Uploaded March 2025 | Updated September 2026, 1 hour ago

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In this Q&A, we address concerns about masonry sealers (specifically silanes/siloxanes), we discuss the realities of complicated existing building conditions and how insulating isn't always possible to do safely. We discuss how to design a flat roof using rigid Rockwool insulation and vapor variable membranes, and we finish up with a critique of the construction practices of modern-day Japanese construction.

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0:00 Introduction
0:25 Masonry Sealer Concerns (silanes/siloxanes)
4:18 Insulating Heritage Homes
7:27 Venting Post Frame Roofs
9:20 Flat Roof with Rockwool & SVR
12:52 Construction Quality Issues in Japan
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