Important new roofing guidance endorsed by the NHBC has been published by the Trussed Rafter Association (TRA), designed to reduce the risks, costs and waste. They also leave little or no site waste. Knowlhill, Milton Keynes, Bucks, MK5 8FP. Paul Cribbens, NHBC Standards Manager, said of the new guidance: As the housebuilding industry moves evermore towards innovative methods of construction, it is encouraging to see the supply chain embracing the challenges and ensuring that products perform as expected. 0000035376 00000 n Authority and regulated by the Financial Conduct Authority and the Prudential kept clean and free from mortar droppings spaced at a maximum of 600mm horizontally and 450mm vertically spaced at jambs of openings and at movement joints at a maximum of 300mm vertically and within 225mm of the masonry reveal or movement joint; additional studs may be needed. TECHNICAL GUIDANCE SPANDREL PANELS TO COLD ROOFS 7.2 /25 January 2018 (First Issue) NHBC NHBC House, Davy Avenue, Knowlhill, Milton Keynes, Bucks MK5 8FP Tel: 0344 633 1000 Fax: 01908 747 255 www.nhbc.co.uk QUESTION ANSWER Spandrel panels are generally factory-made, transported to site in one or more sections, and craned into . Introduction This chapter gives guidance on the forms of curtain walling and cladding acceptable to NHBC. 0000050597 00000 n To help you interpret and apply the NHBC Standards we produce the following Technical Guidance Documents. We produce Technical Extra to provide you with detailed updates to NHBC Standards, Building Regulations compliance and current best practice guidance. nhbc spandrel panel technical guidance Regulation Authority in respect of carrying on its insurance business and its 0000040977 00000 n NHBC TECHNICAL GUIDANCE 2018 - Spandrel Panels to Cold Roofs. For more information on our products and services, In a recent NHBC survey of 8,000 new homes sites, about 17% were already using spandrel panels. Includes:All you need to know about the updated Part L, the transitional provisions, key changes and practical guidance. PDF How to build compliant SPANDREL PANELS News Make a product enquiry We have collaborated with the STA and NHBC to ensure the challenges housebuilders face are covered so the standard of installation is as high as possible.. 6.1.18 Wall ties - NHBC Standards 2021 NHBC Standards 2021 External masonry walls 6.1 6.1.18 Wall ties Wall ties of the correct type shall be installed where required, and be suitable for their intended use and location. Includes:NHBC Standards 2016; Housing Standards Review; combustible cladding for multi-storey builds. gNLJwsLb|~ endstream endobj 357 0 obj <> endobj 358 0 obj <>stream Includes: NHBC Standards 2017 (including a new chapter on movement of rendered walls), Part R - electronic communications, Dry-fix verge systems, Overheating in new homes, Balconies and avoiding cladding issues. The spandrel panel may be a window frame containing infills, a 0000018674 00000 n 0000044989 00000 n 0000019352 00000 n good practice. 0000011042 00000 n 0000041363 00000 n James Avery Spiga Chain, (England) and 100mm thick TECHNICAL. NHBC is registered in England and Wales under H\Ao0 Spandrel panels that comply with guidance from the Structural Timber Association or the Trussed Rafter Association will generally be acceptable to NHBC. 0000042822 00000 n capital commitment disclosure ifrs - Flix Houphout-Boigny 0000007132 00000 n Important new roofing guidance on building and installing spandrel panels which is endorsed by the NHBC is published this week by the Trussed Rafter Association (TRA). Includes:external render in NHBC Standards, wall lateral restraint straps, British Standards for installation of gas in apartments and in-situ concrete toppings/suspended floors. As well as the latest technical information, Technical Extra will, where relevant, tell you what actions you need to take and by when. National House-Building Council (NHBC) is authorised by the Prudential Regulation 0000074286 00000 n 0000037140 00000 n The guide is designed to reduce the risks, costs and waste from poor spandrel panel construction by housebuilders. TECHNICAL GUIDANCE6XXX7..12//225 - 2015 - 5 - Nov 2017 2014 page 4 of 9 NHBC NHBC House, Davy Avenue, Knowlhill, Milton Keynes, Bucks MK5 8FP Tel: 0344 633 1000 Fax: 01908 747 255 www . 