What is a pinned support?

A pinned support resists vertical and horizontal forces but allows rotation, so it carries no bending moment. Explanation with a comparison of support types.

What is a shelf?

A shelf is a flat board fixed to a wall or inside a cabinet to hold items. Learn how to hang a shelf that stays straight and strong.

What is a gabion?

A gabion is a steel wire mesh cage filled with stone, used as a garden wall, boundary, retaining wall or noise barrier. Learn what to watch out for when building one.

What is a guard stone?

A guard stone (jostle stone) is an angled stone post at the corner of a building or gateway that protects the masonry from damage by passing vehicles.

What is a schampgoot (board gutter)?

A schampgoot is a Dutch type of roof gutter formed by a hardwood board set upright on the roof boarding, usually lined with copper or lead. Mainly used in restoration work.

What is a vaulting shaft?

A vaulting shaft (wall shaft) is a slender half or three-quarter column set against a pier or wall, often carrying a vault rib in Gothic churches.

What is shale?

Shale is a fine-grained, layered sedimentary rock made of compacted clay and silt. Learn how it forms and how it differs from slate.