Timber Roof Joists ~ the spacing and sizes of joists is related to
the loadings and span, actual dimensions for domestic loadings can
be taken direct from recommendations in Approved Document A or
they can be calculated as shown for timber beam designs. Strutting
between joists should be used if the span exceeds 2„400 to restrict
joist movements and twisting.Typical Eaves Details ~Ref. BS EN 13707: Flexible sheets for waterproofing. Reinforced
bitumen sheets for roof waterproofing.
Definitions and characteristics.Timber Flat Roofs---1