我梦想中的房子将位于密歇根州的北端，俯瞰着航运通道。背面朝北，有很多窗户，我知道热量损失很严重，但这正是老板想要的。好消息是正面，街道一侧，将面对正南，可以持有大量PV。我将努力追求卓越的气密性，目标是r60天花板，r40墙壁，r30地下室墙壁和r30地下室平板下面(使用珍珠岩)。我将结合一个砖石加热器，但加热三菱高温迷你分裂。我看了那么多的墙，我希望最终确定“那一面墙”。双螺柱框架2×4 16″OC与3 1/2″之间的墙壁。我将计划使两者的承重，以适应我的大屋顶和雪荷载的要求，在另一篇文章中讨论。为了取悦老板，外面一定是砖做的!我将使用Ambrico EZ墙，一个薄(1/2″)砖粘在钢基板。 Under the panels is Greenguard DC14, a 1/4″ XPS product that has drainage channels on both sides, a low permeability to block solar driven moisture and add r1 to the wall. Under the DC14 is Tyvec covering 1/2″ structural rated fiberboard that adds r 1.3. The stud cavities are filled with R15 Roxul comfort bats the inter wall space is filled with r15 Roxul comfort bats for steel studs. The inner wall, is sheathed on it’s outer face with 1/2″ plywood and has an interior service cavity filled with Roxul r 15 bats.. The interior is 1/2″ drywall. I’ll use aligned studs for greatest condensation immunity in winter. The plywood will be carefully detailed as an air barrier and is the only moisture control layer. With a mid cavity r value of 47.83, ignoring drywall and air films. and a mid stud r value of 26.6 at 20% framing fraction, which I’ll try to beat by adopting principals of advanced framing even though I’m 16″ OC with double top plates, I calculate r 41.2 assuming pure 1 dimensional heat flow and 40.9 assuming the plywood is a constant temperature plane allowing unlimited crosswise heat flow in the plywood, like it had an aluminum foil layer. At 25 % the results are r39.83 and r38.6 And the wall is only 12 3/4″ deep including brick. The construction sequence will be a bit unconventional as the outer wall will be erected unsheathed and remain so till after the first round of air sealing testing ( which may begin with temporary ” plugs” in the windows. I’m working on details of the transition from concrete basement to wood walls trying for minimum heat loss economically. I’d like to consider the wall plan finalized so if you see that I did something dumb PLEASE speak up.