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Unvented roofs in northern climates are prone to ice buildup, but how do you ventilate a valley or hip rafter in a cathedral ceiling? And what do you do at a skylight, where the headers block the vent chutes? A snow-country builder describes the venting methods that have worked for him at these and...
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Whole-house ventilation strategies
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Venting mechanical rooms
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Kitchen heating solutions
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Simple pressure test for ductwork
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In a perfect world, air retarders and careful insulation details would keep moisture out of the roof. But real buildings are never perfect, and venting is still the safest approach, especially in cathedral ceilings.
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If you’ve ever considered skimping on ventilation details, think again. This moisture-damaged roof system is an extreme case, but it teaches an important lesson about doing the job right the first time.
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Mechanical ventilation doesn’t have to be expensive and complicated. This simple system has dried up moisture problems for one builder.
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Q: Here in the West, we often build with exposed rafter tails. For attic roof vents, we typically drill three 1 1/2-inch holes through every other soffit block, and install ridge vents. Is this enough ventilation?
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Q: Clients have been asking us about ACQ, a new pressure-treated wood that is supposed to be "nontoxic." Does this product pose fewer hazards than CCA lumber? How does the new product perform?