45mm Cellecta Deckfon Batten

45mm Cellecta Deckfon Batten

45 mm  show quantity discountsDelivery Time: 3 - 5 days

Guide Price: £8.64 (£10.37 inc VAT)

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DECKfon Batten 45 acoustic battens are designed to be installed on steel, concrete and timber separating floors to deliver excellent soundproofing performance. DECKfon acoustic battens consist of a layer of recycled, low resonance, open-cell, flexible polyurethane foam bonded to an FSC certified tim..

Guide Price: £8.64 (£10.37 inc VAT)

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17mm Cellecta Deckfon MDF 17T Acoustic Overlay Board

17mm Cellecta Deckfon MDF 17T Acoustic Overlay Board

600x2400mm - 1.44m2  Delivery Time: 3 - 5 days

Guide Price: £31.26 (£37.51 inc VAT)

£21.71/m2 (£26.05/m2 inc VAT)

Cellecta Deckfon 17T is an acoustic overlay board designed for conversion and refurbishment projects, where the joists are covered with a timber decking and the ceiling is to be replaced, in order of improving acoustic performance. The same effect can be reached in concrete floors, where the impact ..

Guide Price: £31.26 (£37.51 inc VAT)

£21.71/m2 (£26.05/m2 inc VAT)

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15mm Cellecta Deckfon Ultramat 15 Acoustic Overlay Mat

15mm Cellecta Deckfon Ultramat 15 Acoustic Overlay Mat

1000x1200mm - 1.20m2  show quantity discountsDelivery Time: 3 - 5 days

Guide Price: £35.94 (£43.13 inc VAT)

£29.95/m2 (£35.94/m2 inc VAT)

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Cellecta Deckfon Ultramat 15 is an acoustic mat used for significantly improving acoustic insulation of decked timber floors, whenever the ceiling cannot be disturbed and the floor to ceiling height is restricted. The product consists of 3mm high density polymeric barrier and 9 mm resilient layer, b..

Guide Price: £35.94 (£43.13 inc VAT)

£29.95/m2 (£35.94/m2 inc VAT)

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Cellecta FIBREfon Micro 50 roll (pack of 3)

Cellecta FIBREfon Micro 50 roll (pack of 3)

1.2x7.2m - 8.64m2  show quantity discountsDelivery Time: 3 - 5 days

Guide Price: £50.61 (£60.73 inc VAT)

£5.86/m2 (£7.03/m2 inc VAT)

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​Cellecta FIBREfon Micro 50 roll is sound absorbing wool roll made from a unique polyester fibre which provides very high sound absorption properties. Despite its slim design it provides the same acoustic performance as traditional mineral wool products that is twice as thick, which means ..

Guide Price: £50.61 (£60.73 inc VAT)

£5.86/m2 (£7.03/m2 inc VAT)

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30mm Cellecta Fibrefon HiGYP 30TM Acoustic Wall Lining Board

30mm Cellecta Fibrefon HiGYP 30TM Acoustic Wall Lining Board

1200x2400mm - 2.88m2  Delivery Time: 3 - 5 days

Guide Price: £77.81 (£93.37 inc VAT)

£27.02/m2 (£32.42/m2 inc VAT)

Cellecta Fibrefon HiGYP 30TM is especially designed wall board with excellent acoustic performance due to its high density composure contributing to significant reduction in airborne sound transmitted through different surfaces including new build or existing metal framed, timber stud or masonry wal..

Guide Price: £77.81 (£93.37 inc VAT)

£27.02/m2 (£32.42/m2 inc VAT)

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