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-   -   Garage conversion subfloors (http://www.diychatroom.com/f19/garage-conversion-subfloors-88530/)

chris mione 12-03-2010 09:30 PM

Garage conversion subfloors
 
I am converting a garage into a bedroom. The garage has a concrete floor and is surrounded by block walls. We installed a vapor barrier on the concrete floor then built up the subfloor with conventional 2x6 floor joists. The inspector is telling me, that the subflooring has to be pressure treated. What is the answer to this problem? I don't want to have to remove my entire subfloor.

Octopus 12-03-2010 10:51 PM

When you say "subflooring", I think plywood that covers the floor joists, but it sounds as though you are referring to your actual floor joists themselves.

How much air space between concrete and non trated framing material?

Also, ask the inspector if you can use this paint on preservative...

http://www.google.com/products/catal...ed=0CGcQ8wIwAA#

chris mione 12-04-2010 07:05 AM

Quote:

Originally Posted by Octopus (Post 545077)
When you say "subflooring", I think plywood that covers the floor joists, but it sounds as though you are referring to your actual floor joists themselves.

How much air space between concrete and non trated framing material?

Also, ask the inspector if you can use this paint on preservative...

http://www.google.com/products/catal...ed=0CGcQ8wIwAA#

Little space if any, and yes I am referring to the floor joists. We used a vapor barrier on the floor before we put the floor joists down, and it is completely surrounded on all sides by block/brick or concret, plus it is above grade. I don't get it!

chris mione 12-04-2010 08:48 AM

Octopus,
Thank you for your Rustoleum tip. I don't see any reason we can't apply that and make the sub-floor meet the requirement. I didn't see the sense installing a complete pressure treated sub-floor, but that is what the IBC is calling for, it is section IBC 2304.11.2.4: Sleepers and sills on a concrete or masonry slab that is in direct contact with earth shall be of naturally durable or preservative treated wood.
I think the application of the Rustoleum makes it naturally durable, don't you?
Thanks again,
Chris

tpolk 12-04-2010 08:55 AM

sounds like the vapor barrier would be a moisture /slab separation in lieu of paint or pressure treated

chris mione 12-04-2010 09:18 AM

Quote:

Originally Posted by tpolk (Post 545186)
sounds like the vapor barrier would be a moisture /slab separation in lieu of paint or pressure treated

I thought it was too. I believed that was all we needed to do for a moisture barrier, but not according to the inspector. He quotes the IBC 2304.11.2.4 referring to sleepers and sills, they must be pressure treated or wood preservative if they are on a concrete slab that is directly in contact with earth. Frustrating.

Joe Carola 12-04-2010 10:03 AM

Quote:

Originally Posted by chris mione (Post 545202)
I thought it was too. I believed that was all we needed to do for a moisture barrier, but not according to the inspector. He quotes the IBC 2304.11.2.4 referring to sleepers and sills, they must be pressure treated or wood preservative if they are on a concrete slab that is directly in contact with earth. Frustrating.

So you're saying that the actual 2x6 floor joist that are on edge or flat are sitting on the foundation? There are no sleepers first and the floor joists nailed on top?

chris mione 12-04-2010 10:23 AM

Joe,
It is standard framing, with perimeter band boards and 2x6x12 spf floor joists between the bandboards. The moisture barrier was installed on the concrete floor first then the floor joists. They may be off the floor 1/2"-1" at places. That is about it though.
Chris

Joe Carola 12-04-2010 10:32 AM

Quote:

Originally Posted by chris mione (Post 545250)
Joe,
It is standard framing, with perimeter band boards and 2x6x12 spf floor joists between the bandboards. The moisture barrier was installed on the concrete floor first then the floor joists. They may be off the floor 1/2"-1" at places. That is about it though.
Chris

Are the back of band boards spf and up against the foundation bolted and floor joists on hangers?

chris mione 12-06-2010 09:08 AM

The back of the band boards are bolted into the block walls, but we did not use hangers because the joists are on the moisture barrier on the floor.
Chris
The local building inspector has ok'd the floor, he said as long as we installed a moisture barrier we are ok. I hope this is enough for the bank FHA inspector.

Experto 10-12-2011 02:33 PM

IBC vs IRC
 
This is old news by now, but I have been doing some reading and anyone else who runs into this issue might be interested:

I think the problem came from the inspector applying a commercial code to a residential project - IBC 2304.11.2.4 (commercial code) doesn't have a provision for a vapor barrier exception to the slab on ground condition, whereas IRC R319 (residential coed) does.

IRC R319-3:
"Sills and sleepers on a concrete or masonry slab that is in
direct contact with the ground unless separated from
such slab by an impervious moisture barrier."


IBC 2304.11.2.4:
"Sleepers and sills. Sleepers and sills on a
concrete or masonry slab that is in direct contact with earth
shall be of naturally durable or preservative-treatedwood."


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