CI/SfB l l l Ym1 l (M2) l July 2008 Superior 4 in 1 insulation TIMBER FRAME SOLUTIONS GUIDE
SUPERIOR 4 IN 1 INSULATION SOLUTIONS Timber frame buildings are becoming increasingly popular amongst specifiers, designers and contractors looking for a forward thinking, cost effective and sustainable construction method. This, coupled with the rigours of modern government legislation, dictates that your insulation must perform on more than one front. Rockwool manufacture a range of 4 in 1 insulation solutions offering superior thermal, fire, acoustic and sustainable performance. Four benefits, one insulation. THERMAL Timber frame properties lose thermal energy in three ways through the building envelope, openings and ventilation (particularly unwanted cracks and gaps). Rockwool s range of thermal insulation products help target these weak spots, maintaining integrity to ensure you create an energy efficient structure. Developed to satisfy the latest thermal regulations, they also offer high durability, water repellence and easy handling and installation. Coupled with inherent fire, acoustic and sustainable performance you have the ultimate 4 in 1 solution. FIRE In-depth research has proved that the fire resistance of a timber frame building is achieved by a combination of the timber frame itself, internal lining materials and the insulation. All Rockwool insulation and firestopping products possess unrivalled inherent fire performance. Able to withstand temperatures in excess of 1000 C, they come with a CEN fire Classification: A1 and are defined as non-combustible by the UK and Ireland building regulations. When used with the appropriate timber frame and lining products, they help ensure that your structure performs in line with current fire regulations. In conjunction with superior thermal, acoustic and sustainable performance you have the ultimate 4 in 1 solution. 02
CONTENTS: Introduction 02 ACOUSTIC Modern timber frame systems possess unrivalled acoustic properties when constructed using Rockwool s range of superior insulation products. Rockwool stone wool has an open fibrous structure, which breaks up sound waves to deliver outstanding sound absorption. Separating walls and floors and internal partitions all achieve exceptional standards to ensure you meet the latest stringent regulations. Combined with inherent thermal, fire and sustainable performance you have the ultimate 4 in 1 solution. SUSTAINABLE The decision to construct in timber frame often stems from the desire to create an energy efficient, environmentally responsible building. Choosing the right materials is critical in realising this aspiration. Rockwool products are made from natural and sustainable diabase rock. They re recyclable, chemically inert, free from blowing agents and rated as having zero Ozone Depleting Potential. In addition, excellent thermal performance helps you to meet the government strategy of reducing the impact of development on carbon dioxide emissions. Combined with superior thermal, fire and acoustic performance you have the ultimate 4 in 1 solution. New Timber Frame Buildings Total Building Performance 04 THERMAL EXTERNAL ENVELOPE 06 Ground Floors 07 External Walls 10 Pitched Roofs 12 FIRE & ACOUSTIC INTERNAL CONSTRUCTION 14 Internal Partitions and Intermediate Floors 15 Separating Walls and Junctions 16 Separating Floors 18 THERMAL, FIRE & ACOUSTIC Refurbishment and Change of Use 20 Technical Information For further details visit our website at www.rockwool.co.uk or phone the Technical Hotline on 0871 222 1780 03
TOTAL BUILDING PERFORMANCE From ground level right up to the roof, using Rockwool 4 in 1 insulation in your timber frame construction enables you to satisfy the most stringent thermal, fire, acoustic and sustainable requirements. The versatility of Rockwool insulation allows you to create the building you envisage, within your budget and construction method constraints. The outstanding performance delivered by Rockwool is your assurance of the quality of the completed construction. 01 THERMAL 04 FIRE & ACOUSTIC 01/ Ground Floor Rockwool Rockfloor 04/ Internal Partitions and Intermediate Floors 02 05 02/ External Walls 05/ Separating Walls and Floors Rockwool Rockfloor Rockwool FirePro TCB Cavity Barriers 03 06 THERMAL, FIRE & ACOUSTIC 03/ Pitched Roofs Rockwool Roll Rockwool Rockfall 06/ Refurbishment and Change of Use Rockwool Rockfloor Rockwool Fire Barrier 04
Refurbishment and Change of Use 06 03 Pitched Roofs Separating Walls and Floors 05 Internal Partitions and Intermediate Floors 04 02 External Walls Ground Floor 01 05
