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Unread 06-29-2019, 02:55 PM   #31
cx
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In your climate your local code likely specifies a vapor barrier material on the interior framing surface of your exterior walls, Spencer, and, I presume, your floor framing over unconditioned space. You might wanna discuss that with your code compliance people if you've permitted this project.

If that's the case, the vapor barrier would most properly be under the subflooring, but for your application the DitraHeat material would probably satisfy your inspector so long as all the joints were covered with Kerdi or similar.

If you don't need to comply with code, I'd still treat the floor that way and install un-faced insulation in those joist bays.

My opinion; worth price charged.
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Unread 06-30-2019, 05:26 AM   #32
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And that's how I did mine, Spencer, unfaced. Mine is also above an unconditioned garage, with Ditra Heat on top.

Don't know if you're having yours inspected, but mine is. The inspectors never made a single comment on the insulation in the floor or walls.
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Unread 09-17-2019, 06:21 PM   #33
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What drill bit is recommended for drilling small holes (1/4inch) in tile?
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Unread 09-18-2019, 02:44 AM   #34
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Depends on the tile. If it's a soft wall tile, like the 4 1/4" tiles, a standard masonry bit will go through them.

If it's more dense, like a porcelain tile, it'll take something different. I like these to get a hole started, but they tend to bottom out after they about 1/16 - 1/8" in.

Then I switch to something different, sometimes the standard masonry, or I have a set of bits that I got cheap that seem to work well. They just have to kept wet while using them.

And you can hear the bit scraping the tile as it turns. So if you don't hear that, you're not cutting anything, and need to switch to something else. But don't put too much pressure, especially on that tile bit linked above, and keep the speed low.

If the tile is not installed yet, make a ring of plumber's putty to hold some water so you can submerge the bit. If it's already on the wall, use a spray bottle to keep water on it as it cuts.

Just saw these on the Lowe's website. Haven't seen them before, so I don't know how well they work.
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Unread 09-18-2019, 06:03 AM   #35
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I used..I think they are Milwaukee, carbide hole saws from home depot to get through my porcelain tiles. They seem to work pretty well and come in quite a few different sizes. Takes a bit of time but not too bad. Though you're supposed to keep them wet, which I mostly did, I found they actually cut better when dry.

I had to drill a total of 14 holes, some were 3/16th" but most 1/4".
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