In a traditionnal construction, the rafter ends are left overhanging and thus showing under the edges of the roof.
Because we are insulating over the rafters rather than under of between them, the roof will be really thick : 160mm or so on top of the rafters.
These sprocket fillets , nailed at an angle, will give this modern roof a traditional look, to satisfy the planning authorities (and us).
(refer to next post for an overview)
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