Tiled Roof Extension System Overview and Design Guide OCT 2015 V3 Realroof by Ultraframe Is a Tiled Roof Extension CONTENTS Solution
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Tiled Roof Extension System Overview and Design Guide OCT 2015 V3 realROOF by Ultraframe is a tiled roof extension CONTENTS solution. It is a packaged solution, off site Overview 3 manufactured and which satisfies Building Using the realROOF guide 4 Regulations. realROOF has LABC Registered Structural specification guidelines 5 - 7 Details which assist with demonstrating compliance Principles of good extension design 8 - 9 to all relevant parts of the Building Regulations. Extension styles (simple shapes, sizes and loadings) - for full range of options see p40-43 Appendix 1) 10 - 21 realROOF accommodates all popular forms of slates, tiles and Support requirements 22 - 24 metal sheet products. As it is factory pre-fabricated, it is speedy Overview 22 to install on site, saving a number of days when compared to Support Post Options 23 traditional ‘on site’ roof fabrication. The packaged solution is Spread Restraint Straps 24 based around a structural insulated roof panel product and the Product Cross Sections / detailing 25 - 26 roof structure is delivered in one ‘package’ – only fascias/soffits, Velux Window Insertion Rules 27 tile coverings and plasterboards have to be sourced locally. Thermal Performance of assemblies 28 - 29 Typical installation sequence 30 - 33 For assistance with realROOF design/specification please Building Regulation & Planning Process 34 - 35 contact the Technical Support Team on 01200 452 223 or Price List 36 email [email protected] Order Form 37 Surveying and Fit & Function / Information 38 - 39 IMPORTANT - NOTE 1 The installer is responsible for ensuring that where realROOF APPENDIX 1 is supported by means such as masonry or timber frame walls rather than realROOFs own support posts/beams, the structure Full range of style options 40 - 43 provides enough lateral support and resistance to wind uplift. Further guidance can be obtained through realROOF’s APPENDIX 2 technical documentation/guides – we strongly recommend the use of the realROOF structural support posts/beams. Additional Support Post Information 44 - 45 Ultraframe cannot accept responsibility for the overall structural stability of an extension utilising realROOF. Nor can Ultraframe APPENDIX 3 be responsible for the structural adequacy of any existing Velux Windows - Product codes 46 building work used as part of an overall project. While assistance is provided, ultimate responsibility to secure Velux Windows - which window fits into which Building Regulations and Planning permission lies with the extension style/by size 47 - 57 retail installer. APPENDIX 4 IMPORTANT - NOTE 2 Gable frame sizes 58 This guide is intended to provide indicative information and to help you understand the design principles and applicable loadings. U-Design (see across) is the final arbiter on price and APPENDIX 5 specification decisions. Typical foundation detail - with support post 59 IMPORTANT - NOTE 3 APPENDIX 6 The realROOF components have been designed and manufactured to meet the specification of each individual Cavity tray assessment / vertical DPC requirement 60 job. Any significant modifications particularly relating to the repositioning of the structural supports will invalidate the APPENDIX 7 product’s warranty and compromise the structures integrity. If adjustments are required due to site conditions please consult Component ID charts 61 - 64 Ultraframe. 2 OVERVIEW Product definition realROOF is a tiled roof extension solution. In summary, it is a packaged solution, off site manufactured for rapid assembly and compliance with relevant Building Regulations. To demonstrate compliance to Building Regulations, realROOF has been issued with LABC Registered Details. realROOF is classed as a ‘warm roof’ and gives a vaulted/loft type ceiling. There are three major elements to realROOF; 1 2 3 1. A patented box eaves beam, filled with EPS beads as used in cavity insulation - that forms the soffit structure - approx 450mm front to back depth. 