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Old 10-26-2011, 05:13 PM   #1
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Installing Hardwood Over Stem Wall


I'm installing a heart pine floor (salvaged, discussed in another thread) and have run into a wrinkle I hadn't considered. Nearly all of the subfloor is Advantech. One exterior door, however, is set directly on a poured concrete stem wall. Any tips on how to secure my flooring here? I presume I need some sort of combo vapor barrier and adhesive, yes? Are there any issues transitioning from my siliconized paper and cleat-nailed system to adhesive? Any tips appreciated.

Matt


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Old 10-26-2011, 05:52 PM   #2
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Installing Hardwood Over Stem Wall


PL Premium directly on the concrete---

Use a junk putty knife to add a thin skim coat first--then a double bead of glue for each board---you will need weights and spring boards to keep it down and wedged as you work.

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Old 10-26-2011, 05:54 PM   #3
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Installing Hardwood Over Stem Wall


A picture from farther back would help--I don't see the concrete in the picture.
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Old 10-26-2011, 06:04 PM   #4
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Installing Hardwood Over Stem Wall


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A picture from farther back would help--I don't see the concrete in the picture.
Wow, that was fast! It's a really small strip, around 3". The stem wall is sized for 2x6 walls, but the door jamb/transom is sized for 2x4. Since it's an exterior door, I had it mounted flush to the outside wall, and after the floor is done I'll install jamb extensions and moldings.

Here's a marked up photo:

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Old 10-26-2011, 06:09 PM   #5
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Installing Hardwood Over Stem Wall


Oh--Just that little bit--- PL premium right on the concrete---you'll be fine.
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Old 10-26-2011, 06:20 PM   #6
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Installing Hardwood Over Stem Wall


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Oh--Just that little bit--- PL premium right on the concrete---you'll be fine.
Awesome, that's much easier than I thought it might be. The concrete has been poured for at least three months, so not worried about the concrete curing releasing water, but I assume PL Premium is all I need for a long-term vapor barrier? On the skim coat, do I need to let it set up before I apply the beads for the wood? Anything special needed there (e.g. notch trowel like thinset) or just as it comes out of the tube? Heavy or light hand on qty? Am I overanalyzing it yet?

Matt
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Old 10-26-2011, 07:02 PM   #7
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Installing Hardwood Over Stem Wall


Just make a skin with the adhesive---that will be a good enough vapor barrier for that--then apply two beads of PL on the boards in that area--no need to wait for the skin to dry---Mike---

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