后构建构建细节
寻找我的后框架设计详细信息的评论。MN 6B区。格式是对马丁·霍拉迪（Martin Holladay）提出的问题的回答。
Details in video form:
“Net Zero Post Frame Design Review: Rain Screen, Double Wall, Mini Split, Energy Modeling, and more!” (search on youtube)
Details in text form:
1. Where is the air barrier?
* Intello在双墙的内部
* Intello above drywall ceiling
*在胶合板平板下的EPS层之间的poly
2. How do you detail a rain screen that prevents water entry?
From eye of water droplet:
* Roof steel has 2′ overhangs
* Rain screen gap is created by strips of 6mm black corrugated polypropylene, nailed into horizontal girts, through WRB, with butyl tape to seal the holes in WRB.
* WRB is Tyvek Commercial D
*下部钢制饰边是“滴水帽”样式，在WRB下面挂上。
* Below grade is PVC sheet, shingled under drip cap, over vertical insulation.
* Further below grade, on horizontal wing insulation, is EPDM membrane.
* EPDM膜通向白天的外围排水管。
3. How do you keep rodents and insects out of the wall assembly?
* The openings on the wall steel profile will be sealed with a closure strip.
* The wall steel bottom overlaps the PVC sheet, applied over the grade board, and extends below grade.
*视频中的更多详细信息
Wall details – Outside to in:
* Steel panel
*瓦楞聚丙烯产生的6mm间隙
* Tyvek Commercial D
* 2×8的水平衬里，与锁定的柱子连接在一起，用岩盘绝缘
* Intello air barrier on inside of 2×8 girt wall
* 5/8″ air gap, plywood bracing in some areas
* 2×4 stud wall, 2′ centers, insulated with Rockwool
* 5/8“干蒸汽巴尔ier paint
“ Ubakus”工具中的墙模拟（附加屏幕快照）。输出为R37。
Attic – Blown in R80 fiberglass, extended heel trusses
Slab – 5.5″ inches of EPS. R22 total.
Mechanicals (all electric):
* 2 9 k c三菱冷limate mini splits
*踢脚线电热备用
* 80 gal heat pump water heater, ducted to pull from main room
* Panasonic Intelli-balance ERV, pulling from bathroom, dumping into bedroom closets.
* Inline MERV-13 V-type filter boxes on HPWH, ERV
* Iron filter, Water softener, CPVC piping
BEOPT中的仿真显示净零需要7K太阳能。
Windows: Wasco vinyl windows, high solar gain on south wall only
Building shell will be purchased as a kit, with engineer stamped drawings. Will be doing most of the work myself. Appreciate all the great information on this site. Looking for a last review before I move ahead with the project.
GBA细节库
由气候和房屋部分组织的一千个建筑细节的集合
Replies
埃里克，
在您非常详细的组件中不深入地涉水，跳出我的一件事是钢覆层的基础。泡沫闭合条主要用于阻止屋顶上的水渗透。它们也可能有效地阻止昆虫，但不会阻止啮齿动物。最常见的解决方案是使用面板底部的J闪烁来阻止波纹。闭合条背后是否有缝隙向外部开放，可以在雨屏腔中进行空气移动和排水？通过下面的壁板和保护性涂层之间的相交的细节将是有用的。
Hi Malcolm:
Added a picture of the base of the wall steel. Instead of a J channel, there is a drip cap trim blocking the corrugations. Behind the drip cap is the corrugated plastic material, creating an effective gap for air movement and drainage.
https://s3.amazonaws.com/greenbuildingadvisor.s3.tauntoncloud.com/app/uploads/2022/04/19212943/44472_1650418182_drip_cap_-700x540.png
埃里克，
对我来说看起来很完美。
Looks like a pretty solid build. I'm not a big fan of sheathingless walls, it does look like you have though of most details. I would still spend the money on some sheathing though.
I don't think the fans on most HPWH have much oomph. Putting a merv13 filter on it is asking for trouble. Maybe a washable fiber filter.
