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Table 3.5.3.1 FIXING REQUIREMENTS FOR WALL CLADDING BOARDS, G = Galvanised fibre-cement nail Most roof constructions will be ventilated and should include air gaps in their design to allow condensation to be carried away or to dry out. The NCC specifies that a suspended floor, other than an intermediate floor in a building with more than one storey, must achieve a certain R value for the downwards direction of heat flow for the relevant climate zone. In all other cases, fixings must be hot-dipped galvanised (min. For safety reasons, minimum manufacturers specified clearances must be left around hot objects, such as flues from fires, recessed halogen downlights and their transformers. Timber wall cladding must be installed as follows: Splayed timber weatherboards must be fixed in accordance with Figure 3.5.4.1 and with a lap not less than, 30 mm for hardwood, Cypress and treated pine; and, fixed in a horizontal, vertical or diagonal direction with the overlap and groove closely fitted, where provided; and, with tongue and groove profile, fixed with tongue edge up, where they are fixed in a horizontal or diagonal direction; and, where fixed in a vertical or diagonal direction, provided with a vapour permeable sarking complying with AS/NZS 4200.1 (see Figure 3.5.4.2) installed behind boards with. Bradford's technical services team offers support to architects and specifiers looking for solutions for their projects. Bradford Supertel is a high performance insulation thats installed inside HVAC ducts for sound attenuation and thermal resistance. Sarking-type material means a material such as a reflective insulation or other flexible membrane of a type normally used for a purpose such as waterproofing, vapour management or thermal reflectance. Total R values for walls are expressed as a single figure, without up and down distinctions. Be aware that reflective foil insulation should be on the warm side of any building system. The performance of any insulation product how well it resists heat flow is know as its R value. Thermoseal Wall Wrap is a protective second skin thats wrapped around your house as its being built. Ceilings and roofs are not considered part of a buildings breathable envelope for controlling internal humidity, which must be done through fully breathable walls or a mechanical heat recovery ventilation system. If assembling non-rigid materials on site, it is wise to allow at least 25mm between layers to ensure the air gap is maintained. Using cavity fill in double brick walls provides a total R value of around R1.3 (dependent on cavity width). There must be an appropriately specified vapour-permeable moisture barrier (sarking) below the roof to carry away any condensation. Note to Figure 3.5.4.2: For fixing of diagonal wall cladding, equivalent fixing details apply. Installing high-performance products at the time of construction is a good investment, resulting in lower energy bills over the lifespan of your home. Cladding is a non-loadbearing skin or layer attached to the exterior of the walls. Fix bulk batts between battens and cover with a climate appropriate water and vapour control layer. Access the full version online. Foam boards with reflective surfaces do not perform properly if air gaps are not large enough or the reflective surfaces get dirty during construction. must be taken and the Bradford Higher R values will deliver better thermal performance. C1.9 Non-combustible building elements. Maximum nail spacing using 2.8 or 3.5 mm galvanised clouts or flat head nails. It is recommended that any sarking be classified as a Water Barrier in accordance with AS/NZS 4200.1, to provide protection against wind driven rain and water ingress. Ensure bulk insulation batts fit within the cavity without compression or gaps. This R value needs to be supplemented with additional insulation. Its a good question, especially because the Australian legal requirements have changed over the last few years. All products come with manufacturers installation requirements always refer to these first. Where the building is located within 200 m of breaking surf, fixings must be, stainless steel when fixed into timber framing members; or. Care must be taken to manage condensation risks consult the manufacturers technical information and installation guide to prevent pest entry, and ensure that all termite barriers remain fully visible. Bust the myth now with Bradford's building science team. We pay our respect to their elders past and present and extend that respect to all Aboriginal and Torres Strait Islander peoples today. Whether it's a backyard workshop, a man cave, a studio or a potting shed, you can keep your space comfortable & safe with the right insulation & vent. 3.5.4.6(a)(i) applies 'where practicable' because it is often impractical to extend the flashing 110 mm beyond the reveal; for example, where openings are positioned adjacent to a corner or where two windows are within 110 mm of each other. with a vapour permeable sarking installed behind boards, where they are fixed in a vertical or diagonal direction (see Figure 3.5.3.2). Thermal bridges reduce the effectiveness of insulation and can also lead to condensation problems. Many factors can reduce the total R value, including thermal bridging, compression of bulk insulation, dust settling on reflective insulation and the lack of a suitable air gap for reflective surfaces. Check out our FAQs. Masonry used as wall cladding, including masonry veneer, is not covered by