| 摘要 |
A building panel including a permeable sheet of insulating material (10) fastened to an impermeable sheet of material (13) and having one or more conduits (16) formed in the insulating material and/or channels formed in a surface of the impermeable sheet (13) to allow fluid to escape from between the two sheets of material. The insulating material may be a foam material, and a plurality of substantially parallel, substantially straight, spaced apart channels (16) may be formed in a surface of the sheet of insulating material adjacent the impermeable sheet. The impermeable material may be a plastics material or metal. The impermeable sheet may define a plurality of ribs (14) for supporting building blocks. The two sheets may be bonded together with an adhesive.
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