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

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3.7 Floors intended to support heavy, vibrating items must be designed to take into account the recommendations given in section 9.2. 4 Practicability of installation The products are designed to be installed by a competent general builder, or a contractor, experienced with this type of product. 5 Sound insulation 5.1 Separating sub-floors, flanking elements and overlays incorporating the products must be designed and constructed to avoid direct paths for airborne sound transmission and to minimise the flanking sound transmission. Guidance is given in the following documents: England and Wales — Approved Document E and the Robust Details, Part E Resistance to the passage of sound (Jan 2005) Northern Ireland — Technical Booklets G and G1. 5.2 Laboratory tests in accordance with Appendix D of Robust Details, Part E on floating floor treatments (FFT), comprising 25 mm and 30 mm Earthwool Acoustic Floor Slab Plus in conjunction with 18 mm chipboard, achieved reduction in impact sound transmission ( Lw) values greater than 17 dB. These finishes may, therefore, be used as a FFT4 on Robust concrete separating floor details E-FC-1 and E-FC-2. 5.3 Separating floors incorporating the products in England and Wales, other than those described in section 5.2, are subject to pre-completion testing in accordance with Section 1 of Approved Document E. 5.4 New timber floors incorporating Earthwool Acoustic Floor Slab as the resilient layer will provide satisfactory impact and airborne sound insulation when constructed in accordance with: England and Wales — Approved Document E, Sections 3.94 to 3.120 – Floor Type 3 Northern Ireland — Technical Booklet G, Section 1.11 – Floor Type 3A. 5.5 Existing timber floors incorporating Earthwool Acoustic Floor Slab as the resilient layer will provide satisfactory impact and airborne sound insulation when constructed in accordance with: England and Wales — Approved Document E, Sections 4.31 to 4.34 – Floor Treatment 2 Northern Ireland — Technical Booklet G1, Section 2.6 – Floor Type 2. 6 Thermal performance 6.1 Calculations of the thermal transmittance (U value) of a floor should be carried out in accordance with BS EN ISO 6946 : 2007, BS EN ISO 13370 : 2007 and BRE report BR 443 : 2006 Conventions for U-value calculations using the declared thermal conductivity (λ 90/90) of 0.036 W·m –1 ·K –1 . 6.2 The U value of a floor will depend on the thickness of the products, the perimeter/area ratio and the floor type. Examples of U values are given in Table 2. Floor constructions incorporating the products can contribute to achieving the design U values given in Tables 3 and 4. Table 2 Floor U values (1) Floor type Perimeter/ area ratio Insulation thickness 40 mm 75 mm 100 mm Slab on ground support 0.2 0.24 0.19 0.17 0.4 — 0.25 0.21 0.6 — — 0.24 0.8 — — 0.25 Suspended timber floor 0.2 0.25 0.2 0.18 0.4 — 0.25 0.21 0.6 — — 0.23 0.8 — — 0.24 1.0 — — 0.24 (1) Excluding edge insulation for the ground-supported floor system. Table 3 Typical design U values for floors — England and Wales, and Northern Ireland Construction type U values (W·m –2 ·K –1 ) Mean for new extensions (1) 0.22 ‘Notional’ mean in SAP and SBEM and limit mean for new-build 0.25 Mean for replacement, renovated and retained floors and non domestic consequential improvements (1) 0.25 Individual limit for new-build and flexible approaches (1) 0.70 (1) Alternative or flexible approaches are given in relevant documents supporting the national Building Regulations. Page 4 of 12
Table 4 Typical design U values for floors — Scotland Construction type U values (W·m –2 ·K –1 ) ‘Notional’ mean for new dwellings in SAP and the ‘simplified’ approach: solid fuel, packages 3 and 6 other fuels, packages 1, 2, 4 and 5 Page 5 of 12 0.20 0.22 Mean for conversion of unheated buildings and stand alone buildings of less than 50 m2 0.22 Mean for extensions and alterations (1) ‘Notional’ mean for non-domestic in SBEM and limit mean for all new build and stand 0.22 alone buildings of 50 m2 or more Individual limit for; new build, new extensions, and alterations 0.25 (1) and conversions of heated buildings and stand alone buildings of less than 50 m2 0.70 (1) Alternative or flexible approaches are given in relevant documents supporting the national Building Regulations. 6.3 The product can contribute to maintaining continuity of thermal insulation at junctions between ground floors and external walls. Example junction details shown in Figure 2 will allow the use of the default psi values for Accredited Construction Details in carbon emission calculations. Detailed guidance for other junctions and on limiting heat loss by air infiltration can be found in: England and Wales — Accredited Construction Details (version 1.0) Scotland — Accredited Construction Details (Scotland) Northern Ireland — Accredited Construction Details (version 1.0). 7 Condensation Interstitial condensation 7.1 Floors will adequately limit the risk of interstitial condensation when they are designed and constructed in accordance with BS 5250 : 2002, Section 8.5 and Appendix D. Surface condensation 7.2 Floors will adequately limit the risk of surface condensation when the thermal transmittance (U value) does not exceed 0.7 W·m –2 ·K –1 at any point, and the junctions with walls are designed in accordance section 6.3. 7.3 Floors will adequately limit the risk of surface condensation when the thermal transmittance (U value) does not exceed 1.2 W·m –2 ·K –1 at any point. Guidance may be obtained from Section 8 of BS 5250 : 2002 and BRE report (BR 262 : 2002) Thermal insulation : avoiding risks. 8 Behaviour in relation to fire 8.1 The products are classified as class A1 in accordance with BS EN 13501-1 : 2002, non-combustible and do not prejudice the fire resistance properties of the floor. 8.2 When properly installed, the slabs will not add significantly to any existing fire hazard. The slabs will be contained within the floor by the overlay until the overlay itself is destroyed. Therefore, the boards will not contribute to the development stages of a fire or present a smoke or toxic hazard. 9 Floor loading 9.1 The products are suitable for occupancies defined in this Certificate when covered with a suitable floor covering and are capable of resisting a uniformly distributed load of
Page 1 and 2: Knauf Insulation Ltd P O Box 10 Sta
Page 3: Non-regulatory Information NHBC Sta
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Page 9 and 10: Bibliography BS 1282 : 1999 Wood pr
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Earthwool Acoustic Floor Slab and Earthwool ... - Knauf Insulation

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