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By Philip R Heath

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Extra info for An introduction to homotopy theory via groupoids and universal constructions

Example text

E. a valley running from eaves to ridge in parts A and B, with shorter valleys in parts C and D. If one considers the hip to be an external mitre of the roof, then the valley is an internal mitre. The easiest way to consider a structural solution is to imagine one roof being wholly or partially imposed upon the other, and this is most easily illustrated in Fig. 9B where the top part of the roof can be imagined to run through undisturbed as a normal gable to gable roof, with the leg of the T imposed upon it.

1 Timber I beam. conventional glulam. However, unlike conventional plywood where alternative veneers have timber grain laid at right angles to one another, most of the products in this category have laminates parallel to one another bonded by high performance adhesives. The trade name of one such beam, Parallam, describes its construction. This particular product is of course solid, but unlike a piece of solid timber is extremely stable, and again unlike a piece of solid timber, has all of the major strength reducing features engineered out thus enabling it to develop the strength of an almost perfect piece of timber, giving an even higher performance.

F – Hip end – whereas a gable end O is a vertical closing of the roof, the hip is inclined at an angle usually to match the main roof. F1 – Hip rafter – sawn timber member at the external intersection of the roof slope (similar to a roof sloping ridge), used to support the jack rafters forming the hip (see Chapter 3, Fig. 6). G – Valley – term used to describe the intersection of two roofs creating a ‘valley’ on either side. The illustration has only one main valley, the building being L-shaped on plan.

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