Part 3.5.4 but is covered by Part 3.3. Download the Thermoseal Wall Wrap Brochure for more information. For example, in summer the bricks will reach peak temperature in the late afternoon, and slowly radiate that heat into the evening just when you need the house to be coolest. Australian National Life Cycle Inventory Database, Environmental Product Declaration Australasia, Environmental product declaration Australasia, Good Environmental Choice Australia (GECA), The Australian National Life Cycle Inventory Database Initiative. Fasteners must penetrate not less than 30 mm into timber frames and not less than two full screw threads through steel frames. Splayed and profiled timber weatherboards must be fixed in accordance with Table 3.5.4.1, with, one fixing at each stud or equivalent framing member for splayed timber weatherboards; and, one fixing provided at each stud or equivalent framing member for profiled timber boards not more than 130 mm wide; and, two fixings provided at each stud or equivalent framing member for profiled timber board more than 130 mm wide; and. Because any foil insulation is electrically conductive, the risk of contact with electrical cables and equipment must be considered with all installations, and measures to eliminate the risk should be followed. Wall sarking suitable for use in a non-combustible external wall is a heavy-duty wall wrap made up of a layer of woven glass fabric with aluminium foil laminate designed to provide protection against water and offer insulation properties in commercial wall applications. In the spirit of reconciliation the Australian Building Codes Board acknowledges the Traditional Custodians of country throughout Australia and their connections to land, sea and community. Compliance with this acceptable construction practice satisfies Performance Requirements P2.1.1 and P2.2.2 for wall cladding provided, 3.5.4.2 for timber cladding, including weatherboards and profiled boards; and, 3.5.4.3 for fibre-cement and hardboard wall cladding boards; and, 3.5.4.4 for fibre-cement, hardboard and plywood sheet wall cladding; and, fibre-cement sheet eaves where provided, are installed in accordance with 3.5.4.5; and, openings and penetrations in cladding are flashed in accordance with 3.5.4.6; and, the bottom surface of the cladding terminates in accordance with 3.5.4.7; and. Ensure there is sufficient space for the insulation to retain its normal thickness. Part 3.5.4 Timber and composite wall cladding, Figure 3.5.4.2 Fixing of vertical wall cladding, Figure 3.5.4.5 Weather protection of openings, Part A5 Documentation of Design and Construction, Part 3.7.2 Fire separation of external walls, Part 3.9.1 Stairway and ramp construction, Part 3.10.5 Construction in bushfire prone areas, Part 3.10.6 Attachment of decks and balconies to external walls of buildings, Part 3.10.7 Boilers, pressure vessels, heating appliances, fireplaces, chimneys and flues, NSW Part 2.6 Energy efficiency performance provisions, 1.4 Design scenarios: NCC Performance Requirements, 3.5.4.7 Clearance between cladding and ground. As well as assessing the insulation performance, you can compare the environmental benefits of different products. Note: The roof battens must be secured through all intermediate components and into the rafters with appropriate fasteners to prevent roof failure in storms or high winds. Sheets not more than 9 mm thick must be fixed using 2.8 or 3.530 mm long galvanised clouts or flat head nails spaced at. For these requirements, you should check out the Bradford Thermoseal Firespec, which you can order through Network Architectural here. Fit batts snugly and do not leave gaps around ducts and pipes. It is important to understand that the water barrier properties of a sarking and the climate zone of construction should be considered before choosing any product. Contact the manufacturer or industry association to find out more. For better insulation, a rigid foam board can be installed into the cavity between brick and wall frame, with optional foil face to the interior (for cool climates). Openings in external wall cladding exposed to the weather must be flashed with materials complying with AS/NZS 2904 and in accordance with the following: Flashings must be provided to bottom, tops and sides of openings, except as permitted by (d), and must be installed so that the flashing, extends not less than 110 mm beyond the reveals on each side of the opening where practicable; and, is attached to the window and wall framing; and. It is generally advisable to exceed these for greater comfort and energy savings. Suitable and climate appropriate materials include rigid foam boards, bulk batts between battens, and foil-faced foam boards with an air gap of at least 15mm with the foil facing inwards (these products could be vapour impermeable or vapour permeable). Bradford's technical services team offers support to architects and specifiers looking for solutions for their projects. Thermal modelling suggests that slab edges are likely to leak heat into and out of houses in all but Climate zone 1 and some sites near the northern extremity of Climate zone 2. Fixings must be positioned a minimum of 12 mm from the edge of the sheet and not less than 50 mm from the edge of all corners. An electronic copy of this Australian Standard can be purchased through the Digital Australian Standards webpage. We've been manufacturing insulation for your homes, offices and factories for over 80 years. 