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  #1  
Old 1/21/14, 8:31 PM
Sean Fogarty's Avatar
Sean Fogarty Sean Fogarty is offline
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Default Line set under slab

First for me today.
HVAC line set wet under ground and under the garage coming out the wall on the opposite side.
What issues are associated with this? loss of energy? premature rot?






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Last edited by sfogarty; 1/21/14 at 8:38 PM..
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  #2  
Old 1/21/14, 9:30 PM
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Jeffrey R. Pope, CMI Jeffrey R. Pope, CMI is offline
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Default Re: Line set under slab

The biggest issue comes if the line-set ever needs replacing. If it's sleeved it's not that difficult. Absent a sleeve, the only real option is an exposed line-set - perhaps with a chase.

There are no "energy loss" issues (earth is an insulator) or "rot" issues (copper is allowed for direct burial) with underground sets.



IF YOUR INSPECTOR IS NOT USING THERMAL IMAGING, YOU'RE NOT GETTING THE WHOLE PICTURE
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  #3  
Old 1/21/14, 9:46 PM
Sean Fogarty's Avatar
Sean Fogarty Sean Fogarty is offline
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Default Re: Line set under slab

Thanks






Fogarty Inspection Services Group of Knoxville TN

Home inspections, Commercial Inspections, Thermal Imaging, Mold, Enviromental Testing and Radon Testing for Knoxville TN, Oak Ridge TN, Maryville, Clinton, Farragut, Lenoir City, Pigeon Forge, Sevierville and all the surrounding areas.

865-256-5397

www.homeinspectorknoxville.com

www.moldandradon.com

www.thermal-inspection.net

www.commercial-building-inspector.net
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  #4  
Old 1/21/14, 10:56 PM
Charley L. Bottger's Avatar
Charley L. Bottger Charley L. Bottger is offline
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Default Re: Line set under slab

Quote:
Originally Posted by jpope View Post
The biggest issue comes if the line-set ever needs replacing. If it's sleeved it's not that difficult. Absent a sleeve, the only real option is an exposed line-set - perhaps with a chase.

There are no "energy loss" issues (earth is an insulator) or "rot" issues (copper is allowed for direct burial) with underground sets.
Not a big issue if the lines beneath the slab ever leak and they do quite often we just run a new set up the side wall in a chase to the attic. The lowballers never use a chase just exposed lines looks like crap

Never say never with energy loss here is a pic from today's inspect it is a split system heat pump 2005 look at the line set and tell me what would be in your report my Calif friend.
Attached Thumbnails
line-set-under-slab-dscf1611.jpg   line-set-under-slab-dscf1685.jpg  



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  #5  
Old 1/22/14, 12:07 AM
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Jeffrey R. Pope, CMI Jeffrey R. Pope, CMI is offline
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Default Re: Line set under slab

Personally, I hate to see exposed lines. There's just no good reason not to use a chase, and your picture is a prime example of why - the insulation rots and reduces the overall efficiency of the system., especially if located on the "sunny side" of the home.

As for what I would report - I don't see any problem with the underground portion of the line-set, but the wall mounted section obviously should be re-insulated. In addition, I would recommend the insulation be protected from damage due to UV exposure.

What else am I missing?

P.S.

Out here in the big city, that unit is too close to the property line. I'm not sure if that's an issue out in the sticks



IF YOUR INSPECTOR IS NOT USING THERMAL IMAGING, YOU'RE NOT GETTING THE WHOLE PICTURE
Jeff Pope
JPI Home Inspection Service
Santa Clarita CA
(661) 212-0738
Santa Clarita Home Inspection
http://www.MyInspector.net



Last edited by jpope; 1/22/14 at 12:10 AM..
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  #6  
Old 1/22/14, 7:18 AM
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Default Re: Line set under slab

Quote:
Originally Posted by jpope View Post
Personally, I hate to see exposed lines. Me too There's just no good reason not to use a chase, and your picture is a prime example of why - the insulation rots and reduces the overall efficiency of the system., especially if located on the "sunny side" of the home. it was on the sunny side of the home

As for what I would report - I don't see any problem with the underground portion of the line-set, This being a heat pump I do have a problem with it being under ground its loosing some heat to the soil and between that and the draw thru indoor coil and one single trunk supply duct in the attic I was having some serious air problems with this system. but the wall mounted section obviously should be re-insulated. In addition, I would recommend the insulation be protected from damage due to UV exposure. Agreed

What else am I missing? Ya did good for a city slicker

P.S.

Out here in the big city, that unit is too close to the property line. I'm not sure if that's an issue out in the sticks Not a problem in the sticks because it is not considered a permanent fixture it can be moved



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  #7  
Old 1/22/14, 10:01 AM
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Jeffrey R. Pope, CMI Jeffrey R. Pope, CMI is offline
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Default Re: Line set under slab

I keep forgetting that you folks use heat pumps

Only a very small percentage of our systems are heat pumps. Gas-fired, forced air furnaces are so much more efficient and effective



IF YOUR INSPECTOR IS NOT USING THERMAL IMAGING, YOU'RE NOT GETTING THE WHOLE PICTURE
Jeff Pope
JPI Home Inspection Service
Santa Clarita CA
(661) 212-0738
Santa Clarita Home Inspection
http://www.MyInspector.net


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  #8  
Old 1/22/14, 4:58 PM
Charley L. Bottger's Avatar
Charley L. Bottger Charley L. Bottger is offline
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Default Re: Line set under slab

Quote:
Originally Posted by jpope View Post
I keep forgetting that you folks use heat pumps

Only a very small percentage of our systems are heat pumps. Gas-fired, forced air furnaces are so much more efficient and effective
No argument on that from me



http://www.oklahomathermalinfraredimaging.com/
http://www.freedomexpressinspections.com/
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Residential/Commercial Inspections
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  #9  
Old 1/22/14, 6:28 PM
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Marcel R. Cyr, CMI Marcel R. Cyr, CMI is offline
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Default Re: Line set under slab

How about equipment pads, flashing and weep holes above grade? Insulate the pipes properly and have the HVAC serviced.
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  #10  
Old 1/23/14, 2:48 PM
Charley L. Bottger's Avatar
Charley L. Bottger Charley L. Bottger is offline
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Default Re: Line set under slab

Quote:
Originally Posted by mcyr View Post
How about equipment pads, flashing and weep holes above grade? Insulate the pipes properly and have the HVAC serviced.
Hey buddy what does weep holes and flashing have to do with a HP



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  #11  
Old 1/23/14, 5:36 PM
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Marcel R. Cyr, CMI Marcel R. Cyr, CMI is offline
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Default Re: Line set under slab

Don't know, I thought since I don't know sh$t about HVAC to speak of, I point something out that I know.
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  #12  
Old 1/23/14, 8:29 PM
Charley L. Bottger's Avatar
Charley L. Bottger Charley L. Bottger is offline
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Default Re: Line set under slab

Quote:
Originally Posted by mcyr View Post
Don't know, I thought since I don't know sh$t about HVAC to speak of, I point something out that I know.
Sounds like your on the right track but if you sit still your bound to get run over.

I think Will Rogers said that

Come run with me I teach ya HVAC and you can teach me boards and ya may have to hit me with one



http://www.oklahomathermalinfraredimaging.com/
http://www.freedomexpressinspections.com/
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Level III Thermographer # 8486 Infraspection Institute
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Residential/Commercial Inspections
Moisture Intrusion Expert Witness
580-268-3340
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