Archives

What is a stair stringer (string)?

A stair stringer, or string, is the inclined board or beam at the side of a stair that carries the treads. Types, parts and tips for squeaky or loose treads.

What is a lattice girder?

A lattice girder is a three-dimensional truss of welded reinforcing steel, best known as the reinforcement in precast lattice girder (filigree) slabs.

What is trachyte?

Trachyte is a light grey volcanic rock with large feldspar crystals. Origin, use in Cologne Cathedral and medieval churches, and restoration advice.

What is chequer plate (tread plate)?

Chequer plate, also called tread plate or diamond plate, is metal sheet with a raised pattern for extra grip. Uses, steel or aluminium, thickness and tips.

What is a total station?

A total station is an electronic surveying instrument that measures angles and distances and calculates coordinates. How it works, uses on site and tips.

What is the Tuscan order?

The Tuscan order is the plainest classical order: smooth shaft, simple base and capital, undecorated frieze. Features, history and how to recognise it.

What is Torx?

Torx is a six-lobed, star-shaped screw drive (hexalobular). Sizes, variants, advantages and practical tips for working with Torx screws.

What is a torus moulding?

A torus is a large, convex, roughly semicircular moulding at the base of a column or on a plinth. Shape, the Attic base and restoration tips.