3.5.4.2 covers the following types of timber cladding profiles: Table 3.5.4.1 applies to both machine and hand driven nails. There are a wide range of insulation products. Thick bulk insulation batts are installed between rafters, such that there is very slight compression when installed (less than 5% of total width). Composite insulation combines bulk and reflective insulation. Wall cladding may be fixed through timber or metal battens attached to the wall frame in accordance with AS 1684.2, AS 1684.3, AS 1684.4 or NASH standard as appropriate (see fixing requirements for roof battens) so long as the minimum penetration into the wall frame is achieved. S = self embedding head or wafer head screw. Just like you, we believe in using high-quality building materials that are compliant, safe and cost-effective. Do not compress bulk insulation because this reduces its effectiveness. a pitch of less than 20 are sarked and The tight assembly of the panel leaves no space for air and thus no condensation risk, if the R value is adequate. Sorry, you need to enable JavaScript to visit this website. 3.5.4.2(c)(iv) ensures the fixing of the wall cladding does not split the wall cladding board below. Insulation isolates the thermal mass from the interior, wasting its beneficial passive heating potential. Download the Wall Wrap Research article for more information. be fixed in accordance with the following: Where structural plywood acts as combined cladding and structural bracing it must comply with Table 3.5.3.4. for 7.5 mm (minimum) thick fibre-cement comply with AS/NZS 2908.2 or ISO 8336; and, for 9.5 mm (minimum) thick hardboard comply with AS/NZS 1859.4 for exterior grade; and, be fixed in accordance with Tables 3.5.4.2a and b with, one fixing provided at each stud or equivalent framing member for wall cladding boards not more than 130 mm wide; and, two fixings provided at each stud or equivalent framing member for wall cladding boards greater than 130 mm wide; and, fixings located along the studs at not more than 100 mm centres; and, fixings located so that they do not penetrate the tip or thinner edge of the board beneath; and, for 7.5 mm (minimum) thick fibre-cement25mm; or. for steel frames 81830 mm self embedding head or wafer head screws. For lighting, the approach to insulation depends on the type of lighting you have: Take note of manufacturers installation instructions for lights that include warnings about covering them with insulation, or display the following symbol meaning Do not cover. Roof sarking is a pliable membrane (usually a thin sheet of foil lined with aluminum) that sits under your roof providing protection to your roof cavity, along with several other benefits. In air-conditioned buildings in warm tropical climates, reflective foil should be used on the outside (or warm side) of bulk insulation. Up R values describe resistance to heat flow in an upwards direction (sometimes known as winter R values). The NCC requires minimum insulation levels (total R value) for roofs, walls and floors, according to your homes location and other building features. Raked or cathedral ceilings include sloping ceilings, vaulted ceilings, and flat or skillion roofs where there is no accessible roof space. Check that local building regulations allow use of cavity fill. The method of flashing must be suitable for the framing and cladding used and any reveal for the window or door system or any architrave or finishing trims that may be installed. Where recessed lights are installed in an accessible roof space, a permanent and legible warning sign must be installed in the roof space adjacent to the access panel in a position that is visible to a person entering the space. Reflective insulation is usually shiny aluminium foil laminated onto paper or plastic and is available as sheets (sarking), concertina-type batts and multi-cell batts. Source: Adapted from AS/NZS 3000:2007 Figure 4.7 reproduced with permission from SAI Global. Suspended slab with rigid foam board installed to the underside. Step by step instructions & how-to video. AS 4040.2-1992. Its insulation ability relies on the presence of an air layer of at least 25mm next to the shiny surface. The National Construction Code (NCC) has specific requirements for sound attenuation in multi-unit dwellings which can be satisfied by providing 2 leaves of 110mm clay bricks with a cavity of 50mm between leaves and a 13mm cement render on each outside surface. However, do not insulate the inside of walls used for thermal mass. Table 3.5.3.4 MINIMUM STRUCTURAL PLYWOOD THICKNESS FOR COMBINED BRACING AND EXTERNAL CLADDING (mm), External fibre-cement sheets and linings used as eaves and soffit linings must, be fixed in accordance with Table 3.5.3.5 and Figure 3.5.3.4 using, No. Material R values refer to the insulating value of the product alone. Please try again later. Good orientation can significantly improve your comfort and reduce your heating and cooling needs. This may require innovative detailing in the roof and ceiling design. Its thermal resistance is essentially the same regardless of the direction of heat flow through it. Ceiling insulation makes a big difference to your energy bills and comfort, and it's not hard to DIY. For 12 mm plywood and 2.8 mm diameter nail. The top of the capping must slope a minimum of 5 degrees. Download the Enviroseal Wall Wrap brochure for more information. Insulation is used to stop heat inside the home from escaping in winter, and to stop heat outside the home from entering in summer. Insulation materials containing reflective foil must be kept clear of electrical