This section is from the book "The Building Trades Pocketbook", by International Correspondence Schools. Also available from Amazon: Building Trades Pocketbook: a Handy Manual of reference on Building Construction.
Plastering on plain surfaces, such as walls and ceilings, is always measured by the square yard; but there are consid-erable variations in detail in the methods of measurement in different sections of the country. The following rules, however, probably represent the average practice, and are equitable to both parties concerned:
On Avails and ceilings, measure the surface actually plastered, making no deduction for grounds or for openings of less extent than 7 superficial yards.
In closets, add one-half to the actual measurement; if shelves are put up before plastering, charge double measurement.
For raking ceilings or soffits of stairs, add one-half to measurement; for circular or elliptical work, charge two prices; for surfaces of domes or groined ceilings, charge three prices.
Round corners and arrises (other than chimney breasts) should be measured by the lineal foot.
On interior work, increase the price 5 per cent, for each 12 ft. above the ground after the first. For outside work, add 1 per cent, for each foot above the lower 20 ft.
All repairing and patching should be done at agreed prices.
Cornices composed of plain members and panel work are measured by the square foot. Enriched cornices, with carved moldings, are measured by the lineal foot. When moldings are less than 12 in. in girth, measurement is taken by the lineal foot; when over 12 in., superficial measurement is used. For internal angles or miters, add 1 ft. to length of cornice; and for external angles, add 2 ft. to length. Sections of cornices less than 12 in. measure as 12 in. Add one-half for raking cornices.
For cornices or moldings abutted against wall or plain surface, add 1 ft. to length of cornice; if against soffit of stairs or other inclined or coved surface, add 2 ft. to length of cornice. Octagonal, hexagonal, and similar cornices, less than 10 ft. in single stretches, measure one and one-half times the length.
For circular or elliptical work, charge double prices; for domes and groins, charge three prices.
Column and pilaster capitals, frieze enrichments, and work of this character, which require artistic treatment, are either made to conform to the models furnished by the architect, or they are modeled from the architect's designs and submitted to him for approval. Expense of modeling is large; prices are usually obtained from specialists in this department.