Foundation Calculator

Estimate materials for slab, stem wall, or basement foundations including concrete, rebar, blocks, mortar, and vapor barrier.

Length (ft)

Width (ft)

Thickness

'What is a vapor barrier and do I need one?', 'answer' => 'A vapor barrier (typically 6-mil poly sheeting) is installed under slabs to prevent ground moisture from migrating up through the concrete. It is required by most building codes and essential for slab-on-grade construction.'], ['question' => 'How many CMU blocks per square foot of stem wall?', 'answer' => 'Standard 8"×8"×16" CMU blocks cover approximately 0.89 square feet of wall face area. You need about 1.125 blocks per square foot of wall area. Mortar joints add approximately 3/8" to block dimensions.'], ]" />

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Foundation Type Comparison

Slab-on-Grade

Cost: $ | Fast | No crawl space | Good for warm climates

Stem Wall / Crawl Space

Cost: $$ | Moderate | Access to utilities | Moderate climates

Full Basement

Cost: $$$ | Adds livable space | Best for cold climates