Goss's Roofing Ready Reckoner

C.N. Mindham BSc has had a wide experience in the construction industry. After working at TRADA as Eastern Regional Officer, he developed a timber engineering business to become one of the country’s largest producers of trussed rafters. He has subsequently run his own consultancy and been Managing Director of companies manufacturing trussed rafters, joinery and prefabricated timber buildings, and architectural metal work.

"The revised fifth edition of Goss's Roofing Ready Reckoner provides much needed practical guidance on the timberwork supporting tile and slate roofs. The book will be of assistance to both carpenters and tilers in providing guidance to the latest standards and new products.... It is recommended that a copy is available on site to carpenters and tilers, and kept in the van or tool bag."—Keith Roberts, RCI Technical Note Number 241, September 2016

• 1 Introduction and acknowledgements 1Acknowledgements 22 Roofing terminology 33 Calculating the size of timber members 9Strength and section size calculations 11How do we calculate the loading on the roof? 11Timber member sizing design: an example 12Cost consideration 194 Calculating the length and cutting angles of timber members: data tables 5 ◦ –75 ◦ 20The pitch 23Using the tables to cut a common rafter 23Hip jack rafters 28Hip rafters 30Valley jack rafters 32The ridge 32Purlins 345 Wall plates – strapping and gable strapping 1096 Wind bracing and openings for dormers and roof windows 111Openings for dormers and roof windows 1137 Roofing metalwork and fixings 119Nails, bolts and screws 1218 Engineered timber roofing components and prefabricated roofs 123Trussed rafters 123Spandrel panels 125Crane-on roof assemblies – trussed rafters 127Crane-on roofs – structural panels 128Crane-on roof assemblies – structural insulated panels 128Attic to room-in-the-roof conversion 1309 Roof coverings – underlay, battens and tiles 134Underlay 134Battens 138Insulation and ventilation 140Choosing the roof covering 154Building regulations – thermal performance 16210 Roof coverings – building detail drawings 179The new BS 5534:2014 179Manufacturer’s specification 180Hips, ridges, verges and valleys – traditional and new methods of construction 180Roofing putties 187Natural slates 189Concrete interlocking tiles 192Plain and peg tiles 193Asphalt shingles 198Metal tiles 201Lead substitutes 20211 Solar panels 205Planning and roof suitability 205Roof construction 206Fixing the panels 207Possible improved fixing 208Variations on panel design 21112 Sheds and outbuildings 212Permitted development 212Types of permitted building 212Design 215The structure 215The mono-pitch roof 216The dual-pitch roof 216Roof coverings 218Make your new building save money! 22013 Tools and equipment 221Obtaining information from the drawing 221To cut the roof 222Setting up the roof structure 222Roof coverings 22314 Health & safety considerations 224Access to the roof 224Basic principles 225Restoration and renovation of existing roof structures 225Newly constructed roofs 226The roof covering 226Conclusion 227Bibliography 229Index 243