EXTERNAL ENVELOPE The external envelope of a timber frame building essentially comprises three elements the ground floor, external walls and roof. When considering the insulation of these components, the focus is on thermal performance and in particular, the key issues which must be addressed to ensure construction meets the desired standard. KEY ISSUES Air Permeability Air permeability is a critical factor in the energy performance of a building. Improving the air tightness will have a significant and positive affect on the overall building performance. Part L of the Building Regulations requires air permeability of 10m³ / (hr.m²). Used in conjunction with other energy saving measures such as higher levels of insulation, this will assist in delivering the required carbon emissions reduction target under Part L. If an improved air tightness of 7m³ / (hr.m²) is achieved, less stringent U-values may be used with possible savings on insulation thickness. Cold Bridging Cold bridging occurs when the insulation is missing in the isolating layer of the building envelope and where insulation does not butt tight together or to the adjoining structure. This can cause condensation to form and subsequent mould growth. Importance of Fit Ensuring a perfect insulation fit is key to maintaining the thermal integrity of the external envelope. Timber containing moisture will contract as it dries out. This can result in cracks and gaps between the insulation and adjoining timber, adversely affecting air-tightness or leading to cold bridging. 06
GROUND FLOORS Ground floors in timber frame construction primarily fall into two categories ground bearing concrete and suspended timber. Ground bearing floors can be insulated above or below the concrete slab, while suspended timber floors are generally insulated between the joists. Construction and insulation methods will be determined by the designer, depending on site conditions and the required thermal performance of the floor. For further details visit our website at www.rockwool.co.uk or phone the Technical Hotline on 0871 222 1780 07
GROUND FLOORS / SUSPENDED TIMBER Suspended Timber Floor To minimise air leakage, use a compressible sealant under sole plates to external walls Flooring grade t&g chipboard on suspended timber floor joists with insulation between, supported by polypropylene netting with ventilated floor void below. Ventilated Void is a unique flexi-edged insulation slab developed specifically for framed constructions. The compressible edge of expands into voids created as timbers contract, ensuring a snug fit between the insulation and adjoining framework to maintain integrity. KEY BENEFITS Patented Flexi edge ensures accurate fit Maintains integrity and will not slump if timbers contract Excellent thermal properties Suspended Timber Floor / Example U-values supported between timber joists Suspended Timber Floor Example Floor Area 5m x 8m 12m x 10m P/A ratio. 0.450 0.400 Flexi u-value u-value thickness(mm) W/m 2 K W/m 2 K 120 0.24 0.23 140 0.21 0.20 180 0.18 0.18 Supporting mesh Ventilated airspace P10 240 / P10 250 08
GROUND FLOORS / CONCRETE GROUND BEARING Concrete Ground Bearing Floor Rockwool Rockfloor Sand cement or anhydrite screed on concrete floor slab on Rockfloor insulation on DPM on sand blinding on hardcore. Rockwool Rockfloor Rockwool Rockfloor is a rigid, non-combustible tissue faced insulation slab with high compressive strength, developed to meet current thermal regulations. In the case of a ground bearing concrete slab, it can be placed either below or above the slab and can receive a wide range of finishes. KEY BENEFITS Excellent thermal properties High compressive resistance Can be laid on slightly uneven surfaces To minimise air leakage, use a compressible sealant under sole plates to external walls To minimise cold bridging at wall/floor junctions install 30mm Rockwool Rockfloor insulation at the perimeter of the concrete floor edge Rockwool Rockfloor Concrete Ground Bearing Floor / Example U-values Rockwool Rockfloor below concrete slab or screed Example Floor Area 5m x 8m 12m x 10m P/A ratio. 0.450 0.400 Rockfloor u-value u-value thickness(mm) W/m 2 K W/m 2 K 80 0.25 0.24 115 0.20 0.20 130 0.18 0.18 E20 200 / K11 115, 125, 135, 145 / K11 215, 225, 235, 245 For further details visit our website at www.rockwool.co.uk or phone the Technical Hotline on 0871 222 1780 09
