In extremely windy areas it may be necessary to secure the cowl to the flue.
This can be done by means of self-tapping screws.
7.11 In the case of thatched or timber roofs, the space between the steel flue
and the thatch should be very well packed with fibre-glass insulation
material. Provision should also be made for a galvanised sleeve through the
thatch (refer to Fig. 6), and the top of the steel flue should extend above the
apex of the roof. A fixed steel chimney cowl should never be used. A
Jetmaster rotating cowl should be fitted.
22
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