Labels:chat room | reckoner | sky | window OCR: Prev XaN Water Management of the Building Envelope Design Overview When designing the building envel lope there are other considerations for instance variations in architectural massing can break-up wind -driven rain Slope horizontal surfaces to avoid ponding water Water vapor can go through solid materials like gypsum wallboard masonry and concrete unless there fully sealed vapor barrier in its way Material changes are potential prob lem Building materials expand and contract af different rates Expansion joints move by design best to place them out of the weather At windows doors and wall openings problems usually arise because water infiltration between the window and the adj acent cladding or because water you allowed to drain properly Openings around penetrations into the building shou ...
