For maximum effectiveness reflective insulation needs to remain clean and dust free as dust build up will reduce reflectivity.

Under slate roof insulation. The smartest place to install reflective foil is in walls or as sarking under the roof as it reflects radiant heat away from the interior of the building in summer. At that point a variety of insulation materials could be used to insulate the rafter bays. Protects homes and buildings against radiant heat. It is vapor permeable and air leaky.

On new build or replacement pitched roofs the ideal build up would be insulation fitted over and then between the rafters giving a big boost for airtightness image credit. The underside of the roof sheathing will dry rapidly to the exterior through the slate due to ventilation drying and diffusion. Any gaps in the foil will also reduce its performance. A strong tear resistant pliable building membrane designed for use as sarking under concrete and terracotta tile roofs.

Sarking is a pliable membrane that sits under your roof tiles like a protective second skin. Kingspan with a flat roof this issue does not arise but the u value constraint and the amount of insulation needed is just the same. It helps insulation work more efficiently and protects the things you value from storm driven rain and dust condensation and bush fire ember attack. If you create an air space under the roof sheathing boards as dana suggests there is no need to have any soffit vents or ridge vent.

A well ventilated roof space is good this stops your timbers rotting. Slate is a wonderful forgiving roofing. Then use spray foam insulation after that finish the ceiling how you would like. Install wood between the rafters maintaining a 1 gap between the wood the underside of the roof deck.

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