In measuring glass, take the dimensions between rabbets each way when the panes are rectangular; if irregular or circular in form, take the extreme dimensions, and consider the panes rectangular. It costs about 1½ cents per square foot of light to glaze a window. This price includes the cost of putty.
Polished plate glass is used extensively for store-front windows and also for glazing window sash in fine work. There are three qualities: French plate, and two grades of American plate, which may be obtained in various sizes up to 8 feet wide and 14 feet long. The cost of plate glass is estimated by the aid of a price list that gives the cost of the various sizes. This list is furnished by dealers and remains the same from year to year; it is known as the standard list. The fluctuations are provided for by means of a discount, which is the same for all sizes of glass.
TABLE XV
PANES OF WINDOW GLASS PER BOX
| Size Inches | Panes in Box | Size Inches | Panes in Box | Size Inches | Panes in Box | Size Inches | Panes in Box |
|---|---|---|---|---|---|---|---|
| 6 × 8 | 150 | 16 × 22 | 21 | 22 × 28 | 12 | 26 × 58 | 5 |
| 7 × 9 | 115 | 16 × 24 | 15 | 22 × 30 | 11 | 28 × 28 | 9 |
| 8 × 10 | 90 | 16 × 34 | 13 | 22 × 32 | 10 | 28 × 30 | 9 |
| 8 × 12 | 75 | 16 × 38 | 12 | 22 × 34 | 10 | 28 × 42 | 6 |
| 9 × 11 | 73 | 16 × 44 | 10 | 22 × 36 | 9 | 28 × 52 | 5 |
| 9 × 12 | 67 | 18 × 20 | 20 | 22 × 38 | 9 | 30 × 30 | 8 |
| 9 × 13 | 62 | 18 × 22 | 18 | 22 × 48 | 7 | 30 × 40 | 6 |
| 10 × 12 | 60 | 18 × 24 | 17 | 22 × 52 | 6 | 30 × 50 | 5 |
| 10 × 14 | 52 | 18 × 26 | 16 | 24 × 24 | 12 | 30 × 54 | 4 |
| 10 × 16 | 45 | 18 × 32 | 13 | 24 × 26 | 12 | 32 × 32 | 7 |
| 10 × 18 | 40 | 18 × 36 | 11 | 24 × 28 | 11 | 32 × 36 | 6 |
| 12 × 14 | 43 | 18 × 42 | 10 | 24 × 30 | 10 | 32 × 48 | 5 |
| 12 × 16 | 38 | 18 × 52 | 8 | 24 × 32 | 10 | 32 × 52 | 4 |
| 12 × 18 | 34 | 20 × 20 | 18 | 24 × 34 | 9 | 32 × 58 | 4 |
| 12 × 20 | 30 | 20 × 22 | 16 | 24 × 36 | 9 | 32 × 62 | 4 |
| 12 × 22 | 27 | 20 × 24 | 15 | 24 × 38 | 8 | 34 × 34 | 6 |
| 12 × 24 | 25 | 20 × 26 | 14 | 24 × 40 | 8 | 34 × 36 | 6 |
| 14 × 16 | 32 | 20 × 28 | 13 | 24 × 42 | 7 | 34 × 46 | 5 |
| 14 × 18 | 29 | 20 × 30 | 12 | 24 × 44 | 7 | 34 × 50 | 4 |
| 14 × 20 | 26 | 20 × 34 | 11 | 24 × 46 | 7 | 34 × 56 | 4 |
| 14 × 22 | 24 | 20 × 36 | 10 | 24 × 52 | 6 | 36 × 36 | 6 |
| 14 × 24 | 22 | 20 × 38 | 10 | 24 × 60 | 5 | 36 × 44 | 5 |
| 14 × 26 | 20 | 20 × 40 | 9 | 26 × 26 | 11 | 36 × 48 | 4 |
| 14 × 36 | 14 | 20 × 52 | 7 | 26 × 28 | 10 | 36 × 54 | 4 |
| 14 × 40 | 13 | 22 × 22 | 15 | 26 × 32 | 9 | 36 × 58 | 3 |
| 16 × 18 | 25 | 22 × 24 | 14 | 26 × 44 | 6 | 36 × 64 | 3 |
| 16 × 20 | 23 | 22 × 26 | 13 | 26 × 52 | 5 | 40 × 60 | 3 |
When stained or art glass is used, the specifications generally limit the cost, as the glass is made according to the architect’s designs or to approved designs submitted by manufacturers. The price depends more on the amount of lead or copper used than on the cost of the glass itself, and therefore no very close estimate can be made. The following figures are only approximate:
| Cost Per Square Foot | |
|---|---|
| Clear glass | $1 to $3 |
| Opalescent glass | $1 to $3 |
| Plate glass | $2 to $4 |
| Cathedral glass | $3 to $5 |
| Favrille glass | About $8 |
Ordinary window, or sheet, glass is sold by the box, which contains, as nearly as possible, 50 square feet, whatever the size of the glass may be. There are two qualities of ordinary glass, known as single and double thick, the former being about ¹/₁₆ inch thick, and the latter nearly ⅛ inch. Single-thick glass should never be used in panes over 24 in. × 24 in. in size. [Table XV] gives the number of panes of window glass in one box of 50 square feet.