DIY Home Improvement Glossary

Cement-based or fiber-reinforced board installed as a substrate for tile in wet areas like showers, providing a stable, moisture-resistant surface.

A wall that carries structural loads from above (roof, upper floors) down to the foundation.

A woodworking joint using an oval-shaped compressed wood wafer (biscuit) glued into matching slots to align and strengthen a butt joint.

A set of legally enforceable rules governing the design, construction, and modification of buildings to ensure safety and health standards.

A flexible sealant (silicone, latex, or polyurethane) used to fill gaps and joints between surfaces to prevent air and water infiltration.

An automatic switch in the electrical panel that stops current flow when it exceeds a safe level, protecting against fire and equipment damage.

A conical hole cut into material so that a screw head sits flush with or below the surface.

Decorative trim installed at the junction of walls and ceilings, typically requiring compound miter cuts for inside and outside corners.

A panel made of gypsum plaster pressed between thick sheets of paper, used to create interior walls and ceilings.

A space left around the perimeter of floating floors to accommodate natural expansion and contraction of the flooring material.

Waterproof material (metal or membrane) installed at roof joints, windows, and wall intersections to redirect water and prevent leaks.

A thin strip of wood or metal attached to a wall, ceiling, or floor to create a level surface for attaching finish materials.

Ground Fault Circuit Interrupter. An electrical device that quickly disconnects a circuit when it detects current leaking through an unintended path.

A horizontal framing member that supports a floor or ceiling, spanning between walls, beams, or other structural supports.

A power saw that makes accurate crosscuts and miter cuts at various angles, commonly used for cutting trim, molding, and framing lumber.

A measurement from the center of one framing member to the center of the next, used to describe stud, joist, or rafter spacing (e.g., 16 inches OC).

A U-shaped pipe fitting that retains water to form a seal against sewer gases entering through drain openings.

A small guide hole drilled before inserting a screw or nail to reduce splitting risk and ease fastener installation.

Perfectly vertical, as determined by a plumb bob or level. The vertical counterpart of 'level' (horizontal).

A measure of a material's resistance to conductive heat flow. Higher R-values indicate better insulating performance.

The installation phase for concealed systems (framing, plumbing, electrical, HVAC) before finish surfaces are applied.

A tapered wedge of wood or plastic used to fill small gaps, level surfaces, or make precise adjustments during installation.

The structural panel layer (plywood or OSB) nailed to floor joists, serving as the base for finished flooring materials.

A cement-based adhesive mortar used to bond ceramic, porcelain, or stone tile to a substrate.

A hollow-wall fastener with spring-loaded wings that expand behind the wall surface, providing strong anchoring in drywall where no stud is available.