1. Legalett’s North American Head Offices are located in
Cornwall Ontario where a group of dedicated men and women
from three engineering disciplines (geotechnical, mechanical
and structural engineering) work out optimum engineering
solutions for each individual GEO-Slab project (Frost Protected
Shallow Foundation). From small additions to multi-storey
commercial, multi-unit residential or community centers, there
is no project that is too big or too small for us to handle.
We are experts in our field and have provided cost
saving engineered solutions for construction projects all over
North America and beyond.
Designed for Comfort, Engineered for Simplicity
2. Point Loads of up to 100,000 lbs. can be accommodated
within the thickness of a typical GEO-Slab, eliminating the
additional excavation and concrete normally required.
Low bearing capacity soils or landfill
Expansive Soils by using our below grade water shield design
Permafrost
Seismic control
Vibration or sound control foundation requirements often
required when building near railway lines.
Designed for Comfort, Engineered for Simplicity
3. Legalett’s low maintenance heated GEO-Slab will provide years of
comfortable radiant heat and is designed to work with off peak hour
energy billing.
No intrusion into high water tables or undermining the roots of
mature trees
Prevention of Radon Gas and moisture migration into the building
through the GEO-Slab foundation.
Cisterns for rain water or fresh water can be placed below GEO-Slab
Designed for Comfort, Engineered for Simplicity
4. The GEO-Slab provides the foundation structure for the
building at much reduced soil loadings than traditional
footings, allowing opportunities for building on low-lying areas
and poorer quality soils not normally suitable for conventional
construction.
We achieve all this by designing a GEO-Slab, a Frost
Protected Shallow Foundation (FPSF) that structurally behaves
as a two way raft foundation resting on soil that is modeled as
an infinite set of springs.
Designed for Comfort, Engineered for Simplicity
6. Unheated/Heated
Space Requirements
(note the extended
skirting at this location)
Design Specifics
AFI 1000
Latitude 45.1
Longitude 75.23
100YearWinter
No Snow orVegetation
Cover
Designed for Comfort, Engineered for Simplicity
11. 1- a base of ¾” clear stone is put down
2- plumbing and utilities are roughed in
3-stone is leveled and 9” GEO Foam is put down starting 1-2” beyond the foot print string lines
4- perimeter chalk lines are applied to the 9”GEO Foam base
- the GEO-Passive edge element is then glued and pinned down at the chalk lines
5-Stego vapor barrier is applied over the entire base extending out beyond the edge elements by 12”
-this is then covered by a layer of 3” GEO Foam in the area between the edge elements
6-Reinforcing steel is installed
1 2 3
4 5 6
12. Some of the special details to be considered
At one outside edge
of the building was
the elevator pit
which was also
designed as part of
the raft slab. The
turned down rebar
will connect the pits
walls and floor to the
slab yet to be
poured
Elevator Pit
13. Some of the special details to be considered
Cisterns
2 sump pits were installed adjacent to the elevator pit independent of the GEO-Passive Slab.
A High water table and poor soils required designing the slab for less then 65 kPa conditions
14. Some of the special details to be considered
-Stego Moisture Barrier had to
be protected from puncturing.
-Any punctures had to be
repaired before concrete was
placed
-Many slab penetrations to be
sealed
-Placing the top 3” layer of
EPS over the Stego protected
the majority of it from damage
15. Some of the special details to be considered
Many Embedments
16. Legalett site support was ongoing throughout the project and a full inspection
of the work performed was undertaken prior to placement of concrete
17. Concrete is placed using an over head pump.
Slab must be kept wet for
a minimum of 3 days in
order to reach design
strengths and to prevent
cracking. No Saw cutting
is allowed
