Estimating Slab Foundations

Use the BidMagic construction estimating software to estimate concrete and masonry foundation costs.

Slab on Grade--Grade Beams

This foundation supports the walls with a grade beam or shallow footing which is poured separately. The slab can be supported by the beam, or it can butt up to it.

On the Foundation Dimensions card, enter the grade beam measurements into Footings & Grade Beams, and the slab measurements into Floor Slabs.

In Specifications, choose a formed grade beam under Concrete Walls on the Concrete card, and a slab under Concrete Slabs. You may also need to include drainage, gravel, vapor barrier or foam insulation beneath the slab, and perimeter insulation.

Slab on Grade--Stem Wall

This foundation is similar to the Slab & Grade Beam, only it has both a footing and a stem wall supporting the slab.

On the Foundation Dimensions card, enter the footing into Footings & Grade Beams, the stem wall into Basement & Stem Walls, and the slab into Floor Slabs.

In Specifications, choose a footing under Concrete Walls on the Concrete card, a stem wall under Concrete Walls or under Masonry Walls on the Masonry card, and a slab under Concrete Slabs on the Concrete card. You may also need to include drainage, gravel, vapor barrier or foam insulation beneath the slab, and perimeter insulation.