Gravel boards in timber and concrete
A gravel board sits at the base of a fence, between the ground and the lowest board or panel, taking the ground contact and splash-back so the panels above it don't have to.
A timber gravel board is cheaper and easier to cut to length but is the component most likely to need replacing within a few years, since it sits closest to damp ground; a concrete gravel board costs more up front but essentially removes that recurring repair.
Either type should sit slightly proud of finished ground level with a stone bed beneath it, rather than being buried, so water can drain away instead of sitting against the timber or panel edge.
Garden orientation and post-rain drying time
A south or west-facing garden dries out after rain considerably faster than a north or east-facing one, purely because it receives more direct sun through the day, which has a real effect on how long timber sits wet and therefore how fast rot and mould can establish.
This is worth factoring into treatment choice as much as species choice — a slower-drying orientation benefits more from a breathable stain that lets residual moisture escape than from a heavier film-forming coating that traps it in.
Two identical fences in the same postcode but opposite orientations can have meaningfully different realistic maintenance intervals for this reason alone.
Water company build-over positions
Public sewers can run beneath private gardens, and water companies generally require notice, and sometimes formal approval, before any structure — including some fence post foundations — is built close to or over them.
The exact rules and required clearance distances vary by water company, but ignoring a known public sewer line when positioning posts risks a dispute or requirement to remove work later.
A free sewer map is normally available from the relevant water company, which is worth requesting before finalising post positions on any plot with an older or shared drainage system.
Stainless fixings in exposed positions
Stainless steel fixings resist corrosion better than galvanised equivalents and don't leave the dark rust streaks that a failing galvanised screw head can bleed into pale or oiled timber.
They're specified more selectively than as a blanket upgrade, typically on coastal or otherwise highly exposed sites, on hardwood where tannins react badly with ordinary galvanised steel, or on visible ironmongery where staining would be obvious.
Grade matters even within stainless — 304 is adequate for most exposed domestic fencing work, while a genuinely coastal or salt-exposed site is better served by the more corrosion-resistant 316 grade.
Seasonal ground heave
Ground heave is the upward or lateral movement of soil as it absorbs water and expands, most pronounced in clay-rich ground after a wet autumn following a dry summer.
A post that was plumb in August can be measurably out of true by the following spring purely from this cycle, without any external damage to the fence.
Where heave is a known issue on a plot, deeper posts and a looser granular surround give the soil room to move without directly loading the post, rather than locking post and ground rigidly together.
Distinguishing frame twist from in-plane rack
A racked frame has gone out of square within its own plane, like a rectangle leaning into a parallelogram, while a twisted frame has warped out of flat so that one corner sits proud of the plane the other three corners define — the two look similar from a distance but need different corrections.
Sighting along the top rail from the hinge side is a quick way to spot twist that a simple diagonal measurement for racking won't reveal.
Galvanised versus stainless fixings
Hot-dip galvanised fixings are the standard for most timber fence repairs and resist corrosion well in normal ground and weather conditions at a lower cost than stainless.
Stainless fixings are worth specifying near the coast or where treated timber with a high copper content accelerates corrosion of standard galvanised fittings, since that combination corrodes noticeably faster than inland, untreated timber.
Resin anchor fixings for a bolted baseplate post
A resin anchor sets a threaded stud into a drilled hole in existing concrete or masonry using a two-part chemical resin, giving a strong fixing for a bolted baseplate post where excavating a new footing isn't practical, such as on an existing hardstanding.
Anchor depth and resin cure time both need to match the manufacturer's data for the load expected, and a resin anchor installed into damp or dusty concrete without proper hole cleaning will pull out well below its rated capacity.
Drainage as a repeat cause of failure
Where a post has failed at the base, poor drainage around that specific spot is often the underlying reason rather than simple age — a low point that collects rainwater rots a post from the ground up years before the timber above shows any sign of it.
A repair that resets the post without addressing the drainage at that point risks the same failure recurring within a few seasons.
Drilling into engineering brick or dense blockwork
Engineering brick and dense concrete block are far harder than ordinary facing brick, so standard masonry drill bits blunt quickly and a hammer-action drill with a carbide-tipped bit designed for dense material is needed to make progress without excessive heat.
Drilling slowly with intermittent withdrawal to clear dust keeps the bit cooler and the hole cleaner than forcing continuous pressure, which tends to glaze the hole and reduce the fixing's grip.
Where a wall is engineering brick specifically because it's load-bearing or below damp-proof course, it's worth checking that the fixing depth and pattern doesn't compromise the wall's structural role before drilling a run of holes into it.
Surface preparation before re-coating
Re-coating over an existing failed or flaking finish without preparation traps whatever is underneath — old paint fragments, algae, or degraded stain — and the new coat fails at the same points within a season.
A light sand or wire-brush pass to remove loose material, followed by a full dry-out period, gives a fresh coat something sound to key into rather than a film sitting over compromised timber.
Timing matters as much as preparation: coating damp timber traps moisture under the new film and is one of the most common reasons a re-coat fails faster than the original application.
Checking an unstable adjacent structure before repairing the fence against it
Where a fence panel is fixed to or sits hard against a garden wall, shed or outbuilding that's itself showing signs of movement, repairing the fence without addressing the structure it depends on risks the same failure recurring.
This is worth flagging to a client as a separate issue rather than working around it silently, since a fence repair fixed to an unstable wall is only as reliable as that wall.
Repair-versus-replace where the original installation was poor
A fence that's failed early because of shallow footings, undersized posts or poor timber grading in the original build is a weaker candidate for like-for-like repair, since fixing the immediate damage doesn't address why it failed in the first place.
In that situation it's worth being upfront that a repair matching the original spec may fail again on a similar timescale, and that a modest upgrade in post size or footing depth at repair time is often better value than repeating the original approach.
Courtyard gates and proportion
A courtyard gate typically spans a wider opening than a standard garden gate while still being a pedestrian rather than vehicle gate, which means its frame needs extra bracing to resist racking over that wider span without the benefit of a narrower opening's inherent stiffness.
Getting the proportion of stiles, rails and bracing right at this scale matters more than on a narrow gate, where the frame is naturally stiffer regardless of detailing.
Hitting shallow services and CAT scanning
Electricity, gas and water connections into a house are often shallower than people expect, sometimes under 