How to thermally UNCOUPLE your concrete slab.
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- Опубликовано: 22 авг 2021
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Jake talks foundation details of this slab on grade home. He shows how to thermally uncouple from the ground and perimeter. 
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A stone countertop that feels colder is not “emitting temperature back to you”. What is happening is the stone is taking some heat from your hand via conduction. Stone at room temp 72F is colder than your hand (somewhat under 98F). Heat moves from hot to cold or rather from more to less. Temperature is a measure of heat. It doesn’t get emitted. Cold is the absence of heat so it also doesn’t emit.
Insulation does not "uncouple". It just delays the thermal transfer for an hour per inch. 6 inch foam delays heat transfer by 6hrs. By morning, an insulated house without heating is EXACTLY the same temperature as outside. Then it will take 6hrs to heat up again
"We can't completely solve that issue" - actually you can if you put hydronic heating into the slab. Can't beat the comfort and energy efficiency of underfloor heating.
True but he said it was a rental so this is a cheaper method. I think that's what he meant
Did you continue the same details under door openings? I can see some form work in the video that appears the details may change under the door threshold.
Do you tie the slab to the footing or stem wall with a cold joint? Getting ready to do something very similar here in NC.
Jake!! Come build in south Johnson County Kansas!!
I understand the footing but would like to know is how deep is your footing pour not including your 2x10s.
Thank you!
same question..hope he responds
Frost depth
So the takeaway is that by insulating a slab-on-grade in the prescribed manner, substantial heat savings and comfort gains may be had prior to taking the next step of intalling in-slab hydronic heating.
So how high do you run the sidewall insulation? It looks like they have concrete all the way to the footing.
Jake, is a perimeter French drain added to this foundation? How does one go about installing that with the “trench forming” method?
Simple!!
I've got a house with a bomb shelter for a basement, a 6" slab covers the entire basement with 2x6 on sleepers and 1-1/2" of plywood for the first floor deck over the top of that. The first floor deck gets cooold in the winter and I need to remedy that in the near future.
I am wondering if I could remove the first floor deck, add 2"-4" of foam insulation to the top of bomb shelter/basement cap and then pour the remainder in 4"-6" of concrete?
I didn’t know ACI had pumps still going a year ago? Or has someone bought that 46m and not re-stickerEd the truck?
So the outside concrete is load bearing from the walls and it is not connected to the slab? Would not it be weakened compared to solid foundation?
Not really, the footing is what holds the weight
Did I see in floor heating?
I unserdtand decoupling the edge of the slad as the concrete edge is exposed to the weather, in this video negative 9 degrees. What i am struggling with is the necessity in insulating below the slab due to the average earth temperature under a slab being 55 degrees. it seems like there is not much bang for the buck because that 2 inch eps is expensive.
You are still getting a minimum -15 delta that you will loose heat 24/7 365 days a year!
I thought the idea might be that the temperature of the ground next to the foundation is cooled significantly by heat transfer through the foundation and heat transfer from the ground outside the foundation.
@@imwteach I'm not sure a 15 degree delta is worth the cost or trouble. The wall insulation is battling a 50 dgree delta so that cost makes sense.
@@kevinmickelson5128 Still, a 15 degree delta over the life of the home makes it worthwhile to insulate. After living in our current home for 12 years with in slab radiant heat I wouldn't have anything else...I also wish I had placed more insulation under the slab. I currently have 2" of Styrofoam and should have gone 4 or 6!
Insulating foam glass aggregate such as Aeroaggregates will not breakdown like a petro-chemical foam... and allows drainage so it replace most of the stone aggregate...
I’m in climate zone 2 so really nobody insulates slabs, but I have concrete floors and the west side of the house has a concrete porch that is connected and you can definitely feel the heat come through the slab if you’re barefoot. My question is this though. Is there a way to pour the slab all at once and insulate? I can just imagine the look from my concrete subcontractor if I told him we were going to pour separate days…
Build with Insulated Concrete Form blocks and you solve several problems at once
Have the contractor add the depth of your insulation to the total outside measurements and add the insulation to the inside of the form. I also added large screws into the foam to couple the foam tot he concrete. That’s how I did a frost protected shallow foundation. Super easy.
@@bpdp379 I plan to do the same thing. May I ask, did you use a “protective coating” outside of the insulation? If so, what did you use?
@@billwilljulz not below grade. Above grade I did add a flat stock metal flashing to protect the foam from UV light and physical damage like weed whackers and such.
That was added after the pour.
A lot of words for... insulate bottom and sides.
Now how do we seal the foundation from water and ice?
Basically turns the slab into an energy battery..
15 mil poly membrane then a 2" closed cell insulation (taped) then 4 inches of concrete. I like the insulation but shouldn't the footers be insulated too?
What happens when the bottom foam gets squished into a pancake? Not much insulation then.
You just have to have a crawlspace or need some other substrate...under the slab.
I was wondering about this myself -- would like to hear the Build Show address this.
CS(10/Y) - amount of pressure needed for 10% deflection of average XPS is ~ 300 kpa = 300 kN/m² = 30 t/m².
Unless your main building material is lead you would be having hard time "squishing it into pancake".
Will never happen
This is an issue for certain types of foam, but xps should be able to take the weight.
@@Superwoodputtie Thanks for that info gentlemen. very useful info.
only reason I was against slab was that... cold plus moisture... if those are resolved, I am sold to the idea.
do elaborate on exactly what type of XPS is best suited... please.