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Introduce both pieces of the gusset into the lower collector groove
(1 + 2) and push together (3).
Push down the upright metal side until flush with roofing.
Fix individual metal side sheets onto the battens with clout nails.
Insert metal sheets into the lower groove and align with the upper
edge of the upper batten. Starting from the bottom to the top,
mount metal sheets onto each neighbouring row of tiles with an
overlap.
Cover each metal sheet with a tile.
Fit in lower metal sheets for roof covering.
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