您需要在ERV的新鲜空气供应上进行管道消音器或弹性。没有这个，当ERV启动时，您会听到ERV的声音。您还可以为ERV拿到Lifebreath Tandem通风口，单洞穿过房屋，无需在卧室穿过管道。
有了这样一个绝缘的紧凑型地方，公用事业室中的一个纤细的管道单元可以与两个壁挂式安装座和备用踢脚线一起加热/冷却该地点。在道路上也更少维护。
2x8+2x4 double stud seems a bit overkill, if you have BeOpt set up, I would see what just the 2x8 ends up at.
Thanks for the review of the design.
1. HPWH上的滤波器是低压液V型。压降被列为.12英寸WG @417 CFM。在HPWH的CFM上可能甚至更少。如果需要，稍后可以将限制性过滤器放在框中。
https://www.hvacquick.com/products/residential/Filter-Boxes/Inline-Filter-Boxes/AirScape-SFB-V-Series-MERV-13-V-Bank-Inline-Filter-Boxes
2.看过Lifebreath Ervs，效率很棒。但是，希望将ERV与Boost一起用作浴室通风口。您是在建议将管道消音器放在ERV和卧室之间吗？
3.已经考虑了单个管道的迷你拆分。但是，在Beopt中模拟时的效率是很大的。我喜欢拥有两个相同单元的冗余。此外，这有效地增加了您的倒车比率。
4.我以前只有一个2x8墙，并在Beopt中进行了模拟。在双头螺柱之间的热桥上大大切断了双壁。外墙具有girt（水平螺柱），而内部则是常规的，有效地使其成为“穆尼墙”。同样，两者之间的腔体为完全不间断和受保护的空气屏障创造了一个好地方。
1:
The fan on the HPWH is probably this one:
https://d12qbzr1dyleru.cloudfront.net/m/a01f2babd9a4e7c1/original/Specification-Sheet-EBM-EC-Fan-Assembly-200mm-W1G200-EC91-10.pdf
0.12" is way too high. You probably need about 1/2 to 1/3 of that.
2:
I meant to use the Lifebreath tandem wall cap with the Panasonic unit. The Panasonic tandem cap is only good for 50CFM. The Intellibalance 100 is great value, there isn't much out there with remotely close to comparable performance for similar cost.
3.
Wall mounts are not zero maintenance. Drain lines clog and blowers get dirty. Having cleaned the blower wheel on my 3 zone multi a while back, I would try to avoid it. Changing a filter is much simpler even if less efficient.
4.
If you must have double stud, I would look at going with either 6x6 posts with 2x6 grits or 6x4 posts with 2x4 grits. Either option would be significantly cheaper and will barely change your overall energy costs.
1. Okay good point, will delete the extra filter on the HPWH.
2.起初很困惑，正在思考“ Lunos E2”。您是否建议使用下面的产品？入口和排气距离如此近吗？
https://www.lifebreath.com/us/product/ventilation-accessories-dual-hood/
3. I'm okay with added maintenance of the wall mounts. Planning to run the drain lines in PVC to the utility room sink. Drain lines will have cleanouts.
4.我知道2x6 Girts会更便宜。但是，2x8可以将6x6柱的舷外悬挂在1.5英寸处，以便与等级板齐平，而内部边缘则不在柱子的内部，用于连续的空气屏障平面。推荐。尝试使构建细节尽可能容易，因为我会很轻松。
Yup that is the part. I hope that there was some engineering put into it to prevent recirculating stale air. I've used the Panasonic ones with smaller ERVs, works great and really simplifies the install. Make sure to account for the pressure loss of the hood, like any wall cap, these do add a bit.
壁挂式排水管的问题不是排水管，而是排水盘。从排水盘到排水管线的孔非常小，由于没有很好的空气过滤，因此排水盘中有很多污垢。随着时间的流逝，这些收集并分解在块中，并堵塞排水盘出口。这是所有壁挂式迷你拆分的主要设计缺陷。