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Who We Are and What We DoLegalett’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

Engineered Solutions for Everyday Construction as well as…. 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.


Design AdvantagesLegalett’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 treesPrevention 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


How We Do ItThe 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.


The Engineering Review Process1)

Deformation

Line Loads

Moments

Wire Frame Moments

Soil Bearing Pressure


Pipe Layout

The Engineering Review ProcessUnheated/Heated Space Requirements(note the extended skirting at this location)

Design SpecificsAFI 1000Latitude 45.1 Longitude 75.23100 Year WinterNo Snow or Vegetation Cover


Typical cross section of a standard GEO-Slab

GEO-Slab

Typical cross section of a standard basement GEO Slab

GEO-Basement Slab

GEO-Passive Slab Salus

Reinforcing design includes point loading built into the slab in many areas.

1st rows of snake chairs and bottom mesh installed


High water tables and soil loading designed for less then 65 kPa


1- a base of ¾” clear stone is put down2- 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 lines5-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 elements6-Reinforcing steel is installed

1 2 3

4 5 6


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



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



-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



Many Embedments


Legalett site support was ongoing throughout the project and a full inspection of the work performed was undertaken prior to

placement of concrete


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

Thank you for your interest in GEO-Slab

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