Jabfloor 70 Floor insulation
Jabfloor 70 can be used below the concrete slab in domestic
solid ground-floor constructions to satisfy the Building Regulations'
U-value requirements
Jabfloor 70 can be fitted between or below the joists to
provide insulation to suspended timber ground floors.
Jabfloor 70 can also 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.
Product Details
Type
Jabfloor 70 is supplied as EPS 70 as defined in BS EN 13163.
Flame retardant additive material is available to order.
Dimensions
Standard size, 1200 x 2400mm. Thickness, 25, 50, 75, and
100mm - other thicknesses available to order.
U-Values
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.
Permanent
Jabfloor 70 is rot-proof and durable and will remain
effective for the life of the building.
Cost-effective
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.
Approvals
Jabfloor 70 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.
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=0.22 W/m 2 K (mm) |
Commercial
Thickness
(mm) |
Actual
U-value
(W/m 2K) |
| |
0.15 |
22 |
25 |
0.22 |
| |
0.2 |
47 |
50 |
0.22 |
| |
0.25 |
66 |
75 |
0.21 |
| |
0.3 |
79 |
100 |
0.2 |
| |
0.4 |
93 |
100 |
0.21 |
| |
0.5 |
103 |
120 |
0.2 |
| |
0.6 |
111 |
120 |
0.21 |
| |
0.7 |
117 |
120 |
0.22 |
| |
0.8 |
121 |
130 |
0.21 |
| |
0.9 |
123 |
130 |
0.22 |
| |
1.0 |
126 |
130 |
0.22 |
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.
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
thicknesses 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.
Fire
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.
Doorways
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.
See Figure 13. 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.
Services
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.
Manufacturer
Vencel Resil, Infinity House, Anderson Way, Belvedere, Kent, DA17 6BG
Tel: 020 8320 9100 - Fax: 020 8320 9110 - Email: technical@vencel.co.uk
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Page last updated
January 19, 2010