Energy Efficient Building Solutions,

From the Ground Up

geo-slab, slab on grade Insulating concrete forms, Incorporating air heating & cooling solutions - Design & Installation

Frost Protected Shallow Foundations, incorporating Frost Protected Footings Design and InstallationInsulated slab on grade concrete forms are a tried and tested alternative to more costly deeper conventional foundation designs used throughout the USA, especially on poor soils, infill soils or . GEO-Slab slab on grade systems by Legalett provide engineered slab and foundation insulated forms in both heated / cooled and unheated slab designs for both structural integrity on poor soils & a rapid installation & build. The proven design allows footings to be placed above the traditional design depth, & insulates the foundation and ground to keep the internal temperature of the structure naturally stable and make best use of the thermal mass of the concrete used.

The earliest documented use of an insulating slab on grade concept in the United States was by Frank Lloyd Wright in the 1930’s. In 1994, the US Department of Housing and Urban Development conducted several demonstration and monitoring projects, to verify the performance of existing European design practices. As a result a Design Guide was developed, to serve as a basis for building code acceptance and standardization in the States by the National American Home Builders Research Center.

In Nordic countries also, this type of integrated insulated monolithic floor slab and foundation construction is extensively specified & well over a million FPSF’s or Frost Protected Shallow Foundation Systems have been constructed successfully over the last 45 years. In Scandinavia, for example, the Frost protected shallow foundation systems are commonly used on both residential and commercial buildings, such as houses, townhouses, apartments, shopping malls, schools, low-rise office buildings, restaurants, gas stations, etc. FPSF’s have been the preferred method for frost protection of foundations and slabs since the 1970’s. In Florida's warm & variable climate - an insulated and heated / cooled slab still makes sense as a method of reducing year round energy costs and increasing comfort levels in the home - as well as it's future resale value and as part of a LEED certified construction. See what Wikihow has to say about designing a home that stays cool in Florida


Traditional Foundations & Slab's are slow and become complicated to build when insulated with their thickened edges and skirting details, and require careful attention to design detail to ensure satisfactory performance. Traditional foundations and slabs generally require extra time, expense, materials and machinery because they are placed deeper in the ground to ensure them sitting on an undisturbed compacted soil giving the long term stability required for a problem free home or building. As heating and cooling costs increase and as environmental considerations become more prevalent, Building Codes become more stringent & with the advent of building certifications like LEED and Energy Star the use of insulated foundations and floor slabs is becoming the norm. Whilst it's perfectly possible to buy standard insulation in it's many forms and incorporate this within a traditional foundation and slab design - because it's demonstrably easier, it's becoming much more widely accepted to use a Slab on Grade ICF product - to provide a mono-pour solution that effectively meets higher building standards at a lower or similar cost by allowing economies of time, labor and materials. If the build is on poor soils, infill soils or Expansive Soil and Expansive Clay - Using a floating GEO-Slab ICF form should be your first choice, every time.

GEO-Slab by Legalett is a unique approach in designing and engineering an insulated slab on grade foundation and can even incorporate a forced air heating / cooling system specifically designed to be part of the highly insulated structure without the possible failures & issues endemic in a water-filled In-slab hydronic heater. By combining a slab on grade foundation and the heating system, GEO-Slab shifts the bulk of the concrete away from the edge, and spreads it evenly through the insulated slab, maximizing the thermal mass of the slab for heating & cooling benefits, and evening out the load applied to the soil. This simplifies the installation of the GEO-Slab system, compared to other ICF’s, in two ways - the GEO-Slab is the same thickness from one side of the building to the other, reducing installation time and cost by eliminating thickened edges and multiple concrete pours, and secondly, by reducing or eliminating the need for exterior insulation skirting. A GEO-Slab on grade shallow insulated foundation pour with incorporated air heating system in Canada can be seen here...

The GEO-Slab is simpler to install, quicker and hence cheaper and more energy efficient than traditional foundations. To put it simply, 

  1. Prepare the site by levelling it, and install and compact a thin stone base to improve drainage.
  2. Install the precut & engineered lightweight GEO-Slab ICF forms
  3. Install the heating pipes (if applicable)
  4. Pour your concrete.


Remember, GEO-Slab is delivered with over 30 years experience behind it, and there are currently Over 20 Million Square Feet of GEO-Slab Radiant Floor Heating Systems Installed Worldwide.