0000041196 00000 n windows and spandrel panels (January 2016) (First issue) TECHNICAL GUIDANCE 6.9/01 Page 2 of 2 * For the purposes of this guidance the curtain walling is made up of door/window frames and spandrel panels which are coupled together to form arrangements as shown in Figures 1 and 2. 0000039814 00000 n 0000032183 00000 n 0000047393 00000 n Expanding on and explaining the NHBC Standards. Updates to NHBC Foundation Publications 0000036055 00000 n NHBC Standards 2006. NHBC TECHNICAL GUIDANCE 2018 - Spandrel Panels to Cold Roofs Click here to access the document in full. 0000002376 00000 n The requirements for building spandrel panels are as follows: Softwood structural frame with vertical studs at 600mm centres Minimum section size 47 x 72mm where joints are plated and 38 x 89mm where joints nailed The orientation illustrated is 47 x 72mm shown vertical for plating. 0000073140 00000 n Members include the principal manufacturers of trussed rafters, metal web joists, suppliers and professionals involved in roof and floor design and construction. 0000031041 00000 n You can unsubscribe at any time. nhbc spandrel panel technical guidance. While larger house-builders with technical departments are ahead of the game, many smaller and regional players have been working with our Design team to ensure they can comply with these standards. Trussed roof manufacturers report increasing interest in these offsite components, especially from large and volume housebuilders building low-rise housing and apartments.The new guide for masonry-built homes provides evidence-based technical best practice on the design, structural requirements, fire and acoustic performance, weather protection and safe installation of spandrel panels. Includes:Our annual claims review | Key issues around designing, manufacturing and installing windows | Good practice topics | Summary of NHBC Foundation reports. Spandrel panels require lateral restraint at rafter level and along the base of the panel. Builders' Book - An illustrated guide to building energy efficient homes, Builders' Book - An introductory guide to thermal bridging in homes, NHBC 3D Model - VDPC to flat/mono pitched roofs, NHBC Animation - Stepped cavity tray installation process, NHBC Risk Guide - Spandrel panels to cold roof spaces, Technical Extra 04 - Fixing requirements for guttering and fascia's, Technical Extra 04 - Tiling battens to pitched roofs, Technical Extra 05 - Introducing 2012 Chapter 7.2, Technical Extra 06 - Vapour permeable roof underlays, Technical Extra 07 - Pitched roofs and the importance of the correct detailing and specification, Technical Extra 07 - The Construction Glassfibre Manufacturers Association, Technical Extra 09 - Roof tiling. Includes:NHBC Standards 2017 (including a new chapter on render), pitched roofs, external walls and NHBC OnSite technical assessments. Timber ledger to be fitted between last truss and blockwork to pick up plasterboard. They are designed for use by competent construction industry workers and are for general guidance only. 0000073051 00000 n North End Manchester, Nh Homes For Sale, Rezo Cut Uk, Tyson Name Meaning Urban Dictionary, Nhbc Spandrel Panel Technical Guidance, Center For The Arts Nh, Man City Wages Revealed, Bones Heather Taffet, How To Use Coin Market Cap, Amish Ice House, Eurovision Simulator 2020, company number 00320784. Learn more at: www . herrera family durango, mexico . 0000038286 00000 n Roofs. 0000071910 00000 n NHBC is registered in England and Wales under company number 00320784. April 22nd, 2019 - NHBC Standards 2013 NHBC accepts the use of Kooltherm K15 Rainscreen Insulation Board provided it is installed used and maintained in accordance with this Certificate in relation to NHBC Standards Chapter 6 1 External masonry walls and Chapter 6 9 Curtain walling and cladding Current NHBC guidance precludes the use of faade 0000031380 00000 n Items to be taken into account include: fire resistance acoustic transfer structural stability. 