wiring and fittings, and should be secured using nonconductive staples. The type and R value of insulation that is best suited to your home will depend on your climate and construction type. If your project has a 2016 Construction Site Certificate, then you require a sarking product that is suitable for use in a non-combustible external wall construction in accordance to National Construction Code (NCC) 2016, Volume 1, Building Code of Australia (BCA) Amendment 1 Section C1.9. Sheets more than 9 mm thick must be fixed with 2.8 or 3.5 mm galvanised clouts or flat head nails with a length calculated using the following formula: Minimum nail length (L) = plywood thickness + (10 x diameter of nail). Table 3.5.4.3 8 wafer head screws (for 4.5 mm and 6 mm sheets only); or. 3.4.2.2 and 3.4.2.6, NASH Standard, Australian Standard AS 3000:2018 Wiring Rules, and any other state, local or electrical authority requirements or regulations. If you are installing insulation yourself, consult the manufacturers Material safety data sheet (MSDS) and installation instructions for the product. It's part of a constant drive to improve the durability and weathertightness of homes in Australia. Fixings must be located not less than 50 mm from the edge of all corners. 81850 mm self embedding head or wafer head screws; and. Insulation is a material that slows or prevents the flow of heat. Check whether the product must be installed professionally or can be installed yourself. 8 self embedding head screws (for 6 mm sheets only). NCC 2019 - Sarking for Non-Combustible Construction. Allow clearance around hot flues, exhaust fans, appliances and fittings that penetrate the ceiling to ensure they meet the manufacturers installation instructions. Even a small gap can greatly reduce the insulating value. Solid wall with external polystyrene and render. The total R value adds together the R value of the various components of a roof, ceiling, wall or floor, including the insulation. Always check for stray wires these may be unlikely in new buildings, but are quite common in older homes. Table 3.5.3.5 TRIMMER AND FASTENER SPACINGS FOR 4.5 AND 6 mm FIBRE-CEMENT EAVES AND SOFFIT LININGS. In Climate zone 1, it should face outwards regardless of whether the building is air-conditioned or not. it helps to address the requirement within the BCA to protect the building from the entry of external moisture. Wall sarking suitable for use in a non-combustible external wall is a heavy-duty wall wrap made up of a layer of woven glass fabric with aluminium foil laminate designed to provide protection against water and offer insulation properties in commercial wall applications. Openings in external wall cladding exposed to the weather must be flashed as follows: All openings must be adequately flashed using materials that comply with AS/NZS 2904. Use a vapour control layer where there is a risk of condensation. Home Comfort Hub is your place to learn how insulation contributes to your home's energy efficiency, comfort and health. Our team of building supplies and architectural experts will be happy to help. What are the benefits and why is roof sarking important? Insulation must be installed correctly to reduce the risk of condensation. Tape up holes and the entire lengths of joins in reflective insulation using a high-quality tape with a warranty life corresponding to the insulation product lifespan. Please try again later. Bushfire Roofing Systems Design 2023 CSR Building Products Ltd ABN 55 008 631 356. Dust settling on the reflective surface of insulation greatly reduces its performance. . Slab edge insulation is often sufficient on its own, as approximately 80% of the heat loss occurs through the edge. Fixing for cappings must be compatible with the capping material. This permits you to select wall sarking options that have more of vapour permeable membrane to address condensation issues such as mould because it allows walls to breathe. Rigid board materials can be installed with air gaps of as little as 10mm, and some pre-manufactured products may have 5mm gaps. On the 1st of May 2019, all Construction Certificates approved in accordance with the NCC 2019, will have new exclusions for sarking-type materials. Avoiding gaps when installing insulation in a wall frame. For these requirements, you should check out the Bradford Thermoseal Firespec, which you can order through Network Architectural here. Sarking: A material intended to collect and discharge any water that may penetrate a building envelope A Reflective Foil Laminate (RFL) is commonly used as sarking. Its a good question, especially because the Australian legal requirements have changed over the last few years. The Provisions of this Part and those of Part 3.3 (Masonry) do not cover all of the wall cladding materials that may be used for a Class 1 or Class 10 building. As building practices have improved, and houses have become more airtight, roof spaces have also been over sealed and the risk of condensation has been exacerbated. Australian Standards and their absolute adherence are essential to ensure the protection and safety of people living and working in residential and commercial buildings . overlap by not less than 50 mm in the direction of flow; and. 81850 mm self embedding head or wafer head screws. (e)The following materials may be used wherever a, An esky in summer & a thermos in winter - push home comfort to the max without bill shock, Don't sacrifice comfort & safety in your shed or outdoor building, Dark walls, dark roofs take care with this hot industrial style, The weekend job that'll save money all year: DIY ceiling insulation, Learn more about how insulation works in your home, Fire protection for homes in bushfire zones, Acoustic and Thermal Insulation for HVAC Ducts, Access tools and help from Bradford Technical Services, An esky in summer and a thermos in winter - how to push home comfort to the max without bill shock. NCC2019 Changes - Condensation Management, Design considerations prior to sarking selection for metal roofing, Selecting the right roof sarking for your climate zone, Select the right sarking product for your roof type, Sarking selection and installation tips for metal roofs, Building Code of Australia and Sarking - understand your requirements. to be installed to the whole external wall which contains the parapet, and extend to the top and back of the parapet. for 9.5 mm (minimum) thick hardboard20 mm. Solid walls can be insulated on the inside or the outside. A gap should be provided between the sarking and the parapet capping to help control condensation. Notes to R values as used in Australia, New Zealand and Europe are metric and are different from R values used in the United States. Sarking-type materials are recommended for all framed housing. Exposed rafters with rigid foam board insulation. Additional insulation above minimum levels can further improve building performance. Call our offices today on 1300 258 789 for expert consultation and detailed inspection reports. Consult the insulation manufacturer about installation clearances. Some types of insulation should be installed by a professional, while some you can do yourself. . Typical roof and flat ceiling insulation construction detail. Download the Wall Wrap Research article for more information. Clause C1.9 (e) (vi) will state that sarking-type materials which do not exceed 1mm in thickness and have a Flammability Index not greater than 5, may be used where a non-combustible material is required in Type A and B construction. You may also find this chart useful in determining which product is best suited for your project: As of the 1st of May 2019, all Construction Certificates approved in accordance with the NCC 2019, now have new exclusions for sarking-type materials. If a sarking material is perforated or considered a Non-Water Barrier in accordance with AS4200.1, it may not be able to provide weather protection. Always refer to the product manufacturer regarding installation. for splayed timber weatherboards and profiled timber boards not more than 130 mm wide, one fixing at each stud or equivalent framing member, at not more than 650 mm centres measured along the board; and, for profiled timber boards greater than 130 mm wide, two fixings at each stud or equivalent framing member, at not more than 650 mm centres measured along the board; and. Special fixings should be used with foil-faced boards. P2.1.1 In most climates, it is appropriate to place ceiling insulation between the joists. Worried that insulation will make your home a hotbox in summer? Wall cladding materials and systems not covered by the Deemed-to-Satisfy Provisions All Bradford wall wraps and roof sarkings comply to clause C1.9 (e), however, choosing the right sarking can greatly improve weatherproofing and minimise the risk of condensation in commercial buildings. : Where provided, external fibre-cement sheets and linings used as eaves and soffit linings must, be fixed in accordance with Table 3.5.4.6 and Figure 3.5.4.4 using, No. Concrete slabs with a smooth soffit (such as after good quality formwork is removed) may need either a primer or some mechanical fixings installed first to give the expanding foam something positive to cling to. Walers & Bracing. Some additional thermal breaks may be required to prevent thermal bridging under structural members. Some current LED downlights are rated to be covered with insulation (though they may have a reduced warranted life). Step by step instructions & how-to video. How well an insulation product resists heat flow is know as its R value. In Climate zone 1 (high humidity summer, warm winter), a layer of reflective insulation (either sarking or foil batts) beneath the roof increases resistance to radiant heat. Wall cladding may be fixed through timber or metal battens attached to the wall frame in accordance with AS 1684.2, AS 1684.3, AS 1684.4 or NASH standard as appropriate (see fixing requirements for roof battens) so long as the minimum penetration into the wall frame is achieved. NCC2019 Reference Steel bracing and whalers are provided for in ground structures to transfer load that could not be provided by other means. Building codesAustralian standardsGetting it right on siteSee all Building materials & products Concrete, bricks & wallsGetting products approvedUse the right products for the jobSee all Managing your business Dealing with contractsHandling disputesManaging your employeesSee all Managing your safety Sarking must comply with AS/NZS 4200.1 and be installed behind all wall cladding where parapets are installed, with. The R value of many common wall types is insufficient for building code compliance or energy efficiency requirements and needs to be supplemented with additional insulation. Use an appropriate vapour control layer over the outside of the frame. A membrane of either heat-welded bonded poly sheet is adhered to a layer of dense closed cell rigid foam boards which are also adhered to the concrete roof slab. Older-style halogen lighting cannot be covered with insulation as it is a fire risk.