Get things moving - find out how great, easy and cost effective it is to utilize GEO-Slab insulated slab on grade foundations for your next project - Contact Core in under a minute here and Get an initial Free Consultation or Quote. 

 Get my Free Quote or Consultation


State of the Art Frost Line Behaviour Modeling

Legalett engineers use state of the art Finite Element Modeling for heat transfer to predict the frost line.


  • Saves time, materials and money. 
  • Save on excavation, no more guessing about soil problems or hidden rocks, because GEO-Slab Insulated Shallow Foundations sit on grade.
  • No more crawl space issues.
  • All concrete pouring is completed at once with the Legalett structural insulated slab - Reducing construction time and costs.

The GEO-Slab insulated structural foundation by Legalett is ideal for back walk-outs, poor soil conditions, lots with high water tables. NOTE: It is all the same recommended that the top of the slab be a minimum of 20” above the ground water table.

From a slab on grade to fully buried structures and foundations - Core Construction Products supplies GEO-Slab heated and non-heated structural slabs from Legalett for both heated and non-heated buildings.


Get a free quotation for GEO-Slab Insulated Shallow Foundation System by Legalett quickly here Contact Core in under a minute here and Get an initial Free Consultation or Quote. 

 Get my Free Quote or Consultation


Frost Protected Shallow Foundation On Grade Below Grade Basement


The Advantages of Construction using Air-Heated Floors from Core Construction Products
  • Air is a safe and reliable heating medium 
  • Save on construction costs
  • Save on energy costs every year
  • Extend the building season in cold climates
  • Eliminate the risk of moisture damage and leaks from water filled heating pipes 
  • GEO-Slab by Legalett is the foundation for a healthy, durable and cost effective Green Home Construction.

Unique Advantages

Warm air is recirculated through a closed loop piping system from a heater cast in the floor slab. The building envelope is completely insulated. GEO-Slab uses expanded polystyrene as stay-in-place formwork and under-floor insulation in a single operation. The slab-on-grade GEO-Slab system by Legalett costs less than conventional construction. The air you breathe is separate from the air used for heating so household odours are reduced and moisture, mould and mildew are eliminated. The heater box is insulated for quiet operation.

Very cost effective and reassuringly simple...  The GEO-Slab system is both healthy, affordable and ecologically sustainable.

With GEO-Slab, the heat comes from the floor eliminating drafts - feet are warm and any moisture is quickly and easily evaporated from the flooring surface. Even the bath mat dries quickly after showering avoiding that musty smell we all know in the bathroom!

GEO-Slab by Legalett is a PATENTED SYSTEM

Hot water and electric floor heaters have been available and accepted in North America for many years. Legalett have improved on traditional home heating, for example in the hot water floor heater, water is heated by the building hot water system and circulated to the GEO-Slab heater where the efficient exchanger system heats the circulated air system.  The alternative electric heater takes advantage of tiered electricity rates.  

The GEO-Slab system can:
  • be used for any building
  • be adapted to any energy source
  • regulate heat in different zones 
  • accommodate all floor coverings - ceramic, hardwood, carpet, linoleum
  • provide for barrier-free buildings (handicapped access)
  • be used below, on and above grade

Core Construction Products helps provide the design and supplies all components, for simple and cost effective installation, following the building process from concept to move-in.

Legalett's GEO-Slab slab-on-grade foundations eliminate footings and foundation riser walls.

When working in a cold climate as found in central and Northern America, or central Canada, use of GEO-Slab's construction heater extends the building season, cast in place with a removable cover for easy access. CCP supplies GEO-Slab by Legalett air-heated floors for residential homes, retirement homes, schools & daycare facilities, churches, commercial & industrial buildings.

There is always a GEO-Slab on-grade insulated shallow foundation design that works!  - Contact Core in under a minute here and Get an initial Free Consultation or Quote. 

 Get my Free Quote or Consultation ► 

To watch a video of a Heated Insulated GEO-Slab Slab on Grade Shallow Foundation construction pour in Canada, click here.

To find out more about Frost Protected slab on grade construction systems in Colorado or the Western US, click here

Call Us for:

Green Building News

Follow us

Follow us on Facebook Follow us on G+ Follow un on LinkedIn Follow us on Twitter Core Construction Products on YouTube