Carpentry for Vocational Schools - A Teacher's handbook (GTZ, 252 p.) 21. SKIRTING, ARCHITRAVES, CORNERSTRIPS (introduction...) 21.1. Shapes 21.2. Cutting and joining

Carpentry for Vocational Schools - A Teacher's handbook (GTZ, 252 p.)

21. SKIRTING, ARCHITRAVES, CORNERSTRIPS

TOPIC: 21. SKIRTING, ARCHITRAVES, CORNERSTRIPS

INTRODUCTION: This topic teaches students different shapes of cornerstrips, architraves and skirtings and how these are cut and joint correctly.

OBJECTIVES:

21.1. Students should be able to define the terms: Architrave, Skirting, Cornerstrip and identify different shapes by their names.

21.2. Students are expected to be able to cut and join cornerstrips, architraves and skirtings exactly at either 90 degrees or 45 degrees and to fit them properly.

METHOD:

21.1. Prepare different types and shapes of cornerstrips, skirtings and architraves and display them in the classroom.

Explain by referring to the cornerstrips architraves and skirtings on doors, windows and corners of the classroom to their purpose.

Write the necessary information on the blackboard and students copy into their trade theory book.

21.2. Prepare a mitre box and pieces of cornerstrips and demonstrate how to mitre cut strips correctly.

Write the procedure for cutting and fitting strips on the board and students copy into their trade theory book.

NOTE: At the end of this topic a worksheet is prepared to reinforce tillings learnt. Students have to complete it as homework. Worksheets are then collected for correction and assessment.

Skirting is the moulded badeboard around a room. It is fixed at the junction of the wall and the floor for protection to the wall cladding which would otherwise be damaged by brooms and chair legs.

Architrave is the cover piece between the wall and the jamb being of an opening.

Cornerstrips are used to cover the joints of the plywood, which occur in the corners.

Figure

21.1. Shapes

Quadrant

Ovolo

Scotia

One side chamfered

Two sides chamfered

21.2. Cutting and joining

a) Architrave: - On doors, the bottom end of the side architraves are cut square first. The top ends are cut mitre with the aid of a mitre box. Mitre means the timber is cut at an angle of 45 degrees. Allow a 3 mm quirk between architrave and jamb. When the architrave fits tight, nail it.

Figure

b) Skirting: - Skirtings are mitre jointed at the corners and butt or mitre jointed along their length.

Figure

c) Cornerstrips: - At corners the cornerstrips are mitre jointed and along their length they can be mitre or butt jointed.