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Dictionary

The measure of the volume or 'flow' of electrical current through a circuit. Circuit breakers are rated in amps (e.g., 15A or 20A) to prevent overheating.

A specialized unit of measure for the volume of lumber. One board foot is equivalent to a volume of 12 inches by 12 inches by 1 inch.

The process of pressing soil or gravel down to remove air pockets. Proper compaction prevents settling and cracking of the finished surface.

A unit of volume equal to a cube that is 3 feet long, 3 feet wide, and 3 feet deep (27 cubic feet). Bulk materials like mulch, gravel, and concrete are often sold by the cubic yard.

The weight of a material compared to its volume. For example, dry sand is less dense (lighter) than wet gravel. DIY calculators often assume 100-110 lb per cubic foot for standard base materials.

A cement-based material used to fill the spaces between tiles. It provides structural integrity and prevents debris from getting under the tiles.

A gypsum-based paste (commonly called 'mud') used to finish drywall joints, corners, and fastener heads. It is usually applied in multiple layers that are sanded smooth after drying.

Lumber that has been dried in a temperature-controlled oven to a specific moisture content (usually 19% or less). This makes the wood lighter, more stable, and less likely to warp.

A measurement of perfectly horizontal alignment. Most horizontal surfaces in a home, like floors and countertops, are intended to be level.

Forcing the calculator to use a specific number of steps regardless of the ideal riser height. Recommended only for experienced builders fitting stairs into a fixed floor layout.

The difference between the named size of lumber and its true dimensions. For example, a '2x4' actually measures 1.5 inches by 3.5 inches due to surfacing at the mill.

The distance from the center of one structural member (like a stud or joist) to the center of the next. Standard spacing is usually 16 inches or 24 inches.

The maximum weight a vehicle (like a truck or van) can carry in its cabin and bed. Exceeding this limit is dangerous and can damage the vehicle's suspension and brakes.

The incline of a roof, expressed as the inches of vertical rise per 12 inches of horizontal run (e.g., a 4/12 pitch).

A measurement of perfectly vertical alignment. A wall is plumb if it is at a 90-degree angle to a perfectly level floor.

Lumber that has been infused with chemical preservatives to protect it from rot and insects. PT lumber is often much heavier than standard lumber because it is sold while still 'wet' from the treatment process.

The vertical distance from the top of one stair tread to the top of the next. Total rise is the height of the entire staircase from floor to floor.

When two lines or surfaces meet at a perfect 90-degree angle. In layout, the 3-4-5 rule is often used to ensure a corner is square.

The structural member that supports the treads and risers on a staircase. It is usually a wide board cut in a zigzag pattern.

The native soil or prepared material at the bottom of an excavation. It must be compacted properly to support the weight of a slab or structure.

A cement-based adhesive used to attach tile to a substrate. It is usually applied with a notched trowel to create ridges for better adhesion.

The horizontal part of a step that you walk on. The depth of the tread is measured from the front edge of one step to the riser of the next.

A thin layer of material (like foam, cork, or cement board) placed between the subfloor and the finished flooring to provide moisture protection or sound dampening.

The electrical pressure or potential difference in a circuit. Standard residential voltage in the US is typically 120V for outlets and 240V for large appliances.

The vertical distance from the finished floor to the ceiling. Standard residential ceiling heights are typically 8 or 9 feet.

The individual lengths of each wall in a room. Used for non-rectangular rooms (L-shaped or complex layouts) to calculate total perimeter and wall area.

The additional amount of material ordered to account for cuts, breakages, and layout errors. Standard waste is typically 10-15%.

The rate of power consumption or production. Calculated as Volts multiplied by Amps (Watts = Volts x Amps).