Radiant basement

KAG

But what about the slab being that there is NO insulation underneath won't this steal alot of heat. If during the day there is alot of solar gain in the room and No slad sensor when the sun goes down won't it take a long time for room to recover?

KAG

Radiant in basement

I went to a house today to look at radiant heat options.
This house is a post and beam custom home. HO asked me if radiant should have been installed into slab before they poured floor. I said yes. Here is what I see as problem in future.
#1 They did not insulate underneath slab before they poured
#2 Walk out basement sliding glass doors set for finish height (1" above slab height).
#3 HO wants low heating costs with warm floors.
#4 House is high efficient built (green house building)
#5 HO does not know what building contractor's heating Co. is doing to meet their requirements.
#6 Builder recommends that they use Quik-track on top of slab no insulation below

I told HO that the slab beanth would steal alot of heat causing possible problems with basement zone (ie unable to heat). I told HO I need to do heat loss first then we will see what they need.

Was I wrong about heating problem, I believe that you are going to have to heat the slab before you can heat the room. If I am wrong please let me Know?

Contractor

If they are putting the quik track above the concrete pour you must use a vapor barrier then put some plywood down or you can put the quik tracks directly on top but the finish floor must be floating, yourlooking at over 1" either method assuming 3/4" hardwood is being used, i dont think you can float a floor with tile.

as for using the in slab radinat, this would be the way to go but make sure that you insualte a few feet in from the outside walls and on the side. i assume this basement is below grade (at least some of it) so that will help with the insulation not being placed fully underneath but you do need a vapor barrier. Either application is going to run no more than 120* water maybe alot less depending on what they want the temperature to be and the floor covering.

Unknown

the answer to all of

The answer to all of ur questions is CAST IRON BASEBOARDS.. I ran into similar problems you have, with cast iron baseboards on wood strips, homeower can do whatever they want with the floor covering and still achieves the comfort needed in that area...

hr

pad and carpet

the slab for some r-value, then install radiant ceiling

hot rod

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Unknown

HR is right on. If it's low load/green building, the floors wouldn't be all that warm anyway.

Joe_75

I looked at a job that had gyp poured over an unisulated slab. Never did work well and the boiler ran constant. I also saw one with BCI's and staple up over an unisulated slab with no isulation or reflective barrier, it woked ok above 50 degrees.