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Post spacing from the Bufftech WindZone table, not a rule of thumb

Everyone says vinyl fence posts go 6 ft apart, because that is the length the sections come in. The manufacturer publishes a maximum that depends on your wind exposure and how deep you dig, and in the worst exposure at a 30 in footing it is 56 in, which a standard 6 ft section does not fit. This checks yours against the table.

Vinyl fence takeoff

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Maximum spacing and footing depths from the Bufftech installation guideline.

Specification summary

Generated from on . Reopen that address to reproduce these figures exactly.

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Result

AllowedYours
Post spacing against the wind table maximum

Vinyl fence prices

Per linear foot
ItemLowHighUnit
Most 4 to 6 ft vinyl fences$15$40per linear ft
Materials$10$30per linear ft
Labor$5$10per linear ft
Privacy style$25$60per linear ft
Three-rail or horse style$15$25per linear ft
Picket style$14$20per linear ft

Source: HomeAdvisor, how much does a vinyl fence cost to install. Last price check: September 13, 2026.

The source says it was updated using automation technology and reviewed by an editor. Its style table does not say whether it includes installation; its materials and labor ranges add up to its 4 to 6 ft range. The same guide gives $2,340 to $5,995 for a job, $4,158 on average.

Worked example

A 100 ft run of 6 ft privacy vinyl in suburban exposure B, standard 6 ft sections, 4x4 posts, footings 30 in deep.

  1. The maximum. Exposure B at a 30 in footing allows 97 in between posts. A 72 in section is comfortably inside it.
  2. Now change exposure to D. At the same 30 in footing the maximum drops to 56 in, and the standard section no longer fits.
  3. The fix is depth, not width. Go to a 36 in footing in exposure D and the maximum rises to 75 in, and 72 in fits again.
  4. Sections. 100 ft at 72 in is 17 sections and 18 posts.
  5. Concrete. 18 posts in a 10 in hole 30 in deep is 24.5 cu ft, or 41 sixty pound bags.

That exposure D case is the one worth knowing. It is not exotic, it is any flat open site near water, and the material list is identical right up to the moment it fails inspection.

The formula

Sections divide the run. The maximum spacing is looked up, not derived:

sections = ⌈ 12L / w ⌉    posts = sections + 1    concrete = n π (d/2)² h
L
total run, ft
w
section width, in, fixed by the routing when you buy
n
post count
d, h
hole diameter and depth, in. Bufftech gives 10 in for a 4x4 and 12 in for a 5x5
maximum w
from the WindZone table, by exposure and footing depth

The concrete term uses the full hole depth, which slightly over-buys because the post occupies part of it and the guide fills to 2 to 4 in below grade. Erring high on bagged concrete is the right direction: a post you cannot finish setting is a worse problem than a spare bag.

Why vinyl has a real answer where wood does not

Vinyl fence is manufactured as a system. The rails are extruded to a length and the posts are routed to receive them, so unlike a wood fence you are not free to set the posts where the run works out. The centers are decided in the factory.

That also means the manufacturer has tested the assembly and published what it will stand up to. The Bufftech guideline carries a WindZone table giving a maximum post spacing for each wind exposure at each footing depth, and the spread is large: 97 in in sheltered exposure B at a 30 in footing, down to 56 in in exposure D at the same depth.

The useful part is that the table is a trade rather than a limit. Deeper footings buy wider spacing. In exposure D, going from 30 in to 36 in takes the maximum from 56 in to 75 in, which is the difference between a standard 6 ft section fitting and not fitting.

None of that appears in the guides telling you vinyl posts go 6 ft apart. They are describing what is in the box, not what the manufacturer says you may do with it.

Vinyl post spacing is a wind table, not a number

Ask how far apart vinyl fence posts go and you will be told 6 ft or 8 ft, because that is the length the sections come in. The manufacturer publishes something quite different: a maximum post spacing that depends on your wind exposure and on how deep you dig.

Maximum post spacing by wind exposure and footing depth
Wind exposureFooting depthMaximum post spacing
Exposure B24 in66 in (5.5 ft)
Exposure B30 in97 in (8.1 ft)
Exposure C30 in68 in (5.7 ft)
Exposure C36 in88 in (7.3 ft)
Exposure D30 in56 in (4.7 ft)
Exposure D36 in75 in (6.2 ft)

Bufftech Molded and Extruded Fence Installation Guideline, CertainTeed, document e-2201cts

Read down the table. In exposure B a 24 in footing buys you 66 in of spacing; go to 30 in and you may span 97 in. Digging deeper is what lets you set posts further apart, and that trade is invisible in every guide that just says “posts go 6 ft apart”.

Exposure D at a 30 in footing caps out at 56 in, which is under 5 ft. A standard 6 ft section will not legally fit there without a deeper footing. That is the case worth catching before the material is delivered.

HVHZ: Miami-Dade and Broward counties, wind exposures as defined in the ASCE 7-10

Bufftech installation guideline, WindZone table

The standard module itself is fixed by the routing, not chosen:

4 x 4 POST CENTERS 3" PICKET = 72" 1-1/2" PICKET = 72-1/2"

Bufftech installation guideline, traditional picket

Which is the real difference between vinyl and wood. A wood fence lets you set posts wherever the run works out. A vinyl fence is a kit: the rails are cut to length and the posts are routed to receive them, so the post centers are decided before you buy.

Dig holes 30" deep or to frost line. Hole size for 4 x 4 posts = approximately 10". Clean holes and check for straight walls. Bell bottom of holes.

