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油漆承包商鲍勃·里塔科(Bob Ritacco)和他的妻子多年来一直梦想住在一栋节能的房子里,但直到他们在两座表现不佳的房子里住了24年,他们才终于有了机会。他们买了一个条件很差的小牧场,打算把它拆掉建一个新家,直到建筑师大卫·托德说服他们做一个深层能源改造(DER)。这与Ritacco公司对零净能源(ZNE)设计的兴趣是一致的。改造包括一个由绝缘混凝土形式(icf)制成的附加部分。利塔科公司采用了建筑科学公司在寒冷气候下的保温标准。为了制造R-60的屋顶,他建造了11-1/2英寸。-深椽槽,填充密集的纤维素,然后加入4英寸。屋顶上的硬泡沫。为了创建R-40墙,他增加了1-1/2英寸。封闭孔喷淋泡沫到ICFs外部; to do so in the existing house, he filled the stud bays with dense-pack cellulose, then added 4 in. of closed-cell spray foam to the outside. Spray foam on the cinder-block walls in the basement brought the foundation walls to R-27. In the addition, underslab rigid foam created an R-20 floor. Because he did not want to lose ceiling height in the existing basement, he used only 1-1/2 in. of rigid foam on top of the slab. Heating and cooling are provided by a Mitsubishi Mr. Slim ducted air-source heat pump, and PV panels on the roof supply most of the home’s electricity. In a sidebar, Ritacco discusses the merits of being his own general contractor on the project.