High Performing Buildings - Spring 2009 - (Page 55) incident water drains to the outside. The ¾-in. ventilated space provides added protection (water is not “sandwiched” between the clapboard and the underlying structure, plus the space allows for ventilation drying). Any small amount of water that penetrates past the cladding is drained on the outside face of the insulating sheathing. Finally, any water that manages to get between the two layers of insulating sheathing Two layers of rigid insulation were installed over the top of the roof deck. Rafter tails were extended to provide a sufficient overhang. is carried down the wall on the draining housewrap. Since the windows were installed back at the face of the housewrap/board sheathing, the rain is kept away from the face of the window, further increasing the long-term durability of the window. The basement did not show any signs of ever having water leakage, but as a precaution, the interior face of the existing wall was drained at the bottom with the drainage mat that was Crown molding was installed to hide the thickness of the two layers of rigid insulation installed on the top of the existing roof deck. spring 2009 HigH Performing Buildings 55
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