Unroll the insulation, starting along the top of the roof.

Batten horizontally between rafters, allowing joint to be stapled and taped

Staple every 50mm (Galvanised 14mm staples)
Overlap joints 50-100mm.

Cover joint with 100mm ACTIS ISODHESIF tape
At the bottom of the roof pitch, staple the insulation directly onto the timber wall plate.

Battens (25x35mm min.) should be fixed in line using appropriate nails, ensuring that there is always a minimum air gap of 20mm between the insulation and the plasterboard