EXTERNAL WALLS Effective insulation of external walls has a significant impact on heat loss and energy consumption in timber frame buildings. is a unique flexi-edged insulation slab developed specifically for framed constructions. The compressible edge of expands into voids created as timbers contract, ensuring a snug fit between the insulation and adjoining framework, to maintain integrity. Important Note Incorporating a service void into the wall construction is the preferred option for improving air tightness and minimising damage of the vapour control layer. In all flats and apartments, two layers of plasterboard are required internally. COLD FRAME Construction 1: Cold Frame 140mm Standard timber frame cavity wall comprising external brickwork, 50mm cavity, breather membrane, 9mm OSB, insulation fully filling timber studs, vapour control layer and one layer of plasterboard. Construction 1: Cold Frame Standard timber frame cavity wall with insulation fully filling 140mm stud Breather membrane Standard tyvek Reflex Plasterboard layers 1 2 1 2 U - value W/m²K 0.28 0.27 0.25 0.25 Flexi thickness 140mm 140mm Section 10
EXTERNAL WALLS / COLD FRAME Construction 2: Cold Frame with Service Void 140mm Standard timber frame cavity wall with service void comprising external brickwork, 50mm cavity, breather membrane, 9mm OSB, insulation fully filling timber studs, vapour control layer, 25mm battened service void and two layers of plasterboard. Construction 2: Cold Frame with Service Void Timber frame cavity wall with separate 25mm battened service void and fully filling the stud Breather membrane Standard tyvek Reflex Plasterboard layers 1 2 1 2 u-value W/m 2 K u-value W/m 2 K Flexi 120mm 0.31 0.30 0.28 0.27 Flexi 140mm 0.27 0.26 0.24 0.24 Service void between battens P10 40, 210, 230 Section EXTERNAL DOOR AND WINDOW REVEALS Minimising Air Leakage and Cold Bridging at External Door and Window Reveals To minimise cold bridging and provide fire integrity fit Rockwool TCB cavity barrier around door and window reveals. Alternatively, for warm/hybrid constructions Rockwool Rock Reveal can be used as a cavity barrier 140mm Rockwool TCB cavity barrier fixed with clout nails or staples To minimise air leakage flexible sealant should be applied internally and externally to all door and window frames and sills. It is also essential to ensure that the vapour control layer and plasterboard is returned into the reveal Rockwool TCB or Rock Reveal cavity closer Plan Section P10 70 / P10 420 / F30 18 / F30 180 For further details visit our website at www.rockwool.co.uk or phone the Technical Hotline on 0871 222 1780 11
PITCHED ROOFS The roof structure is a key element of the external thermal envelope and can be insulated to create either warm or cold roof spaces. Insulating the cold roof space at horizontal ceiling level is a popular option due to the low costs involved. However, due to higher density housing, insulation is often placed within the roof pitch to create a warm roof with additional living space. COLD Cold Pitched Roof Rockwool Roll Roofing tiles on softwood timber battens on BBA approved breather membrane or roofing felt on timber rafters. 100mm Rockwool Roll fitted between the ceiling joists and 170mm Rockwool Roll laid over the ceiling joists will provide a U-value of 0.16 W/m²K. With 200mm Rockwool Roll over joists U-value will improve to 0.14 W/m²K. Rockwool Roll A medium density insulation mat, suitable for thermal insulation of roof spaces. The rolls have semi-perforated guidelines which enable accurate cutting of widths to suit joist spacings. This makes Rockwool Roll highly effective in limiting air permeability and cold bridging. 170mm Rockwool Roll over ceiling joists 100mm Rockwool Roll between joists Proprietary eaves ventilator To minimise cold bridging ensure the roof insulation overlaps the wall plate without impeding air flow Rockwool TCB cavity barrier KEY BENEFITS Multi-application product Higher density provides excellent fit Easy to cut to 400mm and 600mm ctrs Excellent thermal and acoustic properties P10 120 / P10 130 12
PITCHED ROOFS / WARM Warm Pitched Roof - Room in Roof Rockwool Rockfall Roofing tiles on softwood timber battens on BBA approved breather membrane on counter battens on Rockwool Rockfall Overlay board on timber rafters. board is friction fitted between the rafters, underdrawn with a vapour control membrane and plasterboard. Rockwool Rockfall Overlay board laid staggered pattern along roof Rockfall - U-values Rockwool Rockfall requires the use of both the Overlay and Flexi to achieve stated U-value. fully filling depth of rafter VCL U-value overlay board Flexi W/m 2 K thickness thickness 0.20 50mm 140mm 0.16 60mm 200mm Rockwool TCB cavity barrier Rockwool Rockfall Rockwool Rockfall has been specifically developed for warm roof applications where insulation is required at rafter level to create a habitable warm roof space. The system consists of Rockwool High Density Overlay board fitted over the rafters and fitted between the rafters. As well as minimising thermal bridging Rockwool Rockfall is totally fire safe and provides an effective acoustic barrier against external noise pollution. KEY BENEFITS No ventilation of roof space required A breathable and vapour permeable system Reduces risk of condensation to roof timbers Excellent thermal and acoustic properties Reduces external noise ingress K11 695 For further details visit our website at www.rockwool.co.uk or phone the Technical Hotline on 0871 222 1780 13
