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Air Heated Slabs vs. Traditional Construction
A Retail Cost Comparison

The following graph compares costs of an installed Legalett System to other construction methods, starting with undisturbed soil, and finishing with a slab or floor above finished grade ready to construct walls on, including the heating system.

ITEM / COST

LEGALETT Approximate Relative Cost Compared to Conventional

REASON

Excavation 1/3 Simply stripping topsoil - no deep excavation
Stone Drainage Layer 2/3 Simply placing 4” (100 mm) clear stone on level surface
Backfill Eliminated LEGALETT does not require backfill - only landscaping around the edge element

Footings
Eliminated LEGALETT does not require footings
Frost Walls Eliminated LEGALETT does not require frost walls
Footing Drainage Eliminated LEGALETT does not require footings
Sump Pump Pit Eliminated Slab is above water table
Concrete Slab Eliminated 8” (200 mm) slab included with LEGALETT
Additional Underslab
Insulation
Eliminated 6” (150 mm) underslab insulation included
with LEGALETT
Heating System Eliminated Included with LEGALETT
Additional
Engineering
Eliminated Included with LEGALETT
Operating Cost Lower Improved insulation, ability to decrease average room temperature, ability to take advantage of off-peak energy rates.

Notes:

Slab-on-Grade with Hydronic is an engineered thickened-edge slab-on-grade foundation using a boiler-based hydronic heating system.

Slab-on-Grade with Forced Air is an engineered thickened-edge slab-on-grade foundation using a forced air heating system.

Frost Walls with Hydronic is conventional construction with frost walls supporting a slab using a boiler-based hydronic heating system.

Frost Walls with Forced Air is conventional construction with frost walls supporting a slab using a forced air heating system.

Full Basement with Forced Air is conventional construction with a basement and first floor (finished to the subfloor level) with the basement walls finished to the minimum (Ontario) Building Code requirements, with a forced air heating system.

Crawl Space with Forced Air is conventional construction with a crawl space and first floor (finished to the subfloor level) with the crawl space walls finished to the minimum (Ontario) Building Code requirements, with a forced air heating system.

 

 
 

 

       
 
 
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