How Much Material for a 6x8 Fence Gate?
How much material for a 6×8 fence gate? About 14 dog-ear pickets, 8 pcs of 8-ft 2×4, 4 T-hinges, a latch set, 2 posts and 4 bags of 80-lb concrete.
What a 6×8 double gate really is
Start with the assumptions so the list holds together: the opening is 6 ft wide by 8 ft high, closed by a double gate of two leaves, each about 3 ft wide and 8 ft tall. The skin is 5.5-in × 8-ft dog-ear pickets, run vertically and mounted flush — no gaps — so an 8-ft picket covers the full height with no length cutting. One leaf hangs from a 4×4 post at each side; the two meet on a center latch.
Buy in four groups: the picket skin, the 2×4 frame and braces, the hardware, and the posts with concrete. Count all four first — an extra trip wastes more time than a spare costs.
Full material list for a 6×8 double gate
The whole project, using the assumptions above:
| Item | Quantity | Notes |
|---|---|---|
| Dog-ear pickets, 5.5 in × 8 ft | 14 (buy 15–16) | Seven per 3-ft leaf, flush; edge boards trim to fit the 36-in leaf |
| 2×4 × 8 ft (stiles and rails) | 6 | Four full-height stiles; rails for both leaves cut from two more boards |
| 2×4 × 8 ft (diagonal braces) | 2 | One per leaf, cut to about 7 ft 8 in at 45°; stops sag |
| T-hinges, heavy duty | 4 | Two per leaf on the post-side stile; galvanized or stainless |
| Double-gate latch set | 1 | Center latch so the leaves close without a center post |
| Gate handle | 1 | Pair with the latch; some center latches include a handle |
| 4×4 treated posts | 2 | One hinge post per side; buy 10–12-ft lengths for an 8-ft-tall leaf |
| 80-lb bags of concrete | 4 | About 2 per post in a 10-in × 30-in hole |
Why 14 pickets: the math
Each leaf is 36 in wide, and a flush 5.5-in picket covers 5.5 in of that width: 36 ÷ 5.5 = 6.5 boards. Six boards span only 33 in and leave a 3-in gap, so each leaf rounds up to 7 boards, and the extra 2.5 in comes off the edge boards. Two leaves: 7 × 2 = 14 boards.
Counted as one continuous run, the opening is 72 ÷ 5.5 ≈ 13 boards — but no board can cross the center seam, because each leaf is framed and skinned on its own. That is why the honest net is 14. Add 5–10% for rips and defects and buy 15–16. The fence pickets guide walks through the same counting for a fence run.
Framing and the diagonal brace
Each leaf gets two full-height 2×4 stiles at the outer edges plus top and bottom rails between them — a swinging leaf needs solid wood at the edge for the hinge screws. The rails run about 29 in, so one 8-ft 2×4 cuts both rails for a leaf.
Every leaf also gets one diagonal brace, run from the top of the hinge side down to the bottom rail on the latch side and cut with 45° ends. The brace stops the leaf drooping into a parallelogram — fit it before the pickets go on and the skin locks it in place.
Posts and concrete: the part that carries everything
A double gate needs two 4×4 hinge posts, one on each side of the opening — no center post (see the FAQ). Posts must reach the top of the 8-ft leaf once a third of their length is buried, so buy 10–12-ft lengths, not 8-ft.
Gate posts take a bigger pour than fence-line posts because a swinging gate torques the post every time it opens. Dig each hole at least 10 in wide × 30 in deep, below the frost line: the hole holds about 1.36 cf, the embedded 4×4 takes up about 0.21 cf, and the ≈1.15 cf of fill is close to two 80-lb bags (0.60 cf each) per post — four bags total. The fence post concrete guide covers the lighter 0.8-bag rule for line posts and the 10-post guide shows how much deeper holes add.
Three tips that keep a gate square for years
- Brace every leaf before you skin it. Run the diagonal from the top of the hinge side to the bottom of the latch side, then screw the pickets on so the skin locks the brace and the leaf stays square.
- Buy hinges that won't rust. Galvanized or stainless T-hinges, through-bolted — heavy wet pickets pull plain screws out of a 2×4 in a few seasons.
- Set the posts in concrete, not dry backfill. A hole at least 10 in wide below the frost line, about two 80-lb bags per post, resists the swing's torque and stops frost heave.
FAQ
How many pickets do I need for a 6×8 fence gate?
Fourteen 8-ft pickets — seven per 3-ft leaf — with flush 5.5-in dog-ear pickets: 36 ÷ 5.5 = 6.5, so six boards leave a 3-in gap and you round up to seven per leaf, trimming the edges to fit. Buy 15–16 for rips and defects.
How many 4×4 gate posts do I need for a double gate?
Two — one 4×4 hinge post on each side of the 6-ft opening. Each 3-ft leaf swings on T-hinges bolted to its own post, and the free edges meet on the center latch, so a center post would only narrow the opening. Add a third only if you split the pair into two single gates.
How much concrete does each gate post need?
About two 80-lb bags per post. A 10-in × 30-in hole holds about 1.36 cf; the embedded 4×4 displaces about 0.21 cf, leaving ≈1.15 cf to fill, and an 80-lb bag yields 0.60 cf — 1.15 ÷ 0.60 ≈ 1.9. Budget four bags total, plus one more per post below deeper frost lines.
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