Cork Products

Cork is harvested from the Cork Oak (Quercus suber) on a nine-year (or more) cycle and is therefore considered to be an environmentally-friendly material. For conversion into boards, typically used for roof insulation, cork granules are expanded, then formed under heat and pressure into blocks using the natural resin within the cork. The blocks are trimmed to standard thicknesses or to a taper to produce falls for flat roofs (Fig. 13.2). For increased thermal insulation properties, the cork may be bonded to closed-cell

Fig. 13.2 Cork insulation to falls for flat roofs

polyurethane or polyisocyanurate foam. In this case the laminate should be laid with the cork uppermost. The overall thickness of the insulation required will be dependent on the structural substrate material and the target thermal properties of the roof. Cork products are unaffected by the application of hot bitumen in flat roofing systems. (The thermal conductivity of corkboard is 0.042 W/m K.)

0 0

Post a comment