Fixed Cassette aluminium rainscreen system

Part 1: Aluminium cassette

Aluminium trays, polyester powder-coated in any RAL colour or anodised. At the horizontal joint the upper cassette’s drip lip runs in front of the lower one’s upstand: a drained and ventilated labyrinth, so no insulation shows from the front.

2 to 4 mm aluminium; 48 mm deep, down to 20 mm depending on the bracket size. Size can be customised as per design requirement, up to 1300 × 3800 mm

Part 2: Face-fixed, powder-coated screws

Self-drilling screws with washers, powder-coated to the panel colour. In each vertical joint one screw goes through both cassettes’ flanges into the rail. The cut-away takes those cassettes off, so the close-up shows the screws on the finished wall.

5.5 mm screws in 6 mm holes; screws at 600 mm centres maximum, holes at 300 mm vertical centres

Part 3: Aluminium angle rail

Vertical aluminium angles on the brackets, one at every vertical joint: each cassette’s wide flange lies on the angle, and the neighbour’s narrow flange over it.

60 × 40 × 3 mm aluminium, mill finish

Part 4: Express FS bracket

Our own Express FS helping-hand brackets, on their thermal pads in the channels, carry the rails and set the cavity. Each rail has one fixed point on a double bracket; the other rows are sliding points on single brackets, so the rail can move with temperature. Aluminium as standard; they can also be made in stainless steel.

Single EFS-1 at sliding points: 75 mm high, the rail screwed through its 2 slotted holes. Double EFD-1 at the fixed point: the rail screwed through its 4 round holes

Part 5: Bracket fixings

Self-drilling screws fix each bracket’s wall leg to its channel, and the rail to the bracket: through the slotted holes at sliding points, through the round holes at the fixed point.

Into the channel: 2 screws through a single bracket, 4 through a double. Into the rail: 2 through the single’s slotted holes, 4 through the double’s round holes

Part 6: Rainscreen insulation

Mineral wool slabs between the channels and over them, behind the drained and ventilated cavity.

Combined thickness, depending on the U-value requirement

Part 7: Horizontal galvanised channel

Galvanised steel C channels across the studs at each bracket row, fixed through the board, so the rails can follow the panel module rather than the studs.

104 × 40 × 2 mm at sliding points (the 75 mm single bracket), 154 × 40 × 2 mm at fixed points (the double bracket); the size follows the bracket

Part 8: Breather membrane

Self-adhesive, on the outer face of the sheathing board.

Part 9: Sheathing board

Fixed to the outer face of the studs.

12.5 mm

Part 10: MET-PRO SFS stud

Our galvanised steel studs, the frame of the wall.

1.2 mm studs at up to 600 mm centres