INTERNAL CONSTRUCTION The internal construction of a timber frame building gives specific regard to the internal walls and floors, including their interface with the external envelope. Internal walls and floors fall under two distinct categories. Internal partitions and intermediate floors are those within the same dwelling or living space (for example between rooms in the same dwelling or flat) while separating walls and floors refers to those dividing different dwellings (for example between semi-detached houses or flats in the same building). The Building Regulations Part E in England and Wales now stipulate a minimum performance requirement for acoustic insulation in both internal walls and in floors, particularly separating, where controlling noise pollution is a key issue. Similarly, there are stringent regulations governing the effective fire performance of these elements. Rockwool offer a wide range of products that can play a major part in ensuring compliance with both acoustic and fire regulations. KEY ISSUES Minimising Flanking Transmissions Flanking sound is transmitted indirectly via paths such as service penetrations, windows, external walls and internal corridors. It is imperative that this is considered at the design stage. Specifiers should be aware that, in terms of acoustics, laboratory performance levels are difficult to achieve on site. The specified construction detailing should eliminate, or at least minimise, any downgrading of the acoustic performance. This can be achieved by gap filling, joint sealing, cavity closing and continuity of insulation to prevent sound transmission through critical junctions. Design and Workmanship When considering acoustic performance, it is of fundamental importance that good design and installation practice is maintained at all times. Crucially, all measures to eliminate or minimise flanking sound transmission should be considered at the design stage. Similarly, the builder should ensure the use of appropriate products and adherence to approved installation techniques. Fire Performance Fire safety requirements are based on life safety, means of escape, internal fire containment and the spread of fire from one building to another. It is essential that the stability and integrity of fire rated elements, particularly separating structures, is safeguarded. Construction methods and specification should ensure that, in the event of a fire, flame spread and smoke damage will be minimised and kept as close to the source as is practical. 14
INTERNAL PARTITIONS AND INTERMEDIATE FLOORS Meeting Approved Document Part E The new Approved Document E (2003 Edition) introduces, for the first time, performance criteria for internal walls and floors (those within the same dwelling). This is based on laboratory rating (Rw) for which a minimum value for airborne sound insulation of Rw 40dB is required. 100mm between floor joists 50mm between studs 40dB Internal Timber Partition The Rockwool guidance specification to achieve Rw 40dB consists of 63x38mm timber studs at 600mm ctrs with 50mm Rockwool Flexi between the studs and one layer of 12.5mm plasterboard of 11kg/m 2 mass per unit area each side (N.B. This provides 30 mins fire resistance). 40dB Timber Joist Internal Floor The Rockwool guidance specification to achieve Rw 40dB consists of standard 18mm t&g flooring grade chipboard (mass per unit area 12.4kg/m 2 ), timber joists at 400mm ctrs with 100mm between the joists and one layer of 12.5mm plasterboard (mass per unit area 8kg/m 2 ) underneath. KEY BENEFITS Meets Approved Part E minimum sound performance level Only requires 63mm deep timber studs Delivers a reduced wall thickness KEY BENEFITS Allows use of standard 12.5mm plasterboard ceiling Standard 18mm chipboard flooring Reduced floor weight Unlike roll products, can be fitted from below P10 230 P10 240 For further details visit our website at www.rockwool.co.uk or phone the Technical Hotline on 0871 222 1780 15
