| http://www.w3.org/ns/prov#value | - ???In cavity wall construction, we like to have a continuous area for drainage and ventilation, meaning at no point is it obstructed with any element, mortar or other debris that may be getting put into the cavity,??? says Sarah B. Atkins, president of CavClear in Hudson, Wisc. ???The most common thing that would obstruct the cavity, of course, is excess mortar that gets expressed into the cavity
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