Exterior wall help on new home construction

马特安德森|Posted inEnergy Efficiency and Durabilityon2013年3月6日09:35 AM

This is my first post, but I’ve been reading and gathering all the information I need to make and informed decision on how I would like my walls to be constructed. We will be building in Central Iowa (Des Moines area) and I am trying to have the house to follow the IECC 2012 standards at minimum (based on budget and needs). We live in Zone 5 and I am ultimately trying to achieve an R30 Whole wall.

Here is the wall from built outside in Please let me what your thoughts/concerns. I am open to any suggestion.

1.木纤维增强水泥覆盖壁板
2.外部乳胶漆
3. 1/2“厚防腐处理的垂直胶合板捆扎在带有3M的嵌入式接缝的螺柱中使用3M天气闪烁胶带（8067）
4. 2” EPS rigid foam, staggered and taped seams with housewrap tape
5. Tyvek Homewrap.
6. 1/2“厚胶合板壁护套
7. 24“o.c的2×6螺柱。
8.5.5“致密的包装纤维素
9. 5/8“厚空气密封干墙（气密干墙方法）

此外，如果您有任何您建议的产品，我很乐意听到那些。

Thanks everyone for getting me this far, let’s go the distance:)

-Matt.

Answer

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答复

专家成员

Armando Cobo|2013年3月06日04:15 PM|＃1

Very good assembly as far as I'm concerned. Don't forget the moisture management details.
专家成员

达娜·迪斯特|Mar 06,2013 05:03 PM|＃2

这是一个可接受的组装，但是对于2x6框架的外部r勉强的IRC MIN。在外部的副作用中没有2英寸的eps，并且在外部的eps中没有大量露点余量，R20-ish中心腔。

它也不是全墙。A 2x6 studwall at 24" o.c. is typically about a 20% framing fraction (at about R5.5) and with the rest of the stackup of siding/sheathing/gypsum makes the rest comes in around R14 average after thermal bridging. Add in theR8 EPS, and you're around R22 whole-wall (R30 at center-cavity only.)

To hit R30 whole-wall: A 2x4 16"o.c. studwall wall at a typical 25% framing fraction would be about R9 after thermal bridging, with siding/sheathing/gypsum added in. Add 3.5" of rigid polyiso (R21) you'd hit your nominal R30, at about a half-inch thinner wall assembly than the one described.

并且注意，在护套外部的中心腔比R21，R13内部，在护套处具有相当巨大的露点控制余量。

提示：Polyiso屋顶泡沫经常在商业建筑物重新屋顶和拆除期间清除，并且可以拥有5 / 4-1 / 3处于处女储备的成本。它有许多标准厚度，但2“，2.5”和3“相当普遍。一个4.5英寸或3英寸的回收屋顶Polyiso和1 / 2-1”层的1.5磅箔面对的原始原始库存外观将花费不到两个1“的EPS层。我在我附近有多个供应商，但InsurationDepot.com全国范围内填写（价格。）但是只致电当地商业屋顶承包商将经常挖掘当地来源。

There is nothing greener than re-use of existing building materials, and in high-R foam-overs it can save thousands in up-front cash too- spend the difference on granite counters if you like (the thermal mass of the granite lowers energy-use too! :-) )
Scott Schaub|2013年3月06日09:05 PM|＃3

Tyvek在你的大会上做了什么？是必要和有效的空袭吗？人们认为像envirodri（http://www.guaranteeddrybasements.com/products/enviroDri.asp）？谢谢你的帖子，也是绝缘仓库的尖端。
GBA编辑器

Martin Holladay|2013年3月07日04:46 AM|＃4

斯科特，
有关液体应用WRB的更多信息，请参阅：

Housewrap在A CAN：液体施工的WRB

新的绿色建筑产品 - 2012年7月
马特安德森|2013年3月07日08:48 AM|＃5

谢谢每个人的回应。

I echoed what was stated above to the builder and his responses are below.

1. 2x6 24.O.c可能不适合房屋和给定的雪和其他可能需要考虑决定的载荷。

- my thought process was to implement some advance framing concepts -
椽子/桁架对齐螺柱
Energy Heel trusses
单顶板
Eliminating jack studs
梯形“T-WALL”交叉点
Two stud corners
绝缘标题

他认为安装泡沫将导致额外的水分和水损坏。他更喜欢的墙体结构是（在外面）
水泥Boad壁炉
（没有提到雨水或毛刺）
Tyvek Housewrap.
7/16“OSB.
Spray foam the interior stud bays (along the gaps, not the whole bay)
R23 BIBS
1/2“干墙

Any thoughts on this?