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Old 01-18-2011, 01:28 AM   #1
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Basement Subfloor


The basement subfloor I need to build is 11'x10'.
I dont know how to run the 2x4s across the cement slab in a staight line.
Do I need to buy 10' 2x4s or how should I connect the 8' 2x4s?

It seems I know many things except the simplest.

Thanks!

The Plan:
6 mil vapor barrier overlapped and 4" up walls
rigid floor insulation
2x4 sleepers spaced 16" on center
23/32" t&g OSB perpendicular & staggered seams 1/8" gaps all around
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Old 01-18-2011, 05:14 AM   #2
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Basement Subfloor


What are you installing on the OSB ?
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Old 01-18-2011, 02:35 PM   #3
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Basement Subfloor


Not quite sure.
If it stays storage, then nothing or something cheap like masonite.
If I need to finish it, then whatever I can get cheap on craiglist.

Right now the plan is that it will be a low use room.
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Old 01-18-2011, 02:47 PM   #4
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Basement Subfloor


.....and what is wrong with it the way it is? Why do you feel a need to improve the floor?
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Old 01-18-2011, 03:00 PM   #5
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Basement Subfloor


It is really cold in there.
Think North Washington state and 6' below grade.

It is on my to do list.
It would increase value of home... blah blah blah
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Old 01-18-2011, 07:29 PM   #6
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Basement Subfloor


......and chances are you'l be creating a "mold-trap". Building a subfloor over below grade concrete covered with plastic sounds nuts to me.

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Old 01-18-2011, 11:37 PM   #7
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Basement Subfloor


So then what?
*Opens door for constructive ideas
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Old 01-19-2011, 06:51 AM   #8
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Basement Subfloor


dri-core or equivalent
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Old 01-19-2011, 01:11 PM   #9
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Basement Subfloor


The floor is not the levelest floor, and this was very interesting:
http://www.cqs.com/homeqa/dricore.htm
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Old 01-19-2011, 01:53 PM   #10
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Basement Subfloor


I would imagine the best way to insulate and build a sub-floor on subgrade concrete would be similar to that of insulating walls below grade. 2" XPS, directly to concrete, followed by sleepers, then a sub-floor material such as OSB or plywood.

http://www.homeconstructionimproveme...oncrete-floor/

Similar to what you had originally though minus the plastic.

Putting plastic directly on concrete is not wise as it creates an opportunity for moisture to pool and then having no where to go, you really want the concrete to as they say, "Dry to the Inside".

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Old 01-19-2011, 05:44 PM   #11
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Basement Subfloor


Okay, that makes sense. Thank you Mark.
XPS-> sleepers->OSB

How do I lay 8ft sleepers in an 11x10 room?
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