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Old 07-03-2013, 02:16 PM   #1
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Insulating Floor... Ideas please


Insulating the floor... Any ideas?
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Old 07-03-2013, 02:21 PM   #2
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Insulating Floor... Ideas please


curious, what is the size of the joist and the span? looks like 2x4's
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Old 07-03-2013, 03:08 PM   #3
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Insulating Floor... Ideas please


2x6 Pressure Treated on 16" centers / 13ft span in 1st room. 16' span in the 2nd room.

Ill be running a 4x6 support beam down the 9.5" depth below floor joists. And ill be support the other portion with just blocks nailed to the side to brace the floor. I still have to level the joists out

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Old 07-03-2013, 03:53 PM   #4
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Insulating Floor... Ideas please


Support beam + braces haven't been installed yet in those pictures. But will be done after today.
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Old 07-03-2013, 07:39 PM   #5
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Insulating Floor... Ideas please


Foam Board? Insulation Bats?
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Old 07-03-2013, 07:46 PM   #6
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Insulating Floor... Ideas please


Seem to be missing a vapor barrier, joist hangers, blocking. I'd never use a 4 X 6 for a beam, they twist, check, and bow.
Is that wood pressure treated?
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Old 07-03-2013, 08:20 PM   #7
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Insulating Floor... Ideas please


The support beam is in place 18'10" as well as the other portion with blocks for height adjustments

My wood is fine......

2x6 pressure treated ac2

4x6 pressure treated critical structure

Cedar Shimmed

Joists hanger Triple Zinc for the 9.5" underneath the one area

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Old 07-03-2013, 08:21 PM   #8
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Insulating Floor... Ideas please


And why would I need a vapor barrier on this? Vapor barrier to prevent what moisture and from where?
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Old 07-03-2013, 08:25 PM   #9
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Insulating Floor... Ideas please


Sooooooo
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Old 07-07-2013, 08:22 AM   #10
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Insulating Floor... Ideas please


You will need a capillary break between the concrete and the insulation if you go with anything fibrous or hydrophilic.

Rigid foam will work well here and works well in basement slab applications.
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Old 07-07-2013, 08:30 AM   #11
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Insulating Floor... Ideas please


I would use solid foam, rated for a moist environment, as the concrete is going to wick moisture from the soil upwards. Not a huge amount, but some. You could use spray on foam if it is rated for direct contact with concrete, but the hard styrofoam (I used some Owens Corning dense pink stuff in my basement) can be cut to size easily and fitted, and will form a nice vapor barrier to keep your floor dry.

I too would be a bit concerned about twisting of the PT lumber as it changes moisture content. Maybe not a big problem, as this room may have a relatively constant moisture content. Just curious how you nailed the joists to the beams.
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