3. The foundation walls are built of rubble masonry to the sill at the grade line, and from this sill to the water-table they are built of ashlar with rubble backing, except those portions behind porches and steps, which are wholly rubble. The estimate for stonework also includes the concrete for footings and cellar floor; the number of cubic feet of concrete required for the footings will be found by referring to the item Excavation for Wall Footings.
Rubble Masonry
| Cubic Feet | ||
|---|---|---|
| Quantities[6] | ||
| Cellar walls, 181' 2" × 1' 6" × 6' 6" | 1,766.4 | |
| Add for extra thickness over 1' 6": | ||
| 5" × 6' 3" × 6' 6" | 16.9 | |
| 1' 2" × 10' 8" × 6' 6" | 80.9 | 97.8 |
| [7]Foundation walls for front porch: | ||
| 74' 6" × 1' 8" × 1' 9" | 217.3 | |
| 74' 6" × 1' 2" × 9" | 65.2 | 282.5 |
| Foundation for steps: | ||
| 2 piers, 1' 6" × 1' 8" × 2' 6" | 12.5 | |
| 2 piers, 2' x 1' 6" × 2' 6" | 15.0 | 27.5 |
| Stone footings under porch foundations, | ||
| 74' 6" × 2' 3" × 6" | 83.8 | |
| Backing for ashlar and water-table, | ||
| 79' 10" × 1' (average) × 3' | 239.5 | |
| Rubble wall behind porches, | ||
| 101' 4" × 1' 6" × 3' (approximately) | 456.0 | |
| [8]Foundation walls, rear porch, | ||
| 26' 10" × 1' 6" × 2' 6" | 100.6 | |
| Footings, walls rear porch, 26' 10" × 2' 4" × 6" | 31.3 | |
| Area walls, 13' 9" × 1' × 6' 6" | 89.4 | |
| Stone footing for area walls, 13' 9" × 1' 9" × 6" | 12.0 | |
| Piers, 1' 6" × 1' 6" × 2' 6" × 2 | 11.3 | |
| Pier footings, 2' × 2' × 6" × 4 | 8.0 | |
| Pier footings, 2' × 1' 9" × 6" × 2 | 3.5 | |
| Total rubble masonry | 3,209.2 |
Cost
The cost of the rubble masonry based on the analysis given in Estimating and Calculating Quantities, Part 1, using 1-3 Portland cement mortar, is $5.23 per perch.
Summary
From the foregoing calculation, the quantity of rubble masonry is 3,209.2 cu. ft. Taking 25 cu. ft. to 1 perch, 3,209.2 ÷ 25 = 128.4 perches, which at $5.23 per perch makes the total cost of rubble masonry $671.53.
Ashlar[9]
| Square Feet | |
|---|---|
| Quantities | |
| Facing for cellar walls, 79' 10" × 2' 2" | 173.0 |
| Porch piers, 29' 6" × 1' 6" | 43.9 |
| Total ashlar | 216.9 |
Cost