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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.
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LEGALETT Approximate
Relative Cost Compared to Conventional |
|
| 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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