Earthwool Acoustic Floor Slab and Earthwool ... - Knauf Insulation

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Installation 12 General 12.1 Earthwool Acoustic Floor Slab and Earthwool Acoustic Floor Slab Plus must be installed in accordance with the Certificate holder’s instructions. Installation should not commence until the building is weatherproof and wet trades complete and dried out. 12.2 All concrete floor surfaces should be smooth, level and flat to within 5 mm when measured with a two-metre straight-edge. Irregularities greater than this must be removed. Minor depressions (up to 10 mm deep) may be levelled with mortar or a thin screed. 12.3 The concrete floor over which the elements are to be laid should be left as long as possible to maximise drying out, eg the recommendations of BS 8203 : 2001 should be followed 12.4 Before installation, timber floors should be inspected thoroughly for possible defects and its condition should meet the recommendations of BS 8201 : 1987, Section 6. 12.5 Typical methods of installing the products in separating floors and ground floors are shown in Figures 1 and 2 respectively. Figure 1 Typical separating floor installation constructions Figure 2 Typical ground floor installation constructions Page 6 of 12
Timber and concrete separating floors 12.6 To ensure that paths for sound transmission through the floor assembly and the flanking elements are minimised. Each installation should be checked to ensure that: the floors are as shown in Figure 1 the timber floor incorporates a minimum of 100 mm thick mineral wool quilt in the cavity junctions between the flanking elements and the sub-floor deck are suitably sealed junctions in cavity walls flanking the floor are stopped junctions with internal non-loadbearing walls are sealed fixings or services do not bridge the acoustic floor slab ceiling comprises two layers of plasterboard with joints staggered not less than 30 mm overall thickness junctions between ceiling and wall linings are filled and taped. Concrete ground floors (see Figure 2) 12.7 Where the slabs are used over ground-supported concrete floor slabs a suitable damp-proof membrane in accordance with CP 102 : 1973, Section 11 and BS 8204-1 : 2003 or BS 8204-2 : 2003 should be laid to resist moisture from the ground. If a liquid-type damp-proof membrane is applied to the slabs, it should be of a type compatible with the boards and be allowed to dry out fully prior to installation of the slabs. 12.8 The slabs can be used on beam and block suspended concrete floors, that are the subject of a current Agrément Certificate and installed in accordance with and within the limitations imposed by that Certificate, or those designed and installed to the precast concrete and general loading codes, that have been assessed as suitable. 12.9 Where the slabs are used on hardcore bases under ground-supported concrete slabs, the hardcore must be compacted and blinded with a thin layer of sand before application of the dpm and boards. 12.10 Where a screed or concrete slab is laid over the products, vertical upstands of insulation should be provided and be of sufficient depth to fully separate the screed or slab from the wall and provide a minimum thermal resistance of 0.75 m2 ·K·W –1 . Alternatively, a suitable partial fill cavity wall insulation material can be extended below the damp-proof course level to provide edge insulation to the floor. 12.11 To limit the risk of damage from condensation and other sources of dampness, the boards and overlays should only be laid after the construction is made substantially weathertight, eg after glazing. During construction the boards must also be protected from water spillage, plaster droppings and traffic. 13 Procedure 13.1 The slabs are cut to size, as necessary and laid with closely-butted joints ensuring that all spaces are completely filled. Particle board overlay 13.2 Permanent heavy items should be supported with battens positioned on the sub-floor and recessed into the insulation. Partitions should be built directly on to the sub-floor. For further information, contact the Certificate holder’s Technical Advisory Service. 13.3 Where the slabs are laid on a dpm, a continuous vapour control layer with sealed joints of polyethylene sheet, minimum thickness 0.25 mm (1000 gauge) may be laid between the slabs and the particle board unless a condensation risk analysis to BS 5250 : 2002 shows that it is not necessary. The polyethylene sheet must have 150 mm overlaps taped at the joints and is turned up 100 mm at the walls (see Figure 2). 13.4 Tongue-and-groove particle board (type P5 or P7), or OSB/3 and OSB/4, 18 mm thick, should be laid with staggered cross-joints in accordance with DD CEN/TS 12872 : 2007. 13.5 An expansion gap between the particle board and the perimeter walls or abutments should be provided at the rate of 2 mm per metre run or a minimum of 10 mm, whichever is the greater. 13.6 Where there are long, uninterrupted lengths of floor, eg corridors, proprietary expansion joints must be installed at intervals on the basis of a 2 mm gap per metre run of particle board. 13.7 Before the slabs are interlocked, a PVA adhesive should be applied to the joints. 13.8 Once the particle board has been laid, temporary wedges are inserted between the walls and the floor to maintain tight joints until the adhesive has set. 13.9 When the wedges are removed and before the skirting boards are fixed, suitable compressible filler, eg pieces of glass wool or foam should be fitted around the perimeter of the floor between the particle board and the walls. 13.10 Where there is a likelihood of regular water spillage, eg in rooms such as kitchens, bathrooms, shower and utility rooms, additional protection should be considered, eg a continuous, flexible, vinyl sheet flooring with welded joints and cove skirting. Concrete slab overlay (ground bearing only) 13.11 Perimeter insulation of minimum thickness 25 mm should be placed vertically between edge of the slab and external wall, up to the lower edge of the skirting. The concrete slab is laid over building paper to the required thickness in accordance with BS 8000-9 : 2003 and BS 8204-1 : 2003. [see Figure 2(c)]. Page 7 of 12
Page 1 and 2: Knauf Insulation Ltd P O Box 10 Sta
Page 3 and 4: Non-regulatory Information NHBC Sta
Page 5: Table 4 Typical design U values for
Page 9 and 10: Bibliography BS 1282 : 1999 Wood pr
Page 11 and 12: BLANK PAGE Page 11 of 12

Earthwool Acoustic Floor Slab and Earthwool ... - Knauf Insulation

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