Published by City of Hamilton under Residential Construction
An explanatory note and drawing numbered A-9.13.4.3.(2)(b) and (3)(b)(i), distributed by the City of Hamilton alongside its residential construction material. The note describes the arrangement of the extraction opening so air can be extracted from the entire space between the air barrier and the ground, the negative pressure the system maintains under the floor or a heated crawl space, and the design implications where a footing layout separates part of that space. Its figure labels the radon pipe, its permanently sealed cap, the soil gas barrier and the granular fill.
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