SimplifyDIY Glossary: J-K
J
Jamb
Vertical side face of a doorway or window.
Joist
A horizontal wooden or metal beam (such as a RSJ) used to support a structure such as a floor, ceiling or wall.
Junction box
An electrical fitting allowing a power or lighting circuit to be extended.
K
Key
To roughen a surface by scoring or sanding to provide a bond for any application of paint, plaster, rendering, tiles etc. Also spaces between laths or wire meshes which provide a grip for plaster.
Knock-down (KD)
Another name for flat-pack furniture or units.
Knock-down (KD) fittings
Fittings and fixings supplied with flat-pack furniture or units by the manufacturers, typically including screws, bolts and cam and stud fixings.
Knotting Fluid
Sealer, made from shellac, that prevents wood resin bleeding through a surface finish.
Knurled
On a knob or handle, a series of fine grooves impressed into an edge or surface to improve the grip when turned or handled.
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