Construction estimating glossary

The volume of finished concrete or mulch produced by one bag, listed on the product label. Common concrete bag yields are 0.30 cu ft (40 lb), 0.375 cu ft (50 lb), 0.45 cu ft (60 lb), and 0.60 cu ft (80 lb). Mulch is typically sold in 2 cu ft bags.

See also: How Many Concrete Bags Do I Need? , Concrete Calculator

The square footage one full box of tile covers, printed on the box and the product listing. Box coverage varies by tile size and packaging. Use the label value when estimating, then round box count up after applying the cut-waste percentage.

See also: Tile Calculator , Tile Waste Factor Guide

A deliberate weakened line tooled or cut into a concrete slab to control where cracking happens as the slab cures and moves. Standard residential practice spaces control joints at 24–36 times the slab thickness in feet (for example, every 8–12 ft for a 4 in slab).

See also: How to Measure for Concrete

A volume of 3 ft × 3 ft × 3 ft, or 27 cubic feet. Ready-mix concrete, bulk mulch, topsoil, gravel, and sand are all sold by the cubic yard. At 0.60 cu ft per 80 lb concrete bag, one cubic yard equals 45 bags after rounding.

See also: Bagged Concrete vs Ready-Mix , Mulch Bags vs Bulk Delivery

Extra tile or sheet material added on top of the measured area to absorb perimeter cuts, damaged pieces, and layout offcuts that cannot be reused. Common defaults are 10% for straight tile layouts, 15% for diagonal, and 15–20% for patterned or large-format tile.

See also: Tile Waste Factor Guide

A spray paint formulated to dry into a powder before it lands, used on exposed ceilings, ductwork, and rafters in commercial spaces. Not typical for residential rooms; if you see "dryfall" specified, it usually means an overhead spray application rather than roller-applied wall paint.

The space between adjacent tiles filled with grout after the tile sets. Joint width affects both grout consumption and the visual pattern. Common widths are 1/16 in for rectified large-format porcelain, 1/8 in for standard wall and floor tile, and 1/4 in or wider for handmade or rustic tile.

A unit equal to one one-thousandth of an inch (0.001 in), used to describe coating thickness for paint, sealers, and membranes. Manufacturer coverage rates assume a target wet-mil thickness — applying thicker coats reduces coverage and may extend cure time.

A measure of an insulation material's resistance to heat flow, where higher numbers indicate better insulation. Building codes specify minimum R-values for walls, ceilings, and floors that vary by climate zone. R-value depends on the material, its installed thickness, and how well it fills the cavity.

Concrete batched at a plant and delivered to the site in a mixer truck. Typically sold by the cubic yard with delivery minimums and short-load fees. Compare ready-mix with bagged concrete when project volume reaches roughly 1 cubic yard or higher.

See also: Bagged Concrete vs Ready-Mix

A horizontal pour of concrete that serves as a floor, patio, walkway, or pad. Residential exterior slabs are commonly 4 inches thick; vehicle slabs and structural slabs are thicker and often include rebar or welded wire mesh. Always estimate slab volume from the finished concrete footprint, not the form lumber's outside edge.

See also: Concrete Calculator , How to Measure for Concrete

On roofing materials, one "square" equals 100 square feet of finished roof area. Shingles are sold in bundles, and most asphalt shingle products need 3 bundles per square. Always compare shingle bundle yield against the product label before ordering.

A cement-based adhesive mortar used to bond tile to a substrate. Coverage depends on trowel size, tile back texture, and substrate flatness. Large-format tile and natural stone may require modified thinset or specific bonding products listed on the tile manufacturer instructions.

A percentage added to the measured material quantity to absorb spillage, uneven excavation, damaged pieces, layout offcuts, and small touch-ups. Defaults vary by material: 10% for clean rectangular concrete forms and mulch beds, 10–15% for drywall, 10–20% for tile depending on layout complexity.

See also: Tile Waste Factor Guide , Methodology