TIMBER FRAME HOUSING SOLUTIONS

Transcription

1 TIMBER FRAME HOUSING SOLUTIONS Complete range of acoustic and thermal insulation for timber frame housing isover.co.uk

2 Introduction The timber frame market continues to grow within the UK. Key drivers behind this growth include a shortened build programme, decreased risk of delays, faster weathertight envelope, improved airtightness, as well as reductions to site waste and storage requirements. As with other off-site manufacturing techniques, timber frame construction also helps mitigate issues with on-site skills shortages. Isover offers a wide range of insulation and airtightness solutions that will enhance the performance of a timber frame building and improve the comfort and wellbeing of those living in it. isover.co.uk

3 Contents Benefits Explained, Thermal, Airtightness, Non Combustible 4 Building Regulations England, Wales & Scotland 6 External Envelope Pitched Roof - Joist Level 8 Pitched Roof - Rafter Level 9 External Walls 0 Ground Floor Internal Envelope Internal Walls Internal Floors Separating Walls 4 Separating Floors 5

4 Unwanted noise can travel within a building via airborne transmission or impact transmission. To optimise acoustic comfort for inhabitants, careful consideration is needed in the design stage to identify likely sources of internal noise and how these could transfer within the home and between adjoining properties. Often this requires specifying building details which go above and beyond the minimum acoustic insulation requirements of the Building Regulations (England and Wales - Part E 00 & Scotland - Section 5). However this due diligence in terms of acoustic comfort will lead to the specification of wall and floor constructions which are better aligned to the needs of inhabitants, providing them with the flexibility to live life the way they want: Being noisy when they want without disturbing family or neighbours Enjoying peace and quiet to relax or work whilst those living in the house or next door carry on with their lives Isover s specialist glass wool acoustic insulation is specified extensively throughout the UK to improve the acoustic comfort of homeowners and their adjoining neighbours. When installed within appropriate building systems, it reduces airborne sound transmission through internal or separating walls and provides an effective way to reduce noise transmission through floors. Thermal Appropriate specification and installation of insulation will help keep buildings warm in winter and cool in summer, slowing heat transfer by convection, conduction and radiation. As well as delivering savings on homeowners energy bills, at a national level insulation is one of the most cost effective methods of cutting energy usage and helping to meet ambitious targets on carbon emissions. Isover s specialist insulation ranges for walls, roofs and floors are designed to improve the thermal efficiency of the building, reduce energy usage and help ensure compliance with Building Regulations (England & Wales Part LA and Scotland - Section 6 Energy.) This brochure details solutions which can help achieve a range of U-values. Further guidance is also available through our Technical Advice Centre (Tel: ). isover.co.uk

5 Airtightness Airtightness refers to the amount of air that can escape or enter a building uncontrolled through unwanted gaps, cracks or holes within the building fabric. When warm air leaks out and is replaced with cold air, it has a huge effect on the thermal performance of buildings and on the comfort of the inhabitants. The Vario XtraSafe system provides a whole house airtightness solution to improve overall thermal performance and exceed the requirements of Building Regulations Part LA.** The Vario XtraSafe system will help prevent unintended air exchanges, keeping warm air in and cold air out. Correctly installed, Vario XtraSafe can also help meet Passivhaus standards relating to air changes per hour i.e. n50. Non Combustible All unfaced Isover glass wool insulation is classed as non combustible by UK building regulations and achieves a Euroclass A fire rating.* *Frame Façade Slab is a faced product which achieves an A rating. **Part L A of the building regulations sets out a minimum standard for airtightness for new dwellings (to be tested via a Blower Door Test ) and requires properties to include airtightness measures to meet or achieve less than 0m³/(m².hr)@50Pa* 5

6 Building Regulations The diagrams below detail the performance requirements stipulated by UK building regulations for thermal and acoustic applications in a new build property. For thermal performance, the limiting fabric parameters (minimum level of thermal performance) are stated. For acoustic applications, the performance level which will ensure compliance is detailed. The Applications section of the brochure provides further details on how Isover insulation can help achieve compliance throughout the property. 6

