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Structural Inspections Contains discussions about the structural portion of a home inspection. This includes foundations, framing, etc.

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  #1  
Old 3/10/06, 5:03 AM
Greg Sullivan Greg Sullivan is offline
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Default Warm spot in garage floor?

Anyone know why my garage floor would have a warm spot that is about 12 degrees above ambient? The area is about 1 foot in diameter.

It's not from cars or sunlight. The garage floor is a slab. I have detected no water leaks.

I measured the warmth with an infrared temp gun. The warmth is there day or night.

My house is all electric. No gas. First thing in the morning, the warmth is still there.

What could be making that one little area warmer than the rest of the garage floor?

Thanks in advance,
Greg Sullivan / Canyon Lake, CA.

Last edited by Greg Sullivan; 3/10/06 at 5:08 AM..
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  #2  
Old 3/10/06, 6:08 AM
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wforsyth wforsyth is offline
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Default Re: Warm spot in garage floor?

Is there any piping that runs under the slab?

Septic?

I have had a septic leak cause something like this before. Not a pretty picture.
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  #3  
Old 3/10/06, 10:35 PM
Greg Sullivan Greg Sullivan is offline
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Default Re: Warm spot in garage floor?

I don't think there was a septic tank but I really don't have a way to know...one way or the other. As a test, before going to bed, I turned everything off - including water heater and heat pumps. Next morning, there was still a 12 degree difference between the warm spot and the rest of the garage floor. That's exactly the same difference from the night before. It doesn't change in response to anything I've tried.

I'm very tempted to get a jack hammer and see what's going on.

No one else has seen this before?

Thanks for your feedback.
Greg Sullivan / Canyon Lake, CA.
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  #4  
Old 3/10/06, 10:39 PM
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tneumann tneumann is offline
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Default Re: Warm spot in garage floor?

Please take pics of your wife's face after you jackhammer a hole in the concrete.

I wish I knew..but please keep us updated as to this mystery.
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  #5  
Old 3/10/06, 11:46 PM
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whandley whandley is offline
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Default Re: Warm spot in garage floor?

Althought uncommon, soil composition can generate high temperatures. What part of Canyon Lake are you in? Any chance there's high alkali content in the soil under your structure? Have you noticed any spalling and or efflorescence developing in the garage concrete slab surfaces? Do fresh water and or main waste line plumbing run under the garage slab?
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  #6  
Old 3/10/06, 11:59 PM
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Jay Moge Jay Moge is offline
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Default Re: Warm spot in garage floor?

hey, i think you found Jimmy Hoffa.
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  #7  
Old 3/11/06, 6:27 AM
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Paul Hinsperger, CMI Paul Hinsperger, CMI is offline
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Default Re: Warm spot in garage floor?

Before busting up the floor, use a regular contact thermometer to verify the temp difference. The infrared temp gun's emissivity reading is effected by the amount of reflective surface. Its possible that there was some oil or other chemical spilled there once affecting the reading. The amount of reflective change is not always enough to be noticeable by the eye.

If you ever tried to use an infrared temp gun to take a reading on a galvanized plenum you know what I mean. I use 4"x4" magnetic sheet to stick on the plenum first and give them enough time to reach the same temp as the plenum before taking the reading.



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Paul Hinsperger, CMI
Orangeville, Ont NACHI ID03121513
Hinsperger Inspection Services Ltd
NACHI Awards Committee
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  #8  
Old 3/11/06, 7:58 AM
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David P. Valley David P. Valley is offline
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Default Re: Warm spot in garage floor?

It's a poured floor over a nuclear dump.Attachment 1990

Last edited by dvalley; 10/7/07 at 4:41 PM..
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  #9  
Old 3/11/06, 8:45 AM
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Carl A. Brown Carl A. Brown is offline
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Default Re: Warm spot in garage floor?

ET phone home!!
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  #10  
Old 3/12/06, 7:43 AM
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Default Re: Warm spot in garage floor?

Sounds like a hot water line leak.
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  #11  
Old 3/12/06, 7:48 AM
rwand1 rwand1 is offline
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Default Re: Warm spot in garage floor?

I like the body or animals body buried in that spot, and I like the nuclear waste scenario. Can you get your hands on a Giger counter?
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  #12  
Old 3/12/06, 10:38 AM
mbledsoe mbledsoe is offline
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Default Re: Warm spot in garage floor?

An infared camera pic might give a better clue.
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  #13  
Old 3/12/06, 11:39 AM
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David P. Valley David P. Valley is offline
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Default Re: Warm spot in garage floor?

Quote:
Originally Posted by mbledsoe
An infared camera pic might give a better clue.
Not necessarily.

This camera would only indicate what the area temperature differentials are.
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  #14  
Old 3/12/06, 3:40 PM
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Russel Ray Russel Ray is offline
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Default Re: Warm spot in garage floor?

Major surgery is required. Call the jackhammer guys!
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  #15  
Old 3/12/06, 5:23 PM
rwand1 rwand1 is offline
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Default Re: Warm spot in garage floor?

Is it possible it is just a void? Did you try tapping on the floor with a light hammer to hear for sound difference. Would a void have a different temperature than surrounding cemment?
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