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How to Find Studs Through Exterior Insulation

詹姆斯·默里|发布General Questions

Hi everyone,

I have 2 questions about installing vertical furring strips for siding over 3″ of exterior Roxul Comfortboad insulation (over a peel and stick WRB/exterior air barrier). I plan to connect the furring to the studs (nominally at 16″) with long structural screws through the insulation.

1) How do you efficiently locate the studs once WRB and exterior insulation are installed, to reliably hit the studs with the screws? I assume the studs will not all be at exactly 16″ c/c, due to framing having to line up for openings, beams, etc.

2)如果我在安装螺钉时确实错过了螺柱,那么我的本能是离开螺钉,否则我的外部空气屏障将有一个孔(我还计划有一个内部空气屏障)。但是,如果我确实卸下螺钉,我如何通过3英寸的Roxul绝缘构造如何密封1/4英寸的孔?

谢谢!

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答复

  1. Kyle Bentley||#1

    The real answer here is that it’s hard to do, and it’s a shame the difficulty isn’t discussed more often. Having said that there’s a few things that helped me achieve a first hit rate of about 93%. Even that isn’t great if you think about it, that’s 7 screw misses. Worse are the near misses, where you bust out the side of the stud, or if the grain cups to one side and bends the screw out, etc.

    Here’s a list of practical and somewhat impractical steps I took to help.

    0.做得很好,得到螺柱。这里比绝对间距更重要。

    1. Use a speed square to draw a line down the middle of each furring strip. It’s pretty quick when you have them in a pile and get after it.

    2.预先钻孔的每个螺钉中的孔中的孔。您可以同时执行此操作。它将使您的电池在安装过程中持续更长的时间,而您无需考虑。它有助于。如果可以忍受,请在孔中启动一个辅助螺钉,以便安装可以快速。

    3.标记螺柱中心在粉底上的位置,并用铅笔标记之类的光线标记。这将有助于排列底线。

    3.1 Align the rafters with the studs if possible. I used my rafter tail as a visual guide for the top of the furring strip. Line that up first, and plumb the furring strip with a 6’ level. That will get you close to being in the right spot.

    4.使用最小的直径紧固件,以满足您的负载要求。更便宜,分裂螺柱的机会较小。我尝试了Spax PowerLag,Fastenmaster Headlock和Simpson螺钉。我的偏爱是spax。批量购买它们,它们并不便宜。紧固件更便宜,但更脆弱的IMO,并且驾驶更多的麻烦。

    5. Use a drill and not an impact driver. It has sufficient deriving capability, is faster, and so much quieter. You can also feel a miss better.

    6.不要超越紧固件,只是在MW最小压缩就足够的位置。您稍后可以调整它们。

    7.屁股贴生态之间的绝缘ps. The edges are more compressible than the field, and if you try to hide an insulation seam with a furring strip it’ll be harder to make the wall flat while not having one or two that are sunk in too far.

    8. Pull a missed screw, and put on a dab of caulking from the inside of the sheathing. It’ll air seal the hole, and there’s no water getting through that much space to the web anyways.

    9.角落很难正确,我会考虑仅在这些区域的两层Polyiso层,也许在两侧一只脚,只是为了使它们正方形。

    10.在每条螺钉的每条线上都在角之间拉一条线条,然后微型调整毛圈条的平面几乎没有触摸。

    希望能帮助到你!

  2. 詹姆斯·默里||#2

    哇,凯尔,真是一个很好的回应!谢谢!我觉得您的回应可能是有关GBA或FHB的整篇文章。

    I was planning to use HeadLOK screws because I am familiar with other FastenMaster products, but will look into the spax also.

    Also, point 8, great idea and I am glad I asked now before all the stud cavity insulation is installed.

    我会记住,一旦我完成了任何经验教训(直到今年夏天晚些时候)就可以报道任何经验教训)。

    1. Kyle Bentley||#3

      感谢詹姆斯,尽管我承认只重复我在其他地方阅读的大部分内容,然后尝试了自己:)。除了演习外,我自己对噪音的仇恨还产生了那个。

  3. Vlad Shpurik||#4

    Great writeup Kyle! I'd like to add a couple of points as well from my personal experience:

    1. Make a template from 5~6" long piece of 4x4 hardwood block by predrilling it with the same drill bit you would use for predrilling furring strips. Drill this hole at a 5° angle. This template will make predrilling your furring strips much easier and more consistent.
    2. I highly recommend Strong-Drive® SDWS TIMBER Screw (Exterior Grade)https://www.strongtie.com/strongdrive_exteriorwoodscrews/sdws-db_screw/p/strong-drive-sdws-timber-screw-exterior-grade. Despite their larger diameter (compared to HeadLOC equivalent), they go in very easy and cause no splitting even when they are not driven in the center of the stud. I've done a few tests driving these screws off center of the stud and even as close as 3/8" to the stud edge they caused no splitting.

    1. Kyle Bentley||#6

      The Simpson sds screw is nice! I just thought they were overkill when I tried a box of them. I’m nearly certain I could winch the earth closer to the moon with one, if I had a long enough cable.

      我与他们遇到的问题可能是我正在使用的木材。所有带有宽环环的SYP。很多时候,它会遵循两个夏季戒指之间的频道,并在螺柱之间进行部分,而无需分开。我会看看是否可以找到图片。

  4. Expert Member
    马尔科姆·泰勒(Malcolm Taylor)||#5

    James,

    I've used one of these to keep the holes aligned with good success.

    1. Kyle Bentley||#7

      Lining a stack up on a drill press wouldn’t be a bad idea, but they’re one of those tools that are super handy to have, once or twice a year it seems. Nobody has the tall ones. I wish they were cheaper.

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