Bufftech installation guideline, digging holes

Note the order of that sentence: 30 in or to frost line. Where frost goes deeper, frost wins, and frost depth is a local number this site will not guess at.

Why a vinyl fence cannot be cut to fit and a wood one can

Every other fence on this site absorbs a short last bay by trimming something. Vinyl does not, and understanding why saves an order.

The rail is a structural extrusion with routed ends. It is not a board. The rail end is shaped to lock into a routed hole in the post, and the section is engineered as a unit: a rail, two posts, and the pickets between them acting together. Cut the rail short and you have removed the locking end, so the joint becomes a butt joint held by nothing.

The pickets are captive too. They slot into channels in the rails rather than being fastened to them, which is what lets the whole assembly expand and contract with temperature without buckling. A shortened section puts them at the wrong spacing and the last one usually will not seat.

So a short bay is handled at the post, not at the rail. Either the spacing is adjusted across the whole run so every bay is equally under the maximum, or the manufacturer sells a section kit that is genuinely field-cuttable and says so in the instructions. Check the instructions rather than the offcut.

The wind table is a system rating, not a post rule

The spacing maximum this page reads is published against a wind exposure category, and it is easy to read that as a rule about how strong the post is. It is not.

The whole assembly is rated together. The fence is a solid panel presenting its full area to the wind, and the load it collects goes into the posts and out through the footings. Change the post spacing and you change the area each post collects. Change the height and you change it again, which is why the tables are two-dimensional rather than a single number.

Exposure category is about the ground around you, not the weather. It describes how much the surroundings slow the wind before it reaches the fence: suburban with buildings and trees is a different category from open country, and open water is different again. A fence on the exposed side of a lot can sit in a different category from the same fence on the sheltered side.

And the footing is part of the rating. Depth and diameter appear in the same tables as the spacing, because a post that does not move is doing a job the post alone cannot. Undersize the hole and the published spacing no longer describes your fence.

Which is the argument for reading the manufacturer's table rather than the six-foot rule of thumb. The rule of thumb is the length the sections come in. It was never a wind rating.

Frequently asked questions

How far apart do vinyl fence posts go?
As far as the manufacturer's wind table allows, which is not one number. Bufftech publishes 97 in for wind exposure B at a 30 in footing, 68 in for exposure C at 30 in, and 56 in for exposure D at 30 in. The standard section is 72 in, so in exposure D at that depth it does not fit.
Can I space vinyl fence posts 8 feet apart?
Only where the wind table permits 96 in, and none of the Bufftech figures reach that: the widest listed is 97 in, for exposure B at a 30 in footing. Eight foot sections exist, so check the maximum for your exposure and footing before buying them.
How deep should vinyl fence posts be?
Bufftech says 30 in deep or to the frost line, whichever is deeper. Frost depth is local. Depth also buys spacing: the wind table gives a wider maximum for a deeper footing.
What size hole for a vinyl fence post?
About 10 in for a 4x4 post and 12 in for a 5x5, per the Bufftech guideline, with the bottom belled and the concrete tamped and finished 2 to 4 in below grade.
Why can I not just cut a vinyl section shorter?
You can shorten rails, but the posts are routed at fixed positions to receive them and the pickets are sized to the section. Cutting is normal at the end of a run and at a corner; it is not a way to change the module.
What is wind exposure B, C and D?
Categories from ASCE 7. Broadly, B is suburban or wooded, C is open terrain with scattered obstructions, and D is flat unobstructed ground, often near open water. Your building department will tell you which applies.
What is HVHZ?
The High Velocity Hurricane Zone, which the Bufftech table defines as Miami-Dade and Broward counties with wind exposures per ASCE 7-10. Those have their own requirements including aluminum post inserts.
Is a PVC fence the same as a vinyl fence?
Yes. Vinyl fencing is made from PVC, and HomeAdvisor's guide covers both under one title. It gives $15 to $40 per linear foot for most 4 to 6 ft fences and $25 to $60 for the privacy style, with materials at $10 to $30 and labor at $5 to $10.
What does a white vinyl fence cost to install?
HomeAdvisor's rows are by height and style, with no separate row for color, so a white vinyl or white PVC fence is priced on the same lines: $15 to $40 per linear foot for most 4 to 6 ft fences, of which materials are $10 to $30 and labor $5 to $10. On the 100 ft worked example that is $1,500 to $4,000, or $2,500 to $6,000 in the privacy style.
How much does a white vinyl fence cost to install?
HomeAdvisor's June 2026 guide gives $15 to $40 per linear foot for most 4 to 6 ft vinyl fences, $25 to $60 for privacy style and $14 to $20 for picket. The guide does not price white separately from other colors.
How much do vinyl fence panels cost?
HomeAdvisor's June 2026 guide gives $10 to $30 per linear foot for vinyl fence materials, and $15 to $40 installed.

Check these numbers yourself

How every figure here is verified: Sources & Method. Who builds this: , and the method is on About. Found something wrong? Tell us and it gets fixed or removed.

Figures on this page last checked against the source documents on 2026-09-13. Codes are amended locally; confirm against the edition your jurisdiction enforces.

Related calculators

One manufacturer's table. The wind figures here are Bufftech's and other brands publish their own. Footing depth is 30 in or the frost line, whichever is deeper, and frost depth is local. High Velocity Hurricane Zone installations have additional requirements this page does not cover.