New houses constructed under the control of the National House-Building Council must further conform to the requirements of the Registered House-Builder's Handbook, Volume 2 of which sets out the technical requirements for the design and
Cut 1 or 2
One each side
= Additional rafters
NB Check trimmer size for span on all openings
Cut 3 or 4
Two each side t r
Fig. 3.18b Trimming construction rules.
construction of dwellings. The reader is directed particularly to the section on carpentry, Chapter 7.2.
Chapter 8 of this book concerns itself with the many other aspects of roof construction which apply to all roof forms. The items covered are as follows:
(1) Storage and handling of timber;
(2) Preservative treatment;
(3) Wall plates and straps;
(4) Gable ends, straps and gable ladders;
(5) Water tank platforms;
(6) Ventilation of roof voids;
(7) Roof bracing;
(8) Eaves details;
(9) Trimming small openings.
This chapter has dealt with the construction of new attic roofs. Chapters 9-12 explore the possibilities, problems and solutions when converting loft spaces to form attic rooms.
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