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8 Pitched Roof - Joist Level Detail Isover insulation between joists Isover insulation cross laid over joists.5mm Gyproc WallBoard Thermal Non combustible UK Building Regulations Country Minimum standards for thermal U-values (W/m K) England 0. Scotland 0.5 Wales 0.5 Table of performance U-value achieved (W/m K) Between joists Over joists Thickness (mm) Thickness (mm) 0.4 Spacesaver/ Spacesaver Lite 00 Spacesaver/ Spacesaver Lite Spacesaver Plus 00 Spacesaver Plus 00 (50+50) 0.08 Spacesaver Plus 00 Spacesaver Plus 400 (00+00) The table above shows a selection of system details. For additional options, or for further guidance, please contact our Technical Advice Centre on

9 Pitched Roof - Rafter Level Detail Tiled or slated roof on tiling battens 4 Breathable membrane 4 Isover insulation between the rafters Recommended: Vapour control layer 5 5 Board Lining (thermal laminate not shown) Thermal Non combustible UK Building Regulations Country Minimum standards for thermal U-values (W/m K) England 0. Scotland 0.5 Wales 0.5 Table of performance between rafters Thermal laminate below rafters U-value W/m K* 5mm Metac 5mm Gyproc ThermaLine PIR 0.9 5mm Metac 6mm Gyproc ThermaLine PIR mm Metac 5mm Gyproc ThermaLine PIR mm Metac 6mm Gyproc ThermaLine PIR mm Metac 6mm Gyproc ThermaLine PIR 0. 00mm Metac 78mm Gyproc ThermaLine PIR 0. * Based on 50mm wide rafters at 600mm centres. The table above shows a selection of system details. For additional options, or for further guidance, please contact our Technical Advice Centre on isover.co.uk 9

10 External Walls Detail 4 External brick Clear cavity Isover insulation outside frame Sheathing board with breathing membrane applied to exterior side 5 Isover insulation 5 between studs Recommended: Vapour contol layer x.5mm Gyproc Wallboard 4 6 Thermal Non combustible UK Building Regulations Country Minimum standards for thermal U-values (W/m K) England 0.0 Scotland 0. Wales 0. Table of performance U-value achieved (W/m K)* Stud depth (mm) between studs outside frame Board lining Timber Frame Roll/Batt 5 N/A Timber Frame Roll/Batt Timber Frame Batt 4 Timber Frame Roll/Batt Frame Façade Slab 50mm x.5mm Gyproc Wallboard For additional options, or for further guidance, please contact our Technical Advice Centre on *Calculations assume a brick outer leaf 0

11 Ground Floor Detail Timber walking surface 00mm Spacesaver between joists (supported with netting below) Thermal Non combustible UK Building Regulations Country Minimum standards for thermal U-values (W/m K) England 0.5 Scotland 0.8 Wales 0.8 Table of performance The thermal performance of a ground floor is influenced by the floor s calculated P/A ratio (perimeter divided by area). The table below details guidance on U-values achievable with different P/A ratios. P/A ratio between joists* 00mm Spacesaver (W/m K) Joists assumed to be 50mm wide at 450mm centres. For further guidance, please contact our Technical Advice Centre on *Supported with netting below isover.co.uk

12 Internal Walls Detail Board lining - see table below Isover Partition Roll (APR 00) between studs Timber studs 4 Board lining - see table below 4 Non combustible UK Building Regulations Country Minimum standards for sound insulation db (Rw) England 40 Scotland 40 Wales 40 The above table details the current building regulations for acoustic insulation in internal walls. However, optimising acoustic comfort for inhabitants will often require going above the minimum requirements. Table of performance Partition performance db (Rw) Partition thickness (mm) Stud type within stud Board lining Timber Stud * 6mmx8mm timber stud 6mmx8mm timber stud 75mmx8mm timber stud APR 00 65mm APR 00 50mm APR 00 50mm x.5mm Gyproc Wallboard x 5mm Gyproc Wallboard x.5mm Gyproc SoundBloc 59 57* 75mmx8mm timber stud APR 00 50mm x.5mm Gyproc SoundBloc The table above shows a selection of system details. For additional options, or for further guidance, please contact our Technical Advice Centre on * 56dB and 59dB timber stud partitions use Resilient Bars to isolate the plasterboard from the stud.

