The Legalett GEO-Slab (Frost Protected Structural -Shallow Foundation) Slab on Grade System Is Essentially Two Building Systems In One...

 

The Foundation AND the optional Air-Heated Radiant Flooring System.

 

​Legalett's GEO-Slab System

 

Warm Floors and Mold/Mildew Free Foundations with Legalett Shallow Foundations & Air-Heated Radiant Floor Systems - Promote Healthy Indoor Air Quality and a Healthy Living Climate.

 

The Foundation is the Engineered Structural Concrete Slab

 

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● It floats on a double layer of rigid polystyrene.

●  It rests on a well-drained layer of crushed stone.

● The Slab On Grade design is engineered for frost protection.

 

 

The heated floor system is a network of pipes from a furnace box that is cast in the slab

 

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● It distributes the heat from the heating source evenly throughout the house.

● There are no drafts, cold areas or hot spots.

● The heated slab will typically be a couple of degrees above the ambient temperature of the room.

● It will gently radiate its energy to the occupants of the building in a low intensity, comfortable, efficient manner.

● The slab can also passively absorb energy from the daytime sun and distribute it at night, reducing the amount of purchased energy required.

 

The slab is always warmer than the soil and crushed stone.

• Thus moisture migrates downward and away from the building.
• The warm slab also inhibits static electricity and dust formation.
• Dust is further reduced when filtering the incoming and any re-circulated air.

 

Warm air can be blown through the slab immediately after it is poured using a construction heater allowing extension of the construction season.

• The slab dries out quickly.
• Breeding places for molds and fungi never occur.

 

All functions of the system are controlled by simple wall mounted controls.

• All mechanical components, including the single moving part (the fan), are contained within the furnace box, which sits flush with the slab surface and is easily accessible.

 

 

Components of the Legalett System:

 

Slab:

 

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• Provides the structural integrity.

• Provides the enormous heat sink that is used to buffer the interior temperature of the structure.

• Reinforced to carry loads of interior and exterior walls, as well as roof.

 

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Edge Elements and Insulation:

 

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• Provides the durable and decorative exterior covering.
• Provides the stay-in-place formwork.
• Provides the insulation to insulate the slab from the outside elements.

 

 

Furnaces:

 

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• Heats the air, which circulates through the system.

• There are two general types;

• Water Coil Units
• Electric Units

 

Water Coil Units

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● Very simple in design.

● Contain a water/air heat exchanger to distribute the heat from the heat source (hot water tank, boiler, etc.) to the air in the pipe system.

● Contains a fan to move the air.

● Simple thermocouple turns the fan on and off as demanded by the supply of hot water to the unit by the thermostat.

● Uses internal valving for control, as well as the external heat source to provide the heated water.

 

Electric Units

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● Contains electric heating elements and a fan.

● Simple in overall function.

● Only requires electricity to heat the air directly with the heating elements.

 

Heater Unit Control

• Up to 2 heating zones per unit.
• Simple wall mounted programmable thermostats.

 

All moving and mechanical components are contained within the furnace box.

 

Furnace boxes can be easily opened and accessed for maintenance, as required.

 

Piping

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• Choice of 2” or 4" diameter pipe.

• Closed loop piping carries the warm air throughout the slab system.

 

No outside air enters or leaves the system.

 

No air is blown around in the living area of the house by the LEGALETT System.

 

Drafts and overall air movement is reduced to simply what is required for healthy ventilation as   provided by a heat recovery ventilator or similar system.

 

Basement, frost wall, 2nd and 3rd storey applications are all possible!

 

 

• Quick Links:
• Installation Overview of Legalett's Frost Protected Shallow Foundations & Air-Heated Radiant Floors
• GEO-Slab
• GEO-Passive
• GEO-Basement
• GEO-Pad
• Air Heated, In-Floor Radiant Heating
• Accessory Products for the Legalett System
• Benefits of the Legalett Frost Protected Shallow Foundation & Air-Heated Radiant Floor System

 

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