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Old 01-20-2013, 10:05 PM   #1
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Couple basement subfloor questions


I'm getting ready to submit for permit and had a couple questions about the subfloor.

After i insulate the walls with 2" XPS I'm going to put 1" XPS on the floors. My questiosn are:

1. Do I frame direct on the XPS or do I put the Plywood down first and frame on top of that?

2. Should the subfloor extend to all parts of the basement? Specifically, storage areas, utility rooms, bath room?

3. How close should i get to my sump/furnace/drains?

4. Is there a bid difference in using 3/4" Advantec vs two layers of 1/2? I have seen people go both ways. Head room is not an issue.

5. How do i fix the stairs since the new floor will raise a couple inches?

Here is my latest floor plan if it helps at all.

http://www.scribd.com/doc/120242624/Basement-v12



Thanks for any and all help.

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Old 01-21-2013, 02:48 AM   #2
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Couple basement subfloor questions


ryan: first, where are you? second, what is your planned use for the floor you are insulating? (play room, workshop, etc).

whatever thickness you use, remember that an inch is not a great deal. if headroom is not a problem, two, 1" layers w/ staggered seams (all taped and spray foamed between gaps) is what i'd suggest (that depends somewhat on where you are, too). are you going to tapcon the plywood to the floor?

you mentioned framing; another sub-floor atop the rigid foam, or just interior walls? if just walls, i'd install 3/4" t&g ply and tapcon that to the floor, then build any walls atop that.

depending on what will be in the room, use rigid foam w/ sufficient psi for the job, remembering that the advertised psi on rigid foam is for (approx) 10% deflection, which is getting into the permanent deformation range. thus, us 3x-psi foam: ie, if you are going to have a large machine at one spot, and it will load up 10 psi, use 30 psi foam. vapor barrier on the floor first, then foam.

vinyl flooring can be problematic if you have any moisture in the slab, so something more vapor open would be safer. can you stub up the drains at all, using a smaller drain inside the old one?


Last edited by oh'mike; 01-21-2013 at 07:03 AM. Reason: added spaces
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Old 01-21-2013, 07:06 AM   #3
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Couple basement subfloor questions


Your location is needed for code advice----subfloors in a basement are uncommon and often are damaged by water----requiring ripping it all out---

I'll leave this for others---I do not like the idea because of water under the subfloor.
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Old 01-21-2013, 12:44 PM   #4
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Couple basement subfloor questions


I'm just noth of Chicago.

The basment is going to be multi purpose. Rec room, living room, bar, office, play room. I orgianlly planned on using a subfloor for the entie area.

For the rec room/livingroom/play area i was thinking engineered hardwood.

For the bar i wanted to do ceramic tile.

For the office i wanted carpet.

My main reason for the subfloor was to keep things warmer and get away from the "basment" feel.
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Old 01-21-2013, 01:21 PM   #5
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Couple basement subfloor questions


Thick carpet pad and high quality carpet----heat mats under the tile---best quality mat under the engineered floor---and the subfloor could be omitted.

I know your area and have built many nice basements in homes like yours----the subfloor is not needed or recommended.

Just my opinion based on many years of building and restoring water damaged basements.
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Old 01-21-2013, 01:37 PM   #6
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Couple basement subfloor questions


Thanks Mike, if I won't lose too much warmth i dont might ommitting the subfloor.

Is this the type of mat you are refering to for under the tile?

http://www.homedepot.com/buy/qep-3-f...tem-72135.html

Also- do you advise basebaord heaters?
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Old 01-21-2013, 01:50 PM   #7
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Couple basement subfloor questions


Yes---Nu-heat has a good track record----and there are other tried and true brands---
Other members could guide you on best brands---

If you have forced air heat---Have a heating company come see if it has the capacity to condition your basement---most do---

I've never installed baseboard heat in a house with forced air---we always use the existing furnace and perhaps some extra duct work----

Heat mats can be used under carpet or even your engineered floor---

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