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Installation - Flashings and fixings

All vertical joins, windowsills, heads and other openings should be adequately flashed. They should be fixed at least 25 mm under the cladding when covered by it.

SarkingSarking is a reflective foil laminate that is installed inside roofs. It has many benefits including weatherproofing, insulation and reduction of dust and sound. should also be fixed directly under timber cladding.

Fixings should be in accordance with manufacturers' recommendations and to best industry practice. Boards fixed horizontally must have each end protected.

If a painted finish is to be used, end joints should be sealed with a compatible mastic. Alternatively, a timber paint primer should be applied to the ends of boards before fixing.

Where cladding abuts masonry, clearance should be left or ends sealed. This is to prevent moisture from being taken up by the boards.

Diagrams showing three different ways that boards can be fitted together to make tight fitting joints. These are hairline overlap (a very small overlap), bowed into position (where the fit is so tight that the board actually bows slightly outwards) and snapped tight.
Some methods used to make tight fitting joints