Best way to insulate old farm house walls

fomocosho|发布绿色建筑技术上2017年12月24日下午12:12

我们住在6B区，刚刚购买了一家旧农舍。隔板壁板需要更换，我想同时升级墙壁隔热层并解决空气浸润问题。目前有纤维素吹了。墙壁是板条和石膏，2×4螺柱，1英寸的木板，焦油纸，壁板。保持房屋的原始外观对我们来说非常重要，我们希望尽可能保留原始的装饰。我的想法是卸下外部板和所有纤维素，用闭孔泡沫喷涂螺柱泡沫，然后在螺柱上安装ZIP系统1英寸的ZIP系统。我还没有定价，但我想这会很昂贵。这将使墙壁厚度接近原始，因此在处理eves和窗户盒周围的装饰时减少了麻烦。这个计划有意义吗？有更好或更便宜的方法吗？

Thank You

回答

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答复

Steve Knapp CZ 3A Georgia|2017年12月24日下午01:27|#1

Is the board sheathing in good shape? If so, you could leave it and the existing cellulose in place (perhaps adding more). Then you could improve things significantly by installing R-7.5 of reclaimed rigid foam on the exterior. (Reclaimed foam is generally much less expensive than new product.) This would be a much greener and cost-effective approach than spray foam (especially as compared to older closed cell products that use problematic blowing agents).

You may want to search GBA for articles and discussion threads on doing a "deep energy retrofit." The more recent ones often argue for focusing on practical steps that improve comfort and performance without blowing up the budget.

If you avoid overspending on your project, you may be able to install a solar array and offset most or all of your carbon footprint. There are many variables to consider, but GBA is a great resource for planning how to move forward.
斯蒂芬·希希（Stephen Sheehy）|2017年12月24日下午2:06|#2

1993年，我们在缅因州购买了一家200岁的农舍。多年来，我们修复了东西，更换了东西，重建了东西。我们花了很多钱，最终得到了一间不错但效率低下的房屋。我们从经验中获得的唯一教训是需要制定长期计划，因此您需要按照财务允许的逻辑顺序进行工作，重点是主要内容。

从永久改善建筑物信封开始。首先，您的空气密封计划是什么？进行鼓风机的门测试。您会感到震惊，但要获取有关从哪里开始收紧这个地方的信息。

继续考虑隔热。闭孔泡沫很昂贵。我同意史蒂夫。外部泡沫很有意义。拍摄很多照片，以便您可以根据需要复制装饰，但计划将其删除。除非弗兰克·劳埃德·赖特（Frank Lloyd Wright）设计您的房子，否则您是否真的在乎您的装修是否真实？我们的房子是由一些无名农民设计和建造的。多年来，它显然经过了反复的翻新，但是除了专家以外的任何人都可以看一看，并认为这是一栋不错的联邦风格的房屋，尽管有十八世纪末和十九世纪初的各种装饰作品。

三到四英寸的泡沫并不是一个坏主意。

几年前，我们变得聪明并建造了新的:-)
fomocosho|2017年12月24日下午5:07|#3

I appreciate the advice. The exterior boards are in fair shape, a few would need to be replaced but that’s not a big deal. If I just added the insulation on the outside of the exterior boards is there a concern that there isn’t a vapor barrier on the inside between the cellulose and lath and plaster? The other concern I had about going that route is the roof overhang is not very big and I didn’t want to reduce it anymore if I didn’t have to. It is a two story home. I will do more reading on those deep energy retrofit articles.

Thank you
GBA Editor

马丁·霍拉迪（Martin Holladay）|2017年12月25日上午08:07|#4

福莫科肖，
问：“如果我只是在外部板外部添加了绝缘材料，那就担心纤维素，板条和灰泥之间的内部没有蒸气屏障吗？”

答：否。有关更多信息，请参阅以下文章：

我需要蒸气延迟器吗？

蒸气阻滞剂和蒸气屏障
Expert Member

Dana Dorsett|2017年12月26日09:10am|#5

Yarding out the cellulose and replacing it with closed cell foam is an expensive waste of high performance foam (that comes with a high environmental impact) that buys you very little additional performance, due to the thermal bridging of the studs. Save the high R/inch budget for going fatter exterior foam. See:

//m.etiketa4.com/articles/dept/musings/installing-closed-cell-spray-spray-foam-foam-bet-------------------

http://www.finehomebuilding.com/2017/07/10/closed-cell-foam-studs-waste

In zone 6 with 2x4 framing you'll need at least R7.5 on the exterior for dew point control, R8 if it's full-dimension 2x4s. If you're stripping the plank sheathing you'll be able to inspect the cellulose and fix any gaps, and you'd be in a position to upgrade the window flashing, If it's full-dimension 1x plank sheathing, the 2" ZIP-R would give you the necessary R value for dew point control on 3.5-4", adding just an inch to the total wall thickness.
GBA Editor

马丁·霍拉迪（Martin Holladay）|2017年12月27日上午10:40|#6

福莫科肖，
If you have only a minimal roof overhang, that might be a reason to choose metal roofing the next time you re-roof. It's easier to add a few inches of overhang with metal roofing than with other types of roofing.
fomocosho|12月29日，2017年09:56 AM|#7

Thank you for your replies. I got a quote for zip r panels they said 2” is not available but 2 1/2” is. They are $64 per panel and must be ordered in bundles of 18. This does not include the tape. They are R 12.6. This seems quite steep if I compare the cost of separate osb, foam, house wrap. The savings for me would be the ease of installation as this will be diy. I just thought someone might find the pricing info useful.

I agree taking the cellulose out would be foolish after your comments and more research, but I would want to do like Dana said and fill in any voids that are existing.

In the zip panel literature it says panels used on lateral shear walls need to have solid framing or blocking on all panel edges. Excuse my ignorance but how do I know if this applies to my home?

Thank You
Expert Member

Dana Dorsett|12月29日，2017年10:57 AM|#8

ZIP-R的材料成本很高，但是与单独的层相比，安装的人工成本相当低。详细说明这些单独层的技能水平也更高。

Many balloon framed antiques will have angled let-in bracing for shear strength.

https://renaissanceron.files.wordpress.com/2010/03/balloon_framing.jpg