SEPARATING WALLS AND JUNCTIONS 60mm between each frame Timber Separating Wall Robust details Reference E-WT-1 To consist of two independent timber stud frames with a minimum 50mm gap between and a minimum of 240mm between inner faces of wall linings, to consist of two or more layers of gypsum based plasterboard (total nominal mass per unit area to be 22kg/m 2 ). Fit a minimum 60mm to both frames. Part E England and Wales: Separating Walls New build performance requirement: Airborne Sound DnTw + Ctr = 45dB (or greater). P10 40 / P10 210 / P10 230 is a unique flexi-edged insulation slab developed specifically for framed constructions and offers excellent acoustic properties. The compressible edge maintains acoustic integrity by ensuring a snug fit between the insulation and supporting studs. Rockwool Firepro TCB Cavity Barriers Firepro TCB Cavity Barriers comprise a strip of Rockwool encapsulated in a protective polyethylene sleeve. The TCB range has been specifically designed and tested to reduce the risk of fire spread in timber framed constructions. Key Benefits Patented Flexi edge ensures accurate fit Maintains acoustic integrity and will not slump if timber contracts Excellent acoustic properties Key Benefits Meets UK and Ireland building regulations Maintenance free Water repellent Easy handling and fitting Fire tested and assessed by accredited third party Provides up to 60 minutes fire integrity and insulation Backed by fire test information 16
SEPARATING WALLS AND JUNCTIONS External Wall / Separating Wall Flanking and Firestopping Detail located within the separating wall and external wall studs with Rockwool TCB cavity barriers fitted vertically at wall junctions and horizontally at separating floor junctions. External wall to receive two layers of plasterboard (each min. 10kg/m 2 ) where there is a separating floor above or below. Pitched Roof Separating Wall Junction Room in Roof The separating wall lining in the roof space is to consist of two or more layers of gypsum plasterboard (min 22kg/m 2 both sides) with all joints staggered. The separating wall is to continue to the underside of the roof structure with junction between filled with a minimum of 300mm wide. between rafters Over separating walls fit 30mm Rockwool RWA45 slab between tiling battens Rockwool TCB cavity barriers compression fitted between outer leaf and timber frame. Rockwool TCBs meet the generic requirement of Part E Robust Details, requiring the use of cavity closers to reduce flanking transmission along external masonry / separating cavity walls 60mm Rockwool Flexi Tile batten space Separating wall 60mm Rockwool Flexi Junctions between separating walls and roofs should be firestopped to the underside of the tiling to prevent flame spread between dwellings. In addition a cavity barrier should be provided within boxed eaves. Rockwool Timber Frame Wired Mat can be fixed to both sides of the rafter and carefully cut to shape to fully seal the boxed eaves Seal all plasterboard joints with tape or caulk with Rockwool Acoustic Sealant 60mm insulation is required in the separating wall section above the ceiling where there is a room in the roof Seal all plasterboard joints with tape or caulk with Rockwool Acoustic Sealant Plan Section Rockwool TCB Cavity Barrier at floor junctions P10 70 & 420 / P10 40, 210, 230 P10 40, 70, 210, 230, 240, 250, 420 / K10 695 / K12 250 For further details visit our website at www.rockwool.co.uk or phone the Technical Hotline on 0871 222 1780 17
SEPARATING FLOORS Rockwool Rockfloor Rockwool Rockfloor is a rigid, non-combustible tissue faced insulation slab with high compressive strength. It has been developed to help ensure you meet the current stringent acoustic regulations. Key Benefits Excellent acoustic properties High compressive resistance Designed for use below most floor finishes Can be laid on slightly uneven surfaces Part E England and Wales: Separating Floors New build performance requirement: Airborne Sound DnTw + Ctr = 45dB (or greater) Impact Sound LnTw = 62dB (or less). Important Note Rockwool Rockfloor of thickness 50mm can be recessed to receive services, providing a minimum thickness of 20mm Rockfloor is maintained between the services and the sub-floor deck. To ensure accurate recess cutting, a Rockwool Shark tool should be used. Construction 1: Platform Floor (Pre-completion testing required) Construction 2: Platform Floor with Recessed Downlighters (Pre-completion testing required) Airborne: R w 54dB (R w 66-12 C tr ) Impact: L nw 54dB Lab test report: L03 272 & 273 50mm Rockwool Rockfloor Airborne: R w 53dB (R w 65-12 C tr ) Impact: L nw 54dB Lab test report: L03 274 & 275 50mm Rockwool Rockfloor 100mm between joists 18mm t&g flooring grade chipboard on 15mm gypsum based plasterboard (13kg/m 2 ) on 50mm Rockwool Rockfloor resilient layer on 15mm OSB on 200x50mm timber joists at 400mm ctrs with 100mm between joists, 16mm minimum resilient bars fixed at 400mm ctrs perpendicular to joist span with ceiling finish of 2 layers of 15mm gypsum based plasterboard (26kg/m 2 ). 100mm between joists Floor as Construction 1 (Platform Floor) with ceiling finish of 2 layers of 15mm gypsum based plasterboard (26kg/m 2 ) with Tenmat FF 109 Downlighter covers and Aspect lighting downlights (1 per 1.8m 2 ). P10 240, 250 & 420 / K11 215, 225 & 235 / K20 150 & 160 P10 240, 250 & 420 / K11 215, 225 & 235 / K20 150 & 160 18
