The following shall be the rules for the measurement of mason work in this State:

The units of measurement shall be as follows:

(1) Generally. — For excavation, the cubic yard.

For concrete foundation, the cubic yard.

For concrete floors, the superficial foot.

For dimension stone footings, the superficial foot.

For dimension stone bridge masonry, the cubic foot.

For dimension stone surface dressing, the superficial foot, extra price.

For rubble work, the perch of 24¾ cubic feet.

For rubble work surface dressing, the superficial foot, extra price.

For brick work, the thousand brick.

For plastering plain surfaces, the superficial yard.

For plastering cornices, the running and superficial foot.

(2) Perch of stone. — A perch of stone shall contain, when measured in the wall, 243/4 cubic feet; when measured in square piles on the ground, 27 cubic feet.

When measured in boats, 30 cubic feet.

When measured in cars, 311/2 cubic feet.

All stone to be measured in the wall when practicable.

Any mason work contracted for, in which the contractor agrees to furnish both materials and labor at a stated sum per perch, shall be measured and computed according to the following rules governing the measurement of mason work, i.e., mason measure shall be the basis of settlement;

(3) Excavation. — All excavation to be measured and computed by the actual amount of material displaced. No allowance for rehandling. Walls to be measured by the lineal foot in depth.

(4) Concrete. — Foundation, measure actual contents. Floor, measure actual surface laid, except that no deduction be made for open tile drains.

(5) Dimension stone. — Footings to be measured each course separately. No deductions for drain or other openings under walls 2 feet, or less, in width.

Bridge masonry, compute actual cubic contents.

Surface dressing of all kinds extra.

(6) Rubble work. — Footings to be measured by actual cubic contents.

Footings are all such foundation courses not exceeding 16 inches in height as are wider than the body of wall above.

(7) Walls. — Compute actual contents and for each angle or corner of 90 degrees in a vertical wall, add 2 cubic feet for each foot in height of the wall, if the wall is battered add 21/2 cubic feet for each foot in height.

For each angle of more or less than 90 degrees in any wall, add 2 feet in length of wall.

(8) Partition walls. — Intersections of walls, measure actual contents of the walls and add 1 cubic foot for each foot in height for each angle made by the faces of the intersecting walls.

(9) Circular walls. — For round walls, for length of walls, take 11/4 times the girt measure.

(10) Pilasters and projections. — All projections, such as chimney breasts, piers connected with walls and pilasters, to be measured actual cubic contents and add thereto 1 cubic foot for each intersection of the sides of such projection with the wall, and 2 cubic feet for each outer corner for each foot in height. If such projections are battered on the outer face, add 21/2 cubic feet instead of 2 cubic feet for each outer corner for each foot in height.

(11) Square or polygon piers. — Square or polygon piers, to be measured actual cubic contents; if vertical, 2 cubic feet to be added for each corner for each foot in height. If battered, add instead 21/2 cubic feet for each corner for each foot in height.

(12) Round piers. — Round piers, add 3 feet to the measured diameter of the pier, and compute the contents, with this sum used as the diameter, the height to be taken as measured.

(13) Stepped piers or piers with vertical offsets. — Stepped piers or piers diminishing from the bottom by offsets shall be computed by rule No. 10, and also add the sum of the areas of the level surface of the several steps (excepting the top of the pier) multiply by 1 foot in height.

All parts of independent piers as are 6 inches or more below the surface of the ground are to be computed actual contents, and 1 cubic foot added for each foot in height or depth.

(14) Recesses and slots. — All recesses and slots to be measured solid, and in addition thereto allow 1 cubic foot for each foot in height.

(15) Arches. — Stone arches are classed as cut stone work.

(16) Openings. — Deduct contents of windows, doors and other openings, measuring from top of sill to spring of arch, and add 3 cubic feet for each jamb for each foot in height of opening. No deduction to be made for cut stone trimmings and lintels.

(17) Jambs. — For any jamb, caused by differences in heights in parts of the same wall, or in adjacent walls, except in junctions of partition walls, add 2 cubic feet for each foot in height.

(18) Change in height of walls after having been leveled. — Compute the additional amount of masonry and add thereto 1 foot in height of wall.

(19) Gables. — Gables to be computed 11/2 times the actual contents.

(20) Beam filling. — For beam filling, on level walls, add 1 foot in height of wall; on gable add 1 foot in height of wall by the extreme width of gable at its base.

(21) Minimum height and thickness of wall. — No wall to be computed at less than 18 inches in thickness, nor 1 foot in height.

(22) Brickwork. — Compute the actual number of bricks laid.

When in the wall and practicable, the number of bricks to be estimated by actual count; when not practicable to so count them the following rule to be taken as a basis for estimating the number, viz.:

Every superficial foot of one-half brick (41/2 inches) wall to be estimated as 61/2 bricks; of 1 brick (9 inches) wall at 13 bricks, etc. Increase the number of bricks by 61/2 bricks for every additional 1/2 brick in thickness of wall.

(23) Measurement of party walls. — Party walls to be measured according to the above rules, and joist holes to be charged at the rate of 15 cents each.

(24) Plastering and lathing. — To be measured by the superficial yard from floor to ceiling for walls, and from wall to wall of ceiling.

(25) Corners, beads, etc. — All corners, angles, beads, quinks, rule joints and mouldings to be measured by the lineal foot on their longest extension.

Add 1 foot for each stop or mitre.

(26) Cornices. — Length of cornices to be measured on walls. Plain cornices, of 2 feet girt, or less, to be measured on walls by the lineal foot.

Plain cornices exceeding 2 feet girt to be measured by the superficial foot.

Add 1 lineal foot by girt for each stop or mitre.

Enriched cornices (cast work) by the lineal foot for each enrichment.

(27) Arches, corbels, etc. — Arches, corbels, brackets, rings, centre pieces, pilasters, capitals, vases, resettes, basses, pendants and niches, by the piece.

(28) Openings. — Openings in plastering to be measured between grounds. No deduction to be made for opening of 9 feet or less.

For openings of more than 9 feet square, deduct contents of openings.

19 Del. Laws, c. 697; Code 1915, § ?2931; Code 1935, § ?3435; 6 Del. C. 1953, § ?5321;