By C. N. Mindham
Containing over one hundred fifty outstanding and certain development drawings, Roof building and Loft Conversion covers: * minimize roofs * bolted truss roofs * trussed rafter roofs * roof home windows and dormers for lofts * trimmed openings * ventilationA significant part bargains with loft-to-attic-room conversions, giving tips on making plans systems, in addition to facing structural concerns and specifying conversion work.The 3rd variation takes account of the layout and building alterations required through BS 5268 half 2:1996 and half 3:1998. It introduces the reader to the approaching Eurocode requisites and contains up to date details at the a number of truss plate systems.The booklet will turn out helpful to architects, housebuilders, roof carpenters, development regulate officials, trussed rafter brands and scholars of establishing expertise.
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Additional info for Roof Construction and Loft Conversion 3rd Edition
13, giving spans of up to about 9 m without internal support. Clearly it can be seen that in considering a common and purlin attic roof, the design must extend all the way down to the foundations below the load bearing internal walls. Support for the purlins by internal walls within the attic area will mean support in the form of beams or walls on the lower floor, thus to a certain extent controlling the room layout. A simple example of this is indicated in Fig. 14, based on the layout of Fig. 16.
The current standard recognises a special grade for the use in punched metal nail plated trussed rafters known as TR6. BS 5268: Part 3: 1998 deals specifically with the design and fabrication of trussed rafter roof construction. BS 6399: Part 3: 1997 is the code of practice for the loads imposed on roofs, dealing with such aspects as dead and live loads as well as snow loading. BS 5250 concerns itself with the roof void ventilation and was last reviewed in 1995. BS 5534: Part 1: 1997 deals with the design of slating and tiling with the recommendations for workmanship for these roof coverings being given in BS 8000: Part 6.
The reader is directed to those British Standards referred to above, the many publications available from TRADA, and the Timber Designers' Manual by Baird and Ozelton. Roof development will undoubtedly continue. The timber sizes used in modern trussed roof construction really constitute the practical minimum possible. Structurally it may be feasible to reduce those sizes, but for reasons of achieving adequate fixings for ceiling boards and tile battens, the timber sizes cannot be reduced. It is therefore difficult to see beyond the trussed rafter, but its method of construction into the completed roof form may change.