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Pier Layout
- 12 piers — 2 rows × 6
- 6' span between rows
- Spacing: 0', 4' 4⅞", 8' 9⅝", 13' 2⅜", 17' 7⅛", 22' 0"
- Depth: 4' (below frost line)
- QUIK-TUBEs fit exactly — no cutting
Floor Height & Structure
- Target height above grade: ~10–11"
- Pier stub 3" + beam 7¼" + decking ¾"
- Doubled beams — splices staggered
- Joists hung flush with beam top
- No center beam needed at 6' span
Material standards: All ground-contact lumber must be UC4B rated PT (not UC3B or lower). All hardware galvanized or stainless — ACQ compatible. Treat all field-cut ends immediately with Cut-N-Treat before assembly.
| Item |
Spec |
Qty |
Unit |
Total |
| QUIK-TUBE 12" × 48" form |
12" dia., 48" length — fits 4' hole exactly, no cutting needed |
12 |
$16.28 |
$195.36 |
| 80 lb. concrete mix |
~4,000 PSI; yields ~0.6 cu ft/bag; 4 bags per pier |
48 bags |
$6.47 |
$310.56 |
| ABA ZMAX adjustable post base (4×4) |
18-gauge ZMAX galvanized; adjustable standoff; ACQ compatible; set anchor bolt in wet concrete |
12 |
$16.30 |
$195.60 |
| 50 lb. all-purpose gravel |
Pier base drainage bed; ~1 bag per pier |
12 bags |
$6.97 |
$83.64 |
| 12" auger rental (4 hrs) |
Power auger for 12"-dia. × 4'-deep holes; 4 hrs sufficient for 12 piers |
1 |
$67.00 |
$67.00 |
Concrete at upper estimate (4 bags/pier) — using 3 bags/pier saves ~$77. | Full-day auger rental available at $96 if needed.
| Item |
Spec |
Qty |
Unit |
Total |
| 2×8×8 PT — long side beams (doubled 2-ply) |
UC4B; actual 1½" × 7¼"; 3 boards/ply × 2 plies × 2 sides = 12 boards. Ply 1 splices at 8' & 16'; Ply 2 splices at 4' & 20' |
12 boards |
$13.48 |
$161.76 |
| 2×8×8 PT — end caps |
UC4B; cut to 6'; single ply sufficient for short span |
2 boards |
$13.48 |
$26.96 |
| 3-1/4" × 0.131" galvanized framing nails (750-ct) |
21° plastic collated, exterior galvanized — safe for PT lumber; Freeman PFR2190 compatible; covers beam lamination (2 rows staggered every 16" OC) + wall framing; shared box — costed in wall/roof list |
— |
— |
see wall list |
No center beam needed — 2×8 joists at 16" OC span 6' without mid-span support. Doubled beams eliminate single-point splice failures and prevent lateral rolling during construction.
| Item |
Spec |
Qty |
Unit |
Total |
| 2×8×12 PT — joists |
#1 Ground Contact PT; 16" OC; cut to 6' — 2 joists per 12' board, zero waste; 16 interior joists |
8 boards |
$21.38 |
$171.04 |
| Galvanized face-mount joist hanger for 2×8 |
LUS28 or equivalent; 18-gauge ZMAX galvanized; 2 per joist (one each end) = 32 total |
32 |
$2.48 |
$79.36 |
| SD connector screw #9 × 1-1/2" (100-pk) |
Strong-Drive; 1/4-hex drive; for joist hanger fastening; ~8 screws/hanger × 32 hangers = 256 screws needed |
3 packs |
$16.65 |
$49.95 |
Joists hung flush with beam top (not stacked on top) to keep floor height at target. ABA ZMAX post bases handle beam-to-pier uplift; LUS28 hangers handle joist-to-beam uplift — no additional hurricane ties needed for floor.
| Item |
Spec |
Qty |
Unit |
Total |
| 3/4" T&G PT plywood 4×8 |
Ground Contact rated; PS 1-09 performance sheathing; tongue-and-groove edges; 132 sq ft needed; 5 sheets = 160 sq ft with waste |
5 sheets |
$56.48 |
$282.40 |
| 10 oz. construction adhesive |
PL Premium or equivalent; applied to joist tops before laying sheets |
3 tubes |
$3.48 |
$10.44 |
| #9 × 3" construction screws — 1 lb. box |
Star drive, dual flat head, coarse thread; ~65/box; 5 boxes ≈ 325 screws; fasten every 6–8" at edges, 12" in field |
5 boxes |
$10.88 |
$54.40 |
| Item |
Spec |
Qty |
Unit |
Total |
| Woven landscape fabric 4×50 ft. |
Heavy PP woven weed barrier; 1 roll = 200 sq ft; covers 6×22' (132 sq ft) with overlap to spare |
1 roll |
$17.79 |
$17.79 |
| Cut-N-Treat wood preservative — 1 qt. |
Apply to all field-cut PT lumber ends immediately after cutting |
1 |
$14.98 |
$14.98 |
| Item |
Spec |
Qty |
Unit |
Total |
| Home Depot delivery |
Standard delivery |
1 |
$79.00 |
$79.00 |
| Concrete Piers | $852.16 |
| Beams | $188.72 |
| Floor Joists | $300.35 |
| Decking | $347.24 |
| Ground Prep | $32.77 |
| Delivery | $79.00 |
| Total | $1,800.24 |