Slab foundation / Discussions

Geothermal and slab on grade - which is the best mechanical option for heating and cooling?

...slab-on-grade house using ICF walls and SIP roof.  We are trying to decide on the best mechanical options that would address heating and cooling and be integrated with a geothermal loop.  Any suggestions would be great.  Thanks

Posted by Paul Heyer May 17, 2025 Heating and cooling

How do you run ducts for heating and cooling with slab on grade construction?

...slab on grade foundation - or frost protected shallow foundation - is a great alternative to a standard foundation, and they work in all climates, contrary to what a lot of people think. This page is a great start for all things slab related - How to buid a slab on grade foundation - the Ecohome A to Z guide You open u...

Posted by Kurt Piemonte April 24, 2025 Slab on Grade 1 response

What are the best below grade drainage layers for a slab on grade foundation?

...slab on grade foundation starts with building it on a suitable base that won't heave and that has sufficient drainage. First I would read this page - How to build a slab on grade foundation: the Ecohome step by step guide We can advise you on the best practices for building a slab on grade, but you would still need a d...

Posted by stephan prystanski April 7, 2025 Slab on Grade 1 response

What's the ideal concrete thickness for concrete slab floors?

...Slab Foundation: This concrete floor is not intended as a structural slab foundation. Should I directly design it as a traditional slab foundation? In this case, the thickness would be around 4-to-6 inches. Floor Sandwich Structure: I'd like to understand how the layers of the floor system should be structured for this...

Posted by Abdulkadir Al-Jazari March 28, 2025 Basements

What is the proper way to build a Slab on Grade Foundation?

...foundation uses 'insulation' as insulation instead, read more here on our slab guide page - How to build a slab on grade foundation in a cold climate and prevent frost heave Wyoming is a cold climate for sure, but there are much colder climates with slabs that never had a problem. what is missing from the equation in w...

Posted by John Schureman March 25, 2025 Slab on Grade 3 responses

Crawl space versus slab, which is better?

I am in the early stages of planning a new home build. Am I correct in assuming that slab on grade constuction with passive floor heating would rule out the use of a heat pump. Also I would question your depiction of crawl spaces as damp and moldy. In a previous house I built with ICF walls the crawlspace was warm and ...

Posted by Doug Bennett Jan. 5, 2025 Foundation and basement improvements 1 response

How would you do a Slab on Grade with a post and beam garage in New Hampshire?

...slab on grade raft slab which only requires digging 6 inches down to remove the organic layer as it is all built on a flat surface with no thickened edge footing needed. Raft slabs distribute the load of the building evenly over the whole surface. The page linked above is an example of just such a slab.   

Posted by Robert Nordman Jan. 19, 2022 Slab on Grade 1 response

What are the pros and cons of building a house on a slab on grade foundation?

...slab still be in tact? What happens if the slab cracks and part of the house tilts? Here you have lots of old houses on basements that are still standing. With a basements you can redo basement walls, easily get to plumbing etc. With a slab what happens when a pipe breaks in the slab? How can you even find leaks? What ...

Posted by Debra Kroening Jan. 5, 2022 New foundations and slab-on-grade 6 responses

What is the best way to build a slab on grade foundation?

...slab this slab it really needs an experienced engineer, so I would check with your engineer that this is within their wheelhouse, if not I would look into a company that specializes in providing engineered slab on grade prefab kits where point loads are all considered and engineered for you, as well as skirting.  

Posted by Earl Williams Nov. 30, 2021 Slab on Grade 3 responses

What is the best way to install slab on grade insulation?

...slab EPS foam insulation is nothing compared to the labor required to switch to an entirely different method of insulating. I would first point you to this page -  Slab on grade technical guide We have other pages on slab construction as well that are worth looking at, you can find them if you enter slab on grade in th...

Posted by paul fowler Aug. 26, 2021 Slab on Grade 3 responses

What do we look for when buying land and coming up with a house building budget?

We want to build an eco home in the hudson valley. We are not sure where to start on finding land and coming up with a suitable budget. We would really appreciate advice either for where to start or for a company that might be able to work with us. This is our first time building a home. There is a lot to think about w...

Posted by stephanie p July 3, 2021 Planning and Design 1 response

What is the best method of building a slab on grade?

...slab will heave, crack, etc.  Also, do you have a list of foundation contractors who have experience with building these slabs? Having built several LEED certified High performance homes on slabs with different methods, our preferred method on how to build a slab on grade would be with an engineered prefab raft slab ki...

Posted by Jay Law April 19, 2021 Slab on Grade 1 response

Can I use a Legalett slab in Florida if I don't want floor heat?

...foundation supports the house evenly and did not need a lot of fill dirt. What is my best option for cost and energy savings? should I just use a stander slab, or do you have something like this without the heated floors that would work better? A Legalett raft slab has an optional air heated radiant floor, but it is no...

Posted by Harry Dickinson March 25, 2021 Slab on Grade 1 response

How do you determine the thickness of concrete for slab on grade construction?

...slab you may be bettter with a raft slab that spreads the weight evenly over the whole surface. But for your general knowledge, here is our guide on slab foundations -  Technical guide on how to build a slab on grade foundation  It is more than the thickness of concrete that will determine its structural integrity, it ...

Posted by Ackeem Beason Feb. 16, 2021 Slab on Grade 1 response

How much perimeter skirt insulation should go around a concrete slab?

...slab w/ 2" hard foam insulation under slab (+ crushed stone & eps vapor barrier), and 2" hard foam insulation vertically around sides/edges of slab and subfloor above.  On top of the slab will be a wood subfloor web-truss system where the electric & plumbing & hydronic floor heating panels w/ PEX tubing wil...

Posted by Insinuendo Insinuendo Aug. 5, 2022 Slab on Grade 3 responses

What is the minimum insulation value for insulation between the edge of the slab and foundation wall?

...slab foundations and homes, I would first check our BC Step Code made easy page for information on that. Building codes vary too much between states, provinces and even cities for us to keep up with unfortunately.

Posted by Arsh Deep July 12, 2022 Slab on Grade 1 response

Is an engineered slab on grade as good as a foundation footing?

...slab on grade so that there is no shifting with frost. Is this not the case anymore. Is a slab on grade the best practice? An engineered slab on grade that has been designed for it's climate is as reliable at preventing frost heave as a foundation and footing. We are creatures of habit, and we have always *known* that ...

Posted by Jeff Ryan Feb. 15, 2022 Foundations and Basements 1 response

Can you replace an old slab foundation with an air heated slab?

...slab on grade house and pour a new slab under it, unless of course I’m missing something here. The raft slab insulated slab on grade kit with the air heated radiant floors is intended for new home construction, though you could raise a house and build a basement with one.  So – on the off chance you have a crawlspace a...

Posted by Mike Molloy Nov. 7, 2019 Slab on Grade 1 response