Planning Fence Posts Around Corners, Slopes, and Gate Openings in a Modular System
Plan the nodes first, then fill the lines. Corners, slope breaks, and gate openings are fixed points whose post positions are dictated by geometry, ground, and gate width, not by your preferred spacing. Set those positions on the plan first, then divide each straight run between nodes into equal spacings that fit your system's panel logic. Working the other way, spacing first, is how layouts end up with an awkward short panel jammed against a gate post. This article covers the three node types and how each one anchors the posts around it.
At a glance
Node type | What fixes its position | What to verify before marking | What it does to neighboring spacing |
|---|---|---|---|
Corner | The intersection of two run lines from property geometry | The angle, and that both runs measure from this shared point | Starts a fresh equal-spacing calculation on each side |
Slope break | The point where the grade changes | The break's true location with a string line and level | Splits the run so flat and sloped sections are spaced separately |
Gate opening | Gate leaf width plus the manufacturer's clearances | The gate model's documented frame dimensions and clearances | Removes the opening from the run before spacing is divided |
Why do nodes get planned before line posts?
A node's position is a constraint. A corner post has to sit where two property lines meet. A slope-break post has to sit where the ground changes. Gate posts have to sit exactly one opening apart, and the opening is a number the gate manufacturer already decided. Line posts are the opposite, they're the adjustable remainder, free to sit anywhere that divides a run evenly.
So the planning order writes itself. Fix what can't move, then distribute what can.
Modular systems make the second half of that cleaner than field-built fencing does, because panel widths are known quantities printed in a catalog rather than dimensions you improvise with a saw. When the panels are standardized, dividing a run becomes arithmetic, and arithmetic is checkable before anything gets ordered.
How do you place corner posts?
A corner post carries panels in two directions at once, so its position is the intersection of two run lines, and you find it by geometry rather than by measuring along the fence.
Stake both property lines or planned fence lines with string, and the corner post mark is where the strings cross. Check the angle at the crossing. Ninety degrees is common but not guaranteed, and a corner that's actually 95 degrees needs to be known now, on paper, not discovered when two panels won't meet.
One post serves the corner, shared by both runs, and each run then measures its spacing outward from that shared point. In a matched system the corner is a cataloged condition rather than a field problem. Modern Yard's component range includes connection components engineered for directional transitions, so a corner resolves to specific parts on the products catalog instead of to improvised bracketry, and the published dimensions let you place the post knowing exactly what will attach to it.
Where do posts go when the ground changes slope?
A slope break is a node because a post needs to sit at or near the grade change for panels to meet the ground consistently on both sides of it. Put the post too far from the break and one panel floats high on its downhill end or buries its uphill end.
Find the break honestly before trusting your eye. Run a string line level across the suspect area and measure down to grade at intervals. Where the measurements start changing steadily, that's your break, and it's often a few feet from where the ground appears to change when you're standing on it.
Then treat what the break creates as separate runs. A flat section and a sloped section spaced as one continuous run forces a compromise spacing that fits neither. Space the flat run between its nodes, space the sloped run between its nodes, and let the break post belong to both. How the panels themselves handle the slope, stepping or racking, rail heights, and panel cuts, is its own subject with its own decisions, and it doesn't change where the posts go. Post position follows the ground. Modern Yard's systems include components engineered for uneven ground and stair-step applications, so the sloped run resolves to cataloged parts the same way the corner did.
Good to know. A long, continuous, even slope isn't a node. It's just a run that happens to be tilted, and it gets one equal spacing of its own. Nodes are where conditions change, not where the ground is interesting.
How do you set the two posts at a gate opening?
The gate opening is a specified dimension, not a leftover gap, which means the gate model gets chosen before these two posts are marked. Work backward from the gate's documentation. The rough opening equals the gate leaf width plus the hinge-side and latch-side clearances stated in the manufacturer's installation manual, and those clearances are the manufacturer's numbers, not yours to estimate.
Fixed-size gate frames make this concrete. A Modern Yard welded aluminum frame like the 71 inch by 42 inch door frame has published dimensions, and its installation manual on the installation guides page states the clearances the frame needs. Read the leaf width, add the documented clearances, and that sum is your post-to-post opening, marked to the fraction of an inch.
Two more decisions belong at this node while you're standing there. Swing direction, because the gate needs clear space to open through its full arc, and which post takes the hinges, because the hinge post carries the gate's weight for the life of the fence and should be planned as a gate-duty post rather than an ordinary line post.
How do the nodes change the spacing between them?
With every node fixed, each straight run between two nodes becomes a simple division problem. Measure the node-to-node distance. Subtract nothing, the gate openings were already isolated as their own nodes. Divide by your system's maximum panel span, round up to get the section count, then divide the run by that count for the actual equal spacing.
The modular advantage shows up in the rounding step. Because panel widths are standardized, the arithmetic tells you immediately whether a run divides cleanly or leaves an adjustment panel, and an adjustment panel you know about on paper can be planned into a mid-run position where nobody will notice it. The same panel discovered on installation day lands wherever the crew happens to be standing, which is usually right beside the gate.
Run the division for every node-to-node segment separately. Equal spacing within a run is what looks right, and it doesn't need to match the spacing of the run around the corner.
What does a finished node-first layout look like on site?
Stake and label the nodes first, corners, slope breaks, and both gate posts, with the gate opening measured between its stakes to the manual's number. Pull string lines between the node stakes so every run has a straight reference. Then measure inward from each node and mark the line post positions from the division you calculated, never by stepping off panel widths cumulatively, because cumulative measuring stacks small errors into a big one at the far end.
Those stakes, plus a written post schedule listing each post's type and position, become documents a dealer or installer can quote from directly. Before ordering, check the component dimensions you assumed against the manufacturer's published engineering drawings, which Modern Yard keeps on its technical drawings page, so the plan and the parts agree before money moves.
Stake the nodes and let the lines follow
Fix the corners where the geometry says, put posts where the ground actually breaks, and set the gate posts to the manual's opening before anything else is measured. Then divide each run between nodes into equal spacing and mark the line posts from the nodes inward. A layout built in that order has no surprises left in it, and the panel that would have been jammed against the gate post never gets ordered.
FAQ
Do corner fence posts need to be planned differently from line posts?
Yes. A corner post's position is fixed by the intersection of two fence lines, and it carries load from two directions. Set it first, verify the actual angle, and start each run's spacing calculation from it.
How do I space fence posts on a slope?
Locate the slope break with a string line and level, place a post at the break, and space the flat and sloped sections as separate runs. A continuous even slope is spaced like any other run, just measured along the ground it actually covers.
How wide should the opening between gate posts be?
Exactly the gate leaf width plus the clearances in that gate's installation manual. The number comes from the manufacturer's documentation, not from a rule of thumb, so choose the gate model before marking the posts.
Should I set gate posts before or after line posts?
Before. Gate posts are nodes with a fixed dimension between them, and line post spacing is calculated in the runs that remain. Setting line posts first is how openings end up an inch wrong.
Can one post serve as both a corner post and a gate post?
Physically it can happen where a gate sits at a corner, and then that post carries both jobs and should be planned to the more demanding spec of the two. On the plan, label it as both so the post schedule and the material order reflect what it really does.
What happens if my run length doesn't divide evenly into panels?
You get an adjustment panel, which is normal. Because you know about it at the planning stage, place it mid-run where it reads as rhythm rather than beside a gate or corner where it reads as a mistake.