Minimum order £500.00 Ex-VAT - Delivery Vehicle Access: 28 ton curtain-sided lorry off-load requirement.

    Shopping Basket

Jabfloor EPS70 - Under-floor Insulation from Jablite

Jabfloor EPS70 Expanded Polystyrene Insulation Board. .. insulation for floating; suspended; beam and block floors, and incorporation with underfloor heating

Jabfloor can be 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. The product achieves consistent thermal performance over the range of temperatures normally encountered in buildings.

Jabfloor 70 can also be used below the concrete slab in domestic solid ground-floor constructions to satisfy the Building Regulations' U-value requirements. It can be fitted between or below the joists to provide insulation to suspended timber ground floors.

Furthermore, Jablite can be used below a sand/cement screed, above either a concrete slab, precast suspended concrete floor or beam and block floor system in domestic ground-floor constructions to satisfy the Building Regulations U-value requirements. It can also be used in conjunction with underfloor heating systems to reduce downward heat loss.

Price and Availability Advisory

Presently there are no availability restrictions. Always observe the 'Star Rating' indicators to assess availability.

Product availability indicators

Excellent = Product Availability Excellent Good = Product Availability Good Fair = Product Availability Fair Poor =  Product Availability Poor Undetermined = Product Availability Undetermined
Availability relies on stock levels at closest depots and upon transport logistics to effect deliveries

Product Details

Standards & Approvals

Jabfloor 70 is supplied as EPS 70 as defined in BS EN 13163.

Jabfloor EPS70 has been assessed and approved by the British Board of Agrément for use below flooring grade chipboard on a concrete or precast ground floor; Certificate number 87/1796.


Standard size, 1200 x 2400mm. Thickness, 25, 50, 75, and 100mm - other thickness’s available to order.


The rate of heat loss through a ground floor varies with its size and shape. The thickness of insulation required to meet a given U-value will similarly depend on the size and shape of the floor.

Low thermal transmittance

110mm thickness of Jabfloor 70 will typically improve the U-value of a 50m 2 ground floor from 0.22W/m2K.

Rapid construction

No specialised trades or equipment are required

All-dry construction

The use of Jabfloor 70 with a chipboard finish provides an all-dry method of construction, saving up to one week in site time compared to a wet screed.


Jabfloor 70 is rot-proof and durable and will remain effective for the life of the building.


Jabfloor 70 with a chipboard finish provides a cost-effective solution to floor insulation.

Easy to handle

Jabfloor 70 is manufactured from expanded polystyrene (EPS), and is lightweight and easy to handle.

Jabfloor 70 and Jablo Flooring thickness requirements for a U-value of 0.22 W/m2K.

Example: Solid Ground Floor Applications - Over slab Chipboard Finish


P/A ratio

Jabfloor U-Value = 0.22 W/m 2 K (mm)

Commercial Thickness (mm)

Actual U-value (W/m 2K)
























































Typically to achieve a U-value of 0.22W/m K add 17mm to the corresponding Jabfloor 70 thickness for the required P/A value.

When considering insulation requirements, designers should refer to the detailed guidance contained in the documents supporting the national Building Regulations.

Product Installation

For buildings such as terraces or blocks of flats and apartments, the measurement should be taken over the total gross ground floor area. Concrete slab The concrete slab should have a level, evenly-tamped surface; a floated or screeded finish is not necessary. The slab should be left as long as possible after laying to allow it to dry out.

Jabfloor 70 should be loose-laid over the prepared surface all joints should be tightly butted. The boards should be cut with a sharp knife to fit accurately around services.

In most cases, the actual thickness of Jablite required according to this calculation will not correspond with the nominal thickness’s available. The next thickest nominal size should be used in order to provide a performance which betters the required U-value.

The sizing shows the required thickness of Jabfloor 70 to meet a U-value of 0.22W/m K. These values are based on a k-value (Lambda value) of 0.038W/mK for the insulation. A U-value of 0.20W/m K can typically be achieved by adding a thickness of 17mm of Jabfloor 70 to the figure shown in Table 3 for the corresponding P/A value.


Solid ground floors are not required to provide fire resistance. When properly installed, the EPS insulation is fully protected by the chipboard finish and will have no adverse effect on the fire performance of the floor. Euroclass E, flame-retardant material, is available to order.