2. A hidden structural aluminium framework for hips, ridge and starter bars. 3. Mechanically fixed Kingspan Unidek Aero Structural Insulated Roof Panels are attached to the box eaves and structural framework. Once it is counter battened and roofing membrane fixed (both supplied) the selected slates/tiles and battens are attached in the usual manner. (These items are not supplied - see list of what is/not supplied on page 61) Key performance criteria - The product can be designed with window frames to all elevations, full masonry walls or brick piers. realROOF can be specified with its own structural support posts. - If bi-folding doors are to be used they MUST be bottom supported NOT top hung. - The standard soffit projects approx 150mm beyond external masonry - box eaves beam is approx 450mm front to back depth. - Pitch range suits all commonly available tiles/slates/metal roof coverings – pitch range: 15° - 45°. Always check with the roof covering manufacturer on the minimum pitch for your selected tile/slate brand. U-Design - System ‘U’ values - with the 190mm Unidek Aero panels is 0.16W/m2°C U-Design is a piece of design and with the 240mm Unidek Aero panels it is 0.13W/m2°C configuration software that exclusively (240mm is used in larger projection gable style lean - to’s due to its specifies realROOF extensions. As well as additional spanning performance) visualising and pricing, upon entry of the - The system can incorporate various styles of Velux roof windows. customers postcode it checks the wind Cut outs for roof windows must be selected at point of ordering. and snow loads at the exact location to Under no circumstances can this operation be done on site. ensure realROOF comply’s with Building - The set out information in this guide is based around 300mm Regulations. cavity walls. 3 USING THE REALROOF GUIDE - WORKED EXAMPLE The only accurate way to specify realROOF is using U-Design software. Either use a licensed copy of the software or send a sketch to Ultraframe or one of its approved trade intermediaries / distributers, where the information will be input on your behalf. Worked Example A 4m x 4m* gable fronted extension with a 25 degree Marley Modern tile is proposed at the rear of a semi detached property in the small market town of Clitheroe. The homeowner wants to know if they can have Velux roof windows and what size and how many. Turn to page 12, the correct page for the style of extension (in this case Georgian) and use the chart that shows the pitch range (defined as 25° for this project) .As the project is defined as 4m x 4m, look up the loading for this size which is in Zone 2 light blue and which shows realROOF can accept a load of 1.18kN/m2 from wind and 0.6kN/m2 from snow Now check how high above sea level the location is (Google search or try www.maps-streetview.com) – in this case it’s 76m elevation above the sea level. As outlined p12 in the worked example in red above, the location is in a small town (not the country). Use figure 1 to check the wind speed at the location (in this case its 23 m/s which translates on table 1 to 0.68 kN/m²). From figure 2 check the snow load at the location (which is fig1 0.6kN/m²). fig2 Loads at postcode Max System Load System load MUST EQUAL (kN/m2) (kN/m2) or EXCEED post cope load SNOW 0.60 0.60 WIND 0.68 1.18 Both figures at the actual site are within the design parameters of the realROOF system, so it is OK to proceed with the project with no amendments. And finally, to determine the number and size of Velux roof windows that can fit into this extension, turn to page 56 and 57 to look up the vent opening sizes that can be configured p56 into each elevation. p57 If you are unable to achieve the desired size for your realROOF project please contact Ultraframe’s Technical Support Team for advice. (See p2 for contact details). 4 STRUCTURAL SPECIFICATION GUIDELINES The size limitations for the realROOF are dependent on a number of factors primarily:- • Geographic Location • Roof Finish • Supporting Structure 1. Geographic Location The location of the build will alter the imposed load on the finished structure (both wind and snow loadings will have an impact). The size of these loads can be obtained from U-design software as the roof is being specified. U-design uses historic weather datafiles which from a postcode can provide both wind and snow loadings. If you do not have access to U-design the maps will help guide you to the approximate loadings. This will not give you exact values but ones likely to be the worst case for your location. If you are unable to achieve the desired size for your realROOF project please contact Ultraframe’s Technical Support Team for advice. (See p2 for contact details). The Map in figure 1 shows the fundamental basic wind velocity, vb,map in m/s. Find your approximate location and determine windspeed. Now you need the height above sea level in metres, this could be obtained via Ordnance Survey or Google Maps. Determine if your site is town or country. Now use Table 1 Below to establish the load in kN/m2 and finally, check with figure 2 to see the snow load. Table 1 Max wind Load EC1-4-NA - q(p) kN/m2 Altitude 21.5 22 22.5 23 23.5 24 24.5 25 25.5 26 26.5 27 27.5 28 28.5 29 29.5 50 0.55 0.57 0.60 0.62 0.65 0.68 0.71 0.74 0.77 0.80 0.83 0.86 0.89 0.92 0.96 0.99 1.03 100 0.60 0.63 0.66 0.68 0.72 0.75 0.78 0.81 0.84 0.88 0.91 0.94 0.98 1.02 1.05 1.09 1.13 150 0.65 0.68 0.72 0.75 0.78 0.82 0.85 0.88 0.92 0.96 0.99 1.03 1.07 1.11 1.15 1.19 1.23 TOWN 200 0.71 0.75 0.78 0.82 0.85 0.89 0.92 0.96 1.00 1.04 1.08 1.12 1.17