Fixed drywall T squares are comprised of two rulers held together in a fixed position by rivets, with the smaller rule behind so that it can rest on the edge of a board.

They are positioned at right angles to each other and allow for easy straight cuts to be made on a plasterboard sheet.

Adjustable squares

Adjustable drywall T squares may be used instead of, or as well as, fixed squares. Their top ruler can be turned 360 degrees.

This allows the user to mark and cut the plasterboard at any angle and can be useful if cutting to sloping ceilings or arched doorways. However, this drywall T square can be more expensive, so the fixed square is sufficient if you rarely need to cut to an angle.

Having both types gives the user the option of adjustable angles, whilst always having a fixed square to hand.

As well as the usual linear scales in either metric, imperial or both units, adjustable squares may have an additional scale showing angular markings. Most adjustable T squares have 4 fixed positions which can vary from model to model, but usually include 45 and 90 degree angles.

Despite these fixed positions, the square allows for a cut at any angle when the central screw is turned.

What does a drywall T square weigh?

Fixed drywall T squares weigh between 0.7kg (1.5 lbs) and 1.1kg (2.5 lbs) depending on the model.

Adjustable drywall T squares weigh a bit more due to their adjusting screw, so usually between 1.3 – 1.5kg (3 – 3.5lbs).

Both types of square, however, are fairly lightweight for ease of use.