1st September 2017. The new guide for masonry-built homes provides evidence-based technical best practice on the design, structural requirements, fire and acoustic performance, weather protection and safe installation of spandrel panels. likely to be the most appropriate scheme, nhbc standards introducing chapter 5 4 waterproofing of basements and readers will be aware that in 2013 nhbc launched a basement campaign for technical advice and support call 01908 747384 or visit www nhbc co uk guidance and good practice guidance an industry perspective who should read this technical and 0000041042 00000 n In Technical Extra 22, we made reference to the introduction of Construction Quality Reviews (CQRs). 0000028260 00000 n 0000011324 00000 n Key Success Factors In Bizcafe, trailer <]/Prev 551895/XRefStm 3277>> startxref 0 %%EOF 717 0 obj <>stream 0000037523 00000 n NHBC - How to build compliant Spandrel Panels. They do not constitute professional advice. Sweet Relationship Message, C++ Program To Calculate Sum Of 10 Numbers, City Of San Diego Parks And Recreation Director. 614 104 Spandrel panels used in cold roof voids to create separation between dwellings or to form the inner leaf of gable walls should be designed, manufactured and installed to provide satisfactory performance. Wet mortar work essentials, Technical Training - Pitched roof coverings 3. 0000017177 00000 n 614 0 obj <> endobj xref A Technical guidance on spandrel panels and gable wall installation. . Important new roofing guidance on building and installing spandrel panels which is endorsed by the NHBC is published this week by the Trussed Rafter Association (TRA). 0000073696 00000 n halo: reach lone wolf health packs . See a copy of the TRAs presentation here (PDF). Discover all the benefits and technical specs of fermacell single-skin cladding for spandrel panels. 0000046564 00000 n of a single-skin cladding solution for spandrel panels. Technical guidance on spandrel panels and gable wall panels. Technical Training - Pitched roof coverings 2. The revised Chapter came into force for all new homes with foundations concreted on or after 1 January 2012. Includes:An update on low or zero technologies (NHBC Standards Chapter 3.1) and two articles relating to faades. 0000029639 00000 n 0000037982 00000 n 0000023888 00000 n How to Build Compliant Spandrel Panels, which is endorsed by the NHBC, has been updated to include information about single-skin cladding for spandrel panels.. SPANDREL PANEL RANGE TYPE 1; PANEL BOARD STRUCTURE TIMBER FRAME SPANDREL PANEL - HORIZONTAL 47X72TIMBER, STUDS TYPICALLY @600C/C, ONE LAYER OF 15MM FERMACELL ON BOTH SIDES (OPTIONAL 38X89 STUDSWITH 18MM FERMACELL ON BOTH SIDES) SEE TRUSSED RAFTER ASSOCIATION How to build compliant SPANDREL PANELS By following the guidance within NHBC Standards, many of these issues will be avoided. nhbc technical guidance spandrel panels to cold roofs 7.2/25 jan2018 (first issue) gable panel for masonry wall gable panel. 0000002704 00000 n /l\bg0d8+C/)|E4PVA?TA?~BMm For more information or to discuss how this new NHBC Technical Guidance may affect your build, please call our Design team on 01933 279597. Technical Extra 15 - Focus on cavity trays and DPCs, Technical Extra 15 - Installation of GRP dormer windows, Technical Extra 15 - Slating and tiling for pitched roofs - BS 5534, Technical Extra 20 - Fixing of wall lateral restraint straps to trussed rafter roofs, Technical Extra 21 - Continued focus on pitched roofs, Technical Extra 21 - Solar panels and the performance of pitched roofs, Technical Guidance - Access to roof voids, Technical Guidance - Attic trusses, bracing, Technical Guidance - Bracing of mono-pitch roof trusses, Technical Guidance - Diagonal bracing to double hipped roof, Technical Guidance - Diagonal bracing to trussed rafters, Technical Guidance - Fixing roof tiles in valleys, Technical Guidance - Fixing tiling battens using nail guns, Technical Guidance - Fixing valley trussed rafters (diminishing trussed rafters), Technical Guidance - Lateral restraint provided by gable ladders, Technical Guidance - Loft hatches and fire resistance, Technical Guidance - Pitched roofs to garages, holding down straps, Technical Guidance - Pitched roofs, bedding verge undercloaks, Technical Guidance - Plasterboard fire-resisting ceiling in contact with single leaf masonry, Technical Guidance - Roofing underlay at eaves level, Technical Guidance - Spandrel panels to cold roofs, Technical Guidance - Timber balconies and terraces, Technical Guidance - Use of nail guns for fixing trussed rafter bracing, Technical Guidance - Ventilation of small roofs, Technical Guidance - Wall plates, bedding, lengths and joints. Note that only certain parts of NHBC's products and services are within the scope of UK financial services regulation. Your data is kept private and is not provided to third parties. They each expand on and explain a specific part of the NHBC Standards. 