Exterior Cladding

October 2001

The lower two thirds of the gridshell structure is to be clad. The cladding consists of a reinforced polythene membrane, a multi-layer composite insulation material, a breathable paper membrane and timber cladding consisting of Western Red Cedar boards dimensions 160mmx25mm screwed to the horizontal gridshell laths.

The following picture shows the different materials; from top to bottom.

claddingBreathable paper membrane (green)

 

Composite insulation comprising

-metallised reinforced polythene membrane

-fleece (white)

-metallised foil – four layers

-foamed plastic (pink) three layers

-fleece (white)

-metallised reinforced polythene membrane

Reinforced polythene membrane

 

The first layer is close boarded, each board has two machined slots that should inhibit lateral movement of moisture and act as a drain for any moisture that penetrates; the second layer is centred over the joins in the first layer.

cladding

cladding

The slots were machined on the side of the board that was furthest from the heart of the tree, in this way any distortion occurring as the timber seasons should create a concave surface on the side with the slots, forcing moisture away from the join between two boards.

cladding

Cladding completed November 12th 2001

vertical glazing