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After the initial pour in November it lived under blankets all winter which I think gave it enough time to properly cure. This last winter was its third, with the last two being heated. I haven’t had any problems and everything seems to have worked just fine.

Don't forget you can (and should) go with a lighter gauge for an interior liner panel. Less cost and weight since you don't need the structural sheer benefit from a thicker gauge. I used Fabral interior on my shop and it was about 20% less than exterior panels at the time.

To be fair to the quote, it includes the insulation and wire mesh which will be needed regardless of source of heat. 2" of XPS foamboard is $54 for 32 SF at the orange store. So you'd need a minumum of 75 sheets which is $4000 just for the material. If you are slightly handy and have free time...

I am avisual learner, s this helped me the most...

Do a search for LoopCAD software. It comes with a 30-day free trial and you will get your heat loss, tubing layout, flow rates, temps, etc. all in one software package. As for the tubing location, my answer is there is no clear answer. Every method has it's advantages and drawbacks. Disclaimer...

Even their natural gas is very high. Last time I looked my electric is still cheaper than their gas per mil/BTU. I have no idea what LPG must run. But the weather is nice...:rolleyes: BIg lesson here for everyone is you need to compare your own actual utility rates to see what is best. Three...

Just checked with my in laws in SF Bay Area, peak time PGE is $.42 for delivery and another $.16 for generation for total $.58 per kWh… off peak is $.24 and $.12 for total of $.36 delivered….

I was just giving you a data point. My ambient temps were 10F daytime so a Delta T of 30F was all it could do. You have the advantage of higher ambient temps. I think the system isn’t working correctly though… Okay taking your follow up info I believe your floor (I’ll call it secondary) loop...

If it was my system, I’d close the valve at the closely spaced T’s and within two minutes if the supply manifold the temp gauge goes up, you know that’s the issue.

I agree with @like2wheel the ”secondary” loop feeding the floor is not pulling anything from the “primary” boiler loop. If temps on supply and return are identical, and matching the ambient, the floor is recirculating the same fluid over and over.

You still have no insulation In the building. For comparison I have a 40x60 like you. It’s 5” thick with 2” XPS under, 3” at the perimeter going 24” down and 24” horizontally. I turned my system (18K Thermolec boiler) on when the slab was 10F to warmup the building as much as I could to help...

Go to the coal pail site and use the calculator to decide what costs less for your particular situation...here my best price is actually electric. We are right near hydro generation and pay a tiered rate between $.06 and .10 based on usage. My main beef with propane is the wild fluctuations in...

I have zero experience with it and am not recommending it, but Rockwool Comfortboard 80 is listed as suitable for under slab use. I think they started certifying it about a year ago. https://www.rockwool.com/north-america/products-and-applications/products/comfortboard-80/ Oops, just noticed...

Thanks! That helped a lot.

I got ya, I am the OP and it may have been confusing because I was trying to see if a FPSF designed for a heated building would be okay for a period of time in an unheated condition. My concrete guy insisted it'd be okay due to the well-drained rock that was used for the pad, therefore no water...

I am clear on all that, however I have only seen the circulator "pulling" from the other loop and not "pushing" into it. Both circulators are making positive pressure at the T and neither one is creating negative pressure at the T to allow it to work? Hasn't it created this issue? Again, I do...

Thanks! I had not seen the 3-27 method before. So his primary loop is the one going to the loops and the secondary is drawing from that to feed the boiler? Is that less effective then the other method? I know on mine the primary is for the boiler because it needs a minimum GPM far in excess of...

R403.3 Frost-protected shallow foundations. For buildings where the monthly mean temperature of the building is maintained at a minimum of 64°F (18°C), footings are not required to extend below the frost line when protected from frost by insulation in accordance with Figure R403.3(1) and Table...

Hope I am not hijacking here, but aren't the pumps fighting each other? For the primary/secondary to work, shouldn't the secondary pump be pulling from the primary at the closely spaced T's? I am learning about P/S so don't know what I don't know.... I just have never seen the secondary...