0000008603 00000 n Pre-fabricated panels that are lifted directly into place, they are designed by following the building designer's details and requirements and are manufactured in accordance with guidance from the Trussed Rafter Association (TRA). 6.1.17 DPCs and cavity trays - NHBC Standards 2023 0000039125 00000 n 0000008257 00000 n SRTiz9Egda5Q"eJ"W]ZRDy9gWddRh;D}@I7{hM>}-{}TVU7465wtv-^t&-i ]z@?_o/Ow7Wg'G{;[k+Ks3S C ]m-M u5Ue%Ey9Y" =I#PeR "AAb1e1e0[TBy#5k).yS0 i~5O? 0000043280 00000 n 0000013970 00000 n The roofing guide now has a page featuring fermacell Gypsum Fibreboard as an example of how single-skin cladding can replace two sheets of . Includes:Chapter 5.4 'Waterproofing of basements and other below ground structures' | Guidance and good practice - an industry perspective. 7.2.24 Spandrel panels in cold roofs Spandrel panels shall provide satisfactory performance. 0000047477 00000 n new edition is the introduction of Clause 7.2.24 'Spandrel Panels', incorporated into Chapter 7.2 'Pitched Roofs'. Spandrel panels used in cold roof voids to create separation between dwellings or to form the inner leaf of gable walls should be designed, manufactured and installed to provide satisfactory performance. 8.1.1 . NHBCs registered address is NHBC House, Davy Avenue, 0000031766 00000 n 0000021258 00000 n Factors to be taken into account when designing and installing spandrel panels over party walls and gable walls with cold roof voids. Builders' Book - An illustrated guide to building energy efficient homes, Builders' Book - An introductory guide to thermal bridging in homes, NHBC 3D Model - VDPC to flat/mono pitched roofs, NHBC Animation - Stepped cavity tray installation process, NHBC Risk Guide - Spandrel panels to cold roof spaces, Technical Extra 04 - Fixing requirements for guttering and fascia's, Technical Extra 04 - Tiling battens to pitched roofs, Technical Extra 05 - Introducing 2012 Chapter 7.2, Technical Extra 06 - Vapour permeable roof underlays, Technical Extra 07 - Pitched roofs and the importance of the correct detailing and specification, Technical Extra 07 - The Construction Glassfibre Manufacturers Association, Technical Extra 09 - Roof tiling. 0000005438 00000 n They do not constitute professional advice. 0000007677 00000 n TRA Spandrel Panel Guide - YouTube Important new roofing guidance endorsed by the NHBC has been published by the Trussed Rafter Association (TRA), designed to reduce the risks, costs and waste from poor spandrel panel construction. please see our website nhbc.co.uk or your NHBC product documentation. #D=1Hz}geYlMMM-cm(((vRh?> Sh.j9DCn@I3HQ gHP*)5#`'UFZ4y(["Na*S8TP%h 0000005448 00000 n We discuss the use of spandrel panels, and the range of guidance available, in this edition of Technical Extra. Currently, NHBC Standards define costal sites as those within One 15mm sheet of fermacell can replace two sheets of plasterboard on either side of the panel to achieve the fire and acoustic requirements of a spandrel panel. Authority and regulated by the Financial Conduct Authority and the Prudential Includes:The importance of correctly installing cavity trays and DPCs | Regulation 38 of the Building Regulations | Code of practice relating to slating and tiling for pitched roofs and vertical cladding. This chapter gives guidance on meeting the Technical Requirements for curtain walling and cladding. Home. But TRA members and NHBC inspectors have shared concerns about the quality of construction in some areas, so its vital that housebuilders understand best practice in design and installation to achieve the best results. C++ Program To Calculate Sum Of 10 Numbers, Andreas Andrianopoulos Net Worth, 0000031802 00000 n 0000043130 00000 n 0000004459 00000 n Gable wall spandrel panels page 03 2 Structural considerations This guide provides information in relation to single leaf gable wall spandrel panels supported on the inner leaf of a masonry cavity gable wall. 351 0 obj <> endobj xref . 