13 Internal Floors Detail Timber joist floor with wood based flooring minimum 5kg/m 00mm Isover Partition Roll (APR 00).5mm Gyproc WallBoard TEN Non combustible UK Building Regulations Country Minimum standards for sound insulation db (Rw) England 40 Scotland 4 Wales 40 The above detail is consistent with Part E Internal floor type C. Table of performance Partition performance db (Rw) between joists Board lining 40 APR 00 00mm.5mm Gyproc Wallboard 4 APR 00 00mm x.5mm Gyproc Wallboard The table above shows a selection of system details. For additional options, or for further guidance, please contact our Technical Advice Centre on isover.co.uk

14 Separating Walls Detail or more layers of gypsum-based board (total nominal mass per unit area kg/m ), both sides with all joints staggered Isover Timber Frame Batt 40 between studs Timber Party Wall Roll 50mm Thermal Non combustible UK Building Regulations Country Minimum standards for thermal U-values (W/m K) Minimum standards for sound insulation db (DnTw + Ctr) Minimum standards for sound insulation db (LnTw) England Scotland Wales Table of performance - England/Wales England/ Wales Timber Party Wall E-WT- performance (DnTw + Ctr db) 45 within stud Isover Timber Frame Batt 40 90mm in cavity Timber Party Wall Roll 50mm Minimum cavity width 50 Board Lining See detail above Zero u-value YES () Table of performance - Scotland Scotland Timber Party Wall V-WT- performance (DnTw + Ctr db) 56 within stud Isover Timber Frame Batt 40 90mm in cavity Timber Party Wall Roll 50mm Minimum cavity width 50 Board Lining See detail above Zero u-value YES () The table above shows a typical Robust detail for this application. For further guidance, please contact our Technical Advice Centre on () When combined with effective edge sealing 4

15 Separating Floors Detail a Floating floor a 5mm Isover APR 00 b 60mm Isover APR 00 a 5mm (min) timber I-joists b 4 5 0mm (min) solid timber joists at maximum 400mm centres 00mm Isover APR 00 Ceiling treatment 4 5 a Non combustible UK Building Regulations Country England 45 () Minimum standards for sound insulation db (DnTw + Ctr) Minimum standards for sound insulation db (LnTw) 4 b b Scotland 56 () 5 Wales 45 () () Maximum impact sound transmission of 6 LnTw db also required for separating floors () Maximum impact sound transmission of 56 LnTw db also required for separating floors Table of performance Floor type performance (DnTw + Ctr db) performance (DnTw db) between I-joists between floating floor battens E-FT- (England and Wales) 45 APR 00 00mm APR 00 5mm B (Scotland) 56 APR 00 00mm APR 00 5mm Floor type performance (DnTw + Ctr db) performance (DnTw db) between standard joists between floating floor battens E-FT- (England and Wales) 45 APR 00 00mm APR 00 60mm A (Scotland) 56 APR 00 00mm APR 00 60mm isover.co.uk 5

16 Isover Whitehouse Industrial Estate, Runcorn, Cheshire WA7 DP Customer Service Tel: isovercustomerservice@saint-gobain.com Technical Advice Centre Tel: isover.enquiries@saint-gobain.com isover.co.uk Published date: January 09 Document reference: IS-BRO-TBR-90 Isover reserves the right to revise product specifications without notice. The information in this document was correct to the best of our knowledge at the time of publication. It is the user s responsibility to ensure that it remains current prior to use. The information in this document is for guidance only and should not be read in isolation. Users should read and familiarise themselves with all the information contained in this document and ensure that they are fully conversant with the products and systems being used, before subsequent specification or installation. For a comprehensive and up to date library of information, visit the Isover website. Saint-Gobain Isover UK Limited registered in England. Company registered number Registered Office Address; Saint-Gobain House, Binley Business Park, Coventry, CV TT