to achieve R15, you will need R20+ insulation between studsMass: Concrete Wall, e.g. Table gives a layout of the insulation values before and after the new code.However, I think this study is optimistic. RTUs/boilers sold are already quite high efficiency. Not significant cost<1% increase in cost.Makes sense, because many of the items asked for in the code are already in effect. Joint venture between Stantec and BTY (QS). Based on a study commissioned by Office of Housing and Construction Standards.
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