Precast concrete floors

Where Jabfloor 70 is used in precast concrete floor, care should be taken that there is not excessive variation in level between individual 2 conjunction with a suspended units. If Jabfloor 70 spans between high points, then a levelling screed or compound should be used; the use of dry sand as a levelling medium is not satisfactory.

Damp-proof membrane

Jabfloor 70 should not be regarded as a damp-proof membrane (DPM), and a suitable DPM must be used to protect floors in contact with the ground. The membrane may be positioned either above or below the concrete slab; see Figures 9 and 10. Liquid membranes are positioned above the concrete slab.

If a liquid DPM is used, care should be taken that it is compatible with Jabfloor 70, and that it is completely dry before the insulation is laid. Where the DPM is positioned below the concrete slab, a vapour-control layer, of minimum 1000g polythene or equivalent, should be laid over the Jabfloor 70. All edges should be overlapped a minimum 150mm and taped, and the material should be turned up 100mm at the perimeter and fixed behind the skirting.

Partitions et cetera

Where masonry partitions or other heavy structures are to be built directly onto the chipboard floor, the insulation should be interrupted and a solid batten provided along the line of the partition, beneath the chipboard, to provide support. The batten should be of preservative treated timber, securely attached to the concrete slab using masonry nails or screws and plugs.


The chipboard should be positively supported at external doorways by the use of a solid batten spanning at least the width of the door. The batten should be of preservative treated timber, securely attached to the concrete slab using masonry nails or screws and plugs. At internal doorways, if the tongued-and-grooved joint of the chipboard is lost, a batten should be used to provide support as described above for external doorways.

Chipboard finish

The chipboard should be Type P5 minimum 18mm thick, with tongued-and-grooved edges, as described in BS EN 312 - Particle boards, Specification.

It is important that the recommendations given in BS EN 312 - Particle boards, Specification are followed regarding protection of the chipboard from water spillage in bathrooms, kitchens and utility areas.

Laying should proceed from one corner of the room ensuring that a 10-12mm gap is provided at the perimeter to allow for expansion. Temporary wedges should be placed in expansion gaps during laying to allow the chipboard joints to be tightened; the wedges must be removed after the adhesive has dried.

The boards should be laid with staggered cross joints, and all edges should be glued as laying proceeds using a PVA-based woodworking adhesive.

In corridors, or wherever there are long uninterrupted runs of flooring, the inclusion of a 20mm expansion gap at 10m centres is required in addition to the 10-12mm perimeter gap. A suitable solid timber batten should be installed beneath the expansion joint to provide support. The batten should be of preservative-treated timber, securely attached to the concrete slab using masonry nails or screws and plugs.


Providing the work is carried out in accordance with the relevant Byelaws or Regulations, electrical conduits, gas and water pipes can be accommodated within the thickness of the concrete slab.

If this is not possible, it is permissible to accommodate the services within the thickness of the insulation providing pipes etc are securely fixed to the slab. Jabfloor 70 should not be allowed to come into direct contact with PVC-sheathed cable, nor closer than 12mm to hot-water pipes; pipes should be haunched with a sand/cement mix or lagged using a proprietary material intended for this purpose.

Where subsequent access is required to the services, a removable panel should be provided by cutting out an appropriate area of the chipboard finish and supporting it on battens. The battens should be of preservative-treated timber, securely attached to the concrete slab using masonry nails or screws and plugs, and the chipboard screwed to the batten.

Product Information and Certification

Links to manufacturer's information. Click to download in a separate browser window.

Jablite / Jabfloor Datasheet | Jabfloor 70 BBA Certificate


  • British Board of Agrément Certificate  No. 87/1796
  • Designation Code: MW EN13162 T1.

Priced on Application:

Generally, Products are readily available

Estimates for large quantity orders can be priced on application. Please contact us to discuss such matters.

Contact us directly for further information: Telephone 0333 8000 828  - Email: Click Here:

Contact Manufacturer

Jablite Limited

Boothferry Works, Howden, East Riding of Yorkshire, DN14 7EA

Telephone: 0870 600 3666
Web sites: Jablite Insulation. | Jablite U-Value Calculator

Contact us

Insulation Online Limited

Sales Office only:39 Normandy Road, Worthing, West Sussex, BN14 7DX, UK

Telephone: 0333 8000 828


Web site: - we always deliver top quality products, competitive pricing and an efficient caring service