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Thread: Shop Build...should be a fun journey...

  1. #331
    Join Date
    Mar 2003
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    SE PA - Central Bucks County
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    61,618
    Quote Originally Posted by Greg Funk View Post
    Looking good. Do you also plan to put some steel mesh down? We had 6x6 mesh it on our slabs and used it to secure hot water heating pipes. Not sure if it was for strength or to allow the pipes to be attached.
    3500 psi fiber mesh concrete. No steel required for this floor

    Quote Originally Posted by Adam Grund View Post
    Out of curuousity, do you know if the “squish” of the insulation would pose a problem with the concrete if you drove heavy vehicles over it regularly? Honestly I’ve never heard of doing that, and my mind went to right what I’d be using a garage for, working on cars.
    I honestly don't know, but I've seen plenty of videos where hydronic heat went in over foam that then had a reinforced slab poured over it that was intended for hefty vehicles. The foam really doesn't "squish" or compress unless you hit it with a point source, such as your kneecap.
    --

    The most expensive tool is the one you buy "cheaply" and often...

  2. #332
    Join Date
    Jul 2007
    Location
    NE OH
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    2,208
    Quote Originally Posted by Adam Grund View Post
    Out of curuousity, do you know if the “squish” of the insulation would pose a problem with the concrete if you drove heavy vehicles over it regularly? Honestly I’ve never heard of doing that, and my mind went to right what I’d be using a garage for, working on cars.
    Foam under slabs is pretty much standard practice in building these days; has been for a while. A lot of heat is gained or loss through the slab without insulation. Compressive strength of XPS foam (which is what Jim used) varies depending on specific type, but starts at about 15 psi, which is over a ton per square foot. XPS is available in strengths up to 100 psi, or over 7 tons per square foot. When you factor in that the concrete distributes the load over a greater area, even 15 psi foam isn't going to be "squished" by a car's weight.
    --Certainty is the refuge of a small mind--

  3. #333
    Join Date
    Nov 2006
    Location
    Atlanta
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    1,246
    I thought the xps acted as a vapor barrier when taped , so why the plastic sheeting too ?

  4. #334
    Join Date
    Nov 2006
    Location
    Vancouver, BC
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    821
    Quote Originally Posted by Dave Sabo View Post
    I thought the xps acted as a vapor barrier when taped , so why the plastic sheeting too ?
    XPS is not a very good vapor barrier. 2" thick XPS is an order of magnitude more permeable than 6mil poly according to the manufacturer.

  5. #335
    Join Date
    Mar 2003
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    SE PA - Central Bucks County
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    61,618
    That's my understanding, too, Greg. The tape on the foam isn't really sealing all that much because the stone under it isn't perfectly smooth, too. Of course, NOW it's flat to the ground with tons of concrete on top. LOL

    -----

    The floor pour went well today...and yes, all the floor stuff will get it's own time lapse episode. But here's a shot after they left. The lighting/reflections/"pushing the exposure", etc., make it look rough, but it's smooth as a baby's backside, other than the apron which has a broom finish. I'm very pleased. They will be back in a day or so to saw the expansion joints that try to keep any cracking over time from being random.

    IMG_E2490.jpg

    And from above...

    IMG_2491.jpg
    --

    The most expensive tool is the one you buy "cheaply" and often...

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