The National Building Code of Canada provides architects, engineers and builders with a simple calculation method for assigning fire-resistance ratings to wood-frame and steel-frame wall, floor and roof-ceiling assemblies. It was originally devised in the early 1960s and is commonly known as the Component Additive Method (CAM). A collaborative industry-government research program was carried out recently at the National Research Council Canada to develop new fire-resistance ratings for gypsum-board protected walls.
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机译：《加拿大国家建筑规范》为建筑师，工程师和建筑商提供了一种简单的计算方法，可为木结构和钢结构的墙壁，地板和屋顶天花板组件分配耐火等级。它最初是在1960年代初设计的，通常被称为组分添加法（CAM）。最近，加拿大国家研究委员会（National Research Council Canada）实施了一项行业政府合作研究计划，以开发新的石膏板防护墙的耐火等级。
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