SEPARATING FLOORS External Wall / Separating Floor Junction Robust Detail E-FT-1 Floating floor treatment for E-FT-1 to consist of 18mm (minimum) t&g flooring board on gypsum based board (nominal 13.5kg/m 2 ) on FFT-1 resilient composite deep battens a minimum of 70mm deep (resilient layer at top or bottom) and 25mm Rockwool Acoustic slab between the battens, ensuring any services do not penetrate the resilient layer. Separating Wall / Separating Floor Junction Robust Detail E-FT-1 Ceiling treatment consists of 16mm deep (minimum) resilient bars fixed to joist at 400mm ctrs perpendicular to joist span with two layers of gypsum based board composed of one layer of 19mm (nominal 13.5kg/m 2 ) fixed to bars with 32mm screws and one layer of 12.5mm (nominal 10kg/m 2 ) fixed with 42mm screws. To avoid flanking transmission ensure ceiling boards have staggered joints, service cables are sealed with flexible sealant, and screws do not penetrate joists. 140mm Flexi 60mm Flexi in each frame 5mm (minimum) resilient isolating strip Wall finish Two layers of gypsum based plasterboard fixed both sides, of nominal mass per unit area 22kg/m², laid with staggered joints 5mm (minimum) resilient isolating strip Close length of cavity with Rockwool TCB cavity closers Rockwool Acoustic Slab 25mm Rockwool Acoustic Slab 100mm Flexi 100mm Flexi 240mm (minimum) deep timber I joists 240mm (minimum) deep timber I joists with 100mm between the joists Close length of cavity with Rockwool TCB cavity closers at floor junctions Seal all plasterboard joints with tape or caulk with Rockwool Acoustic Sealant Seal all plasterboard joints with tape or caulk with Rockwool Acoustic Sealant P10 70 & 420 / P10 40, 210, 230 P10 40, 210, 230, 240, 250 / K10 695 / K12 250 Important Note To reduce flanking noise, floors should be isolated from the perimeter walls. It is crucial that the floating layer and base floor are not bridged by services or fixings that penetrate the resilient layer. A minimum 5mm gap should be maintained between the floating layer and skirtings, with gaps sealed using Rockwool Acoustic Sealant. In addition, all ceiling perimeters should be sealed with tape or Rockwool Acoustic Sealant. For further details visit our website at www.rockwool.co.uk or phone the Technical Hotline on 0871 222 1780 19
REFURBISHMENT AND CHANGE OF USE When considering any refurbishment work or conversions to existing properties in order to create more space, there are a number of important issues that need to be taken into account. Current building regulations stipulate certain performance standards that need to be adhered to and it is important that these standards are achieved throughout the specification and construction stages. Acoustic performance, fire safety and thermal efficiency are all of paramount importance. Because the extent of conversion work will vary with each project, the developer is advised to consult with the local building control officer prior to commencement of any works on site. KEY ISSUES Fire and Acoustics Refer to Internal Construction Thermal Refer to External Envelope 20
REFURBISHMENT AND CHANGE OF USE Acoustic Upgrade of Existing Internal Masonry Wall to create Separating Wall (Pre-completion testing required) When upgrading acoustic performance of an existing internal masonry wall to form separating wall (also for room in roof method), a minimum airborne sound reduction of DnTw + Ctr of 43dB (or greater) is required. Adopt following construction: 100mm (min) existing solid masonry wall plastered on both faces, independent timber or steel studs (minimum 10mm gap to be maintained between frame and existing wall), 50mm between studs, two layers of plasterboard min 20 kg/m 2 (approx = to 2 x 15mm wallboard or 2 x 12.5mm layers of acoustic plasterboard). 