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Recommended taping of plywood and foam layers

dburgoyne|Posted inGreen Products and Materialson

I am building a small casita (500 sq. ft.) in Northern California in a mild climate with hot summers. My wall framing is 2×4 w/ 3/8 continuous plywood shear (also insulated w/ R-13 fiberglass batt insul.), which I will cover with two layers of 1/1/2″ Polyiso (Firestone) insulation (has fiberglass reinforced face). I will cover everything with Tyvek housewrap and fasten 1×4 battens creating a rainscreen, and attach lath and plaster as an exterior finish to the battens.

我已经阅读了胶合板胶合板和绝缘层的重要性,但是我正在考虑四个级别的录音,我想知道是否有必要。

1.胶合板接头 - Polyiso将覆盖并固定在适当的位置,如果将其像在三明治中的生菜一样,我真的需要购买具有优质粘附和渗透性的昂贵胶带吗?

2.胶带隔热层(2层1 1/2英寸总计3英寸) - 相同的三明治问题,并想知道冗余吗?

3. Tyvek housewrap – I read its not really necessary to tape horizontal laps, but vertical laps.

我真的需要在所有四层胶带上胶带,这在哪里最有益?在这些条件下,真正需要哪种类型的胶带?

Thanks,
-Dan Burgoyne

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答复

  1. 外部||#1

    作为一个非专业人士也生活在北加州气候中的非专业人士(甚至可能离您很近),我会忽略胶合板的胶带,并专注于录制两层泡沫。Tyvek的录音只是所有构造的一部分,根本不是您所描述的其他录音带。

    如果您像听起来一样担心空气浸润,那么我会放弃瓦特绝缘材料并租用纤维素鼓风机,并亲自散发纤维素。只要您关注细节,它就简单又便宜。纤维素致密墙壁堆积的侧面好处是,如果您生活在城市环境中,它确实会减少气流,并会降低外部噪音。

    In a California environment one can practically get to Passive House insulation and air sealing standards with the building techniques that would entail. Of course that would also have to include the important wall/ceiling and wall/floor air and insulation junctions.

  2. dburgoyne||#2

    您推荐哪种胶带给泡沫?您真的认为在泡沫下贴上胶合板没有什么好处?

    我已经买了一包玻璃纤维绝缘材料,认为如果我在外面添加了3英寸的Polyiso,那么担心腔体隔热效率的差异并不那么重要。

    我还用3英寸的XPS绝缘板边缘,并有两层1/4英寸的窗台密封剂(一个下方,一个在白蚁盾上方),并计划泡沫密封顶部板和屋顶之间的关节框架。

  3. 外部||#3

    我不是不同磁带及其应用的专家。我会在这方面屈服于其他人,并希望他们在这里鸣叫。就胶合板贴上的需要,很多时候,您会在被动房屋建筑中看到“皮带和吊带器”多点的空气密封的描述。那是因为很难进行0.6 ACH 50鼓风机门测试。他们必须执行多个级别才能获得该认证。但是从实际的角度来看,如果您不参加认证,则不会看到房屋性能在0.6 A D 1.0 ACH 50之间有明显的区别。
    difference to you or me would really only be in the certification difference. You are really already getting multiple sealing with 2 overlapping staggered rigid foam layers that are individually taped. And that still doesn't count for the impossible to stagger joints at windows and doors where the real problems are and which taping the plywood can't affect.

  4. GBA编辑
    Martin Holladay||#4

    Dan,
    你对这事太多心了。您正在构建一个500square-foot tiny house in Northern California (a "mild climate with hot summers"). Your utility bills will be tiny.

    不用担心空气密封。您甚至打算安装机械通风系统吗?我的猜测是,您的窗户通常会打开。

    这是我的投票:胶带一层。您可以选择所需的任何图层。一切都会好起来的。

  5. dburgoyne||#5

    Thanks for the feedback. Which layer would be best to tape? I am planning to install a 3/4 ton ductless mini split, primarily for air conditioning during hot summers.

  6. GBA编辑
    Martin Holladay||#6

    Dan,
    Tyvek胶带比欧洲磁带更便宜,因此,如果您想降低成本,请将Tyvek层胶带。由于您的目标是减少空气泄漏,因此胶带水平和垂直接缝。

    If you are willing to spring for a roll of Siga Wigluv tape, use it to seal the seams in the outermost layer of rigid foam. That will give you a more effective exterior air barrier than taped Tyvek.

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