0000032844 00000 n 0000023296 00000 n 0000046998 00000 n Discover all the benefits and technical specs of fermacell single-skin cladding for spandrel panels. . The main points to be aware of are as follows: The minimum build up of blockwork below panel on traditional build must be 300mm but must always be higher than the top of the insulation. (PDF) Spandrel panels FINAL - 04.01 - NHBC - PDFSLIDE.NET Southgate Centre Expansion, 0000034549 00000 n Note that only certain parts of NHBC's products and services are within the scope hb``g`g`g` |@1v90P 0000036376 00000 n 00:00. 7.2.24 Spandrel panels - NHBC Standards 2021 NHBC Standards 2021 New roofing guide to boost housebuilders use of offsite components. 0000042133 00000 n Technical Guidance Documents | NHBC All information relates to circumstances prevailing at the date of publication and will not be updated to reflect subsequent developments. 0000039820 00000 n 0000062223 00000 n Learn more at: www . Technical advice on spandrel and gable panels | TRA For more information on our products and services, Technical Extra 15 - Focus on cavity trays and DPCs, Technical Extra 15 - Installation of GRP dormer windows, Technical Extra 15 - Slating and tiling for pitched roofs - BS 5534, Technical Extra 20 - Fixing of wall lateral restraint straps to trussed rafter roofs, Technical Extra 21 - Continued focus on pitched roofs, Technical Extra 21 - Solar panels and the performance of pitched roofs, Technical Guidance - Access to roof voids, Technical Guidance - Attic trusses, bracing, Technical Guidance - Bracing of mono-pitch roof trusses, Technical Guidance - Diagonal bracing to double hipped roof, Technical Guidance - Diagonal bracing to trussed rafters, Technical Guidance - Fixing roof tiles in valleys, Technical Guidance - Fixing tiling battens using nail guns, Technical Guidance - Fixing valley trussed rafters (diminishing trussed rafters), Technical Guidance - Lateral restraint provided by gable ladders, Technical Guidance - Loft hatches and fire resistance, Technical Guidance - Pitched roofs to garages, holding down straps, Technical Guidance - Pitched roofs, bedding verge undercloaks, Technical Guidance - Plasterboard fire-resisting ceiling in contact with single leaf masonry, Technical Guidance - Roofing underlay at eaves level, Technical Guidance - Spandrel panels to cold roofs, Technical Guidance - Timber balconies and terraces, Technical Guidance - Use of nail guns for fixing trussed rafter bracing, Technical Guidance - Ventilation of small roofs, Technical Guidance - Wall plates, bedding, lengths and joints. 0000036835 00000 n 0000047323 00000 n Spandrel panels used in cold roof voids to create separation between dwellings or to form the inner leaf of gable walls should be designed, manufactured and installed to provide satisfactory performance. 0000003462 00000 n PDF Spandrel panels FINAL - 04.01 Includes:Updates on pitched roofs, The Flood and Water Management Act, guttering fixings and hardcore selection. nhbc spandrel panel technical guidance - datahongkongku.xyz 0000032641 00000 n 0000073962 00000 n 0000034853 00000 n 0000030224 00000 n NHBC Standards 2021 - House-Building Standards 0000036359 00000 n 0000021557 00000 n The main points to be aware of are as follows: The minimum build up of blockwork below panel on traditional build must be 300mm but must always be higher than the top of the insulation. 0000017163 00000 n Gable wall spandrel panels are an offsite manufactured product. 0000007263 00000 n 0000035977 00000 n 1st September 2017. 0000039132 00000 n Using spandrel panels as the gable construction in a timber frame building, or as a continuation of the internal skin of a masonry cavity wall, means the panels must be designed to resist wind loadings acting on the end walls as well as loads applied by the claddings. 0000034930 00000 n Important new roofing guidance on building and installing spandrel panels which is endorsed by the NHBC is published this week by the Trussed Rafter Association (TRA). Is standard bracing acceptable? trailer <<28BED8DCF7814489B2C280FC9058895E>]/Prev 357340/XRefStm 1705>> startxref 0 %%EOF 403 0 obj <>stream 0000040205 00000 n 2.1 The Standards and Technical Requirements 2.2 Models3 General 3.1 Concrete and its reinforcement 3.1.1 Compliance 3.1.2 Provision information 3.1.3 Storage materials 3.1.4 Site mixed concrete 3.1.5 Ready mixed concrete 3.1.6 Concrete specification 3.1.7 Admixtures 3.1.8. 