10mm gap between frame and wall 50mm Flexi between timbers is a unique flexi-edged insulation slab developed specifically for framed constructions. The compressible edge ensures a snug fit between the insulation and adjoining framework, maintaining integrity. Key Benefits Section Patented Flexi edge ensures accurate fit Maintains integrity and will not slump if timbers contract Excellent thermal and acoustic properties CEN fire Classification: A1 Rated as non-combustible in UK and Ireland building regulations Fully sustainable, recyclable product Easy handling and fitting To avoiding flanking transmission, seal perimeter edges of new plasterboard with tape or Rockwool Acoustic Sealant. IMPORTANT NOTE If existing masonry wall is not plastered or less than 100mm thick then wall treatment should be applied to both sides. K10 35, 115, 125, 155, 165 / K12 330 For further details visit our website at www.rockwool.co.uk or phone the Technical Hotline on 0871 222 1780 21
REFURBISHMENT AND CHANGE OF USE One Hour Compartmentation in Roof Space (Non-Habitable) Rockwool Fire Barrier Fire barrier systems are required to prevent flame, heat and smoke spread within buildings. Specification of the correct products and installation methods are paramount in preventing fire spread to adjacent areas (Rockwool Fire Barriers also provide the added benefit of contributing to a reduction in flanking noise). Fill space between battens with 300mm wide x 30mm thick RWA45 New External Dormer Walls Cold Frame Dormers are often constructed to offer additional space when creating a room in the roof. Dormer walls constructed in tile/slate hanging, treated tiling battens, breather membrane, 12mm OSB sheathing, insulation fully filling timber studs, vapour control layer and one layer of plasterboard RW Clamping Plates fixed with No.10 wood screws at 450mm ctrs between studs only thickness (mm) u-value W/m 2 K 60mm Rockwool Fire Barrier tightly butt jointed and stitched 120mm 0.35 140mm 0.29 Rockwool Fire Barrier 35mm thick timber trussed rafter Rockwool Fire Barriers are capable of achieving both integrity and insulation protection periods from 15 to 120 minutes. Key Benefits No bolts required Standard no. 10 wood screws for timber Fixings for clamping plate extended to 450mm Speed of installation increased Costs of installation reduced See page 21 for upgrading existing wall construction. 50mm Flexi between timbers Important Note When fixing Rockwool Fire Barrier to timber (for example trussed rafters) with a thickness of 35-49mm, one layer of 60mm Rockwool Fire barrier must be fixed either side to achieve one hour integrity. For timber with a thickness of 50mm or greater, the thickness of the fire barrier can be reduced to 50mm, with no loss of performance. K10 82, K12 330 22
REFURBISHMENT AND CHANGE OF USE Existing Timber Floor Upgraded to One Hour Fire Resistance Remove existing floor finish and lay 25mm diameter wire mesh over existing ceiling, stapled to sides of joists. Lay 100mm between joists, supported by wire mesh. Floor to receive new floor finish either 18mm t&g chipboard or square edged board with a layer of 3mm hard board Existing floor joists minimum size 195x45mm at 400 ctrs 100mm Flexi Existing lath and plaster ceiling may be retained if in good order. Boards with a layer of 3mm hardboard above or below P10 240, 250 Existing Timber Floor Upgraded to Separating Floor status (Pre-completion testing required) Airborne D ntw + C tr = 43dB (or greater) Impact L ntw = 64dB (or less) Floor to consist of a minimum two layers of board material spot bonded together with joints staggered to provide minimum total mass 25kg/m 2. 25mm (minimum), Rockwool Rockfloor resilient layer laid on existing floor deck and 100mm to be laid between floor joists. Existing ceiling should be upgraded to 20kg/m 2 (N.B. If existing ceiling is lath and plaster it should be retained providing it satisfies Part B Fire Safety. If in doubt underdraw existing ceiling layer in an additional layer of 12.5mm plasterboard screwed into joists). Rockwool Rockfloor Rockwool Rockfloor is a rigid, non-combustible tissue faced insulation slab with high compressive strength. It has been developed to help ensure you meet the current stringent acoustic regulations. Key Benefits Excellent acoustic properties High compressive resistance Designed for use below most floor finishes Can be laid on slightly uneven surfaces Minimum 25mm Rockfloor 100mm Flexi P10 240, 250, 420 / K11 215, 225, 235 / K20 150, 160 For further details visit our website at www.rockwool.co.uk or phone the Technical Hotline on 0871 222 1780 23
Rockwool Limited: Pencoed, Bridgend, South Wales CF35 6NY T: 01656 862621 F: 01656 862302 W: www.rockwool.co.uk FOR FURTHER DETAILS AND TECHNICAL INFORMATION VISIT: www.rockwool.co.uk or call 0871 222 1780 Printed on recycled paper. 2008 EDITION.