Passive House Details by Donald B. Corner Jan C. Fillinger & Alison G. Kwok

Author:Donald B. Corner, Jan C. Fillinger & Alison G. Kwok
Language: eng
Format: epub
Publisher: Routledge

5.1.1 Midorihaus Prior to renovation. The expressed rafter tails, roof boards, and brackets are central to the character of the house. ESSENTIAL HABITAT ARCHITECTURE

5.1.2 A deep bed of spray-applied cellulose insulation in the attic. Ventilation at the roof peak. CHIE KAWAHARA

MIDORIHAUS

Presented in Chapter 3, this Craftsman-style house had the original roof, exposed rafter tails, and barge rafters. The ceilings were covered with asbestos-laden material, and so the decision was made to retain the existing roof and to replace the ceilings. The new gypsum board at the ceiling would serve as the airtight layer, with a thick layer of cellulose insulation added above. A significant concern was thermal bridging along the eaves due to narrowed ceiling insulation. The initial intention was to use closed-cell spray foam here, but thermal bridge analysis showed little performance improvement over cellulose. The whole-building analysis ultimately showed little performance impact from this area, and the mild climate rendered interior surface temperatures high enough to prevent condensation, mold, or mildew. In colder climates, it would have been necessary to reframe the roof with a raised heel, or to remove and replace the overhangs after encapsulating the attic with a layer of exterior insulation.

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