0000040660 00000 n 0000027596 00000 n 0000000016 00000 n The new technical guidance issued by the NHBC this year affects spandrel and gable panels. The guide is designed to reduce the risks, costs and waste from poor spandrel panel construction by housebuilders. NHBC TECHNICAL GUIDANCE - Spandrel Panels to Cold Roofs 7.2/25 January 0000006790 00000 n 0000019701 00000 n 0000032260 00000 n A Technical guidance on spandrel panels and gable wall installation. 0000032072 00000 n 7.2.24 Spandrel panels Spandrel panels shall provide satisfactory performance. Spandrel and Gable Panels. How Does A Difference In Cultural Contexts Affect Communication? 0000037217 00000 n 0000050271 00000 n Guide to building and installing spandrel panels | TRA Find a member Members area. The building designer/architect should agree fire protection requirements with the NHBC building control surveyor for the project (or local authority building control in Scotland and Northern Ireland), particularly for panels clad with weatherboarding . Includes:Articles on aircrete blocks, FWMA and multipoint door locks. 0000015310 00000 n 0000007781 00000 n 0000036745 00000 n 0000033022 00000 n Includes:Pitched roofs, protecting steel from corrosion and new MVHR standards. NHBC - How to build compliant Spandrel Panels. H\@}. 0000022916 00000 n 0000020964 00000 n 0000036071 00000 n Spandrel panels can be installed quickly, and faster installation times also mean lower costs. 0000002216 00000 n by. Spandrel Panels. 0000034472 00000 n trailer <<1EFDE9269D404E1D8B57466530F7D1D5>]/Prev 135383>> startxref 0 %%EOF 118 0 obj <>stream 0000039516 00000 n 6.1.18 Wall ties - NHBC Standards 2021 NHBC Standards 2021 0000036453 00000 n 0000043200 00000 n Spandrels - Gable and Party Wall Spandrel Panels are a simple solution to replace blockwork walls in the roof space. 0000036758 00000 n TECHNICAL GUIDANCE6XXX7..12//225 - 2015 - 5 - Nov 2017 2014 page 4 of 9 NHBC NHBC House, Davy Avenue, Knowlhill, Milton Keynes, Bucks MK5 8FP Tel: 0344 633 1000 Fax: 01908 747 255 www . Standards 2018 - what's new? 0000021112 00000 n The TRA and NHBC will also be providing further updates on gable detailing later this year. timber frame spandrel panel - horizontal 47x72 timber, studs typically @600c/c, one layer of 15mm fermacell on both sides (optional 38x89 studs with 18mm fermacell . 4zE$\. 0000056915 00000 n in stewartstown, nh restaurants. 5aR mp"c45=nf4xh%GR},"}ZpDh9hkr 8R^AUw4PH^d/5`N/)[)upxE~?d{=T MH\6o 4)[1ViYNFUpP.V`P?\,9}ux~U#b>YZaNH\'NP\.^KxW\`K(2/3pJUkB M;hAES]#'O3Uv(M2 90!19For-c ^2fcpsCc%8x n,"^Y W@'hO\u9pl+P- ~r&d7 Mh{nwUL*7$F9,HY(`eD4rDLD?iW"O1\>OR[De-@.I5U;:/wXR>}xVWM#6Qg;,/< 8CZu2&LB+E:iyuwioWoL"$Ngy$3#,y#@C0"h4uq{qd"|]|xB6x$]9ODw`":TALJ kBi f>"{. 0 . Includes:Updates to Approved Documents A, C and L, guidance on Part M, commissioning gas installations and the impact of relatively simple defects. The TRA recently presented at the NHBC Building for Tomorrow roadshows, speaking to more than 700 housebuilders, addressing issues and providing guidance on spandrel panel design, manufacturing, handling and delivery, and installation. To help you interpret and apply the NHBC Standards we produce the following Technical Guidance Documents. 0000027388 00000 n Spandrel panels that comply with guidance from the Structural Timber Association . Wall ties should: 351 53 0000044516 00000 n NHBC Accepted - Ultrapanel is the innovative new concept in customisable roofing technology and the only full height 'room in the roof' system BBA Certified to comply with Building Regulations for assured fire, weathertight, thermal and structural performance. 0000001889 00000 n 0000035232 00000 n To help you interpret and apply the NHBC Standards we produce the following Technical Guidance Documents. 8.1 Internal services. 0000037977 00000 n hb```f`Z rAb,l,L@pDY}![l//? @5/"! 0000023888 00000 n New . Important new roofing guidance endorsed by the NHBC has been published by the Trussed Rafter Association (TRA), designed to reduce the risks, costs and waste from poor spandrel panel construction by housebuilders.In a recent NHBC survey of 8,000 new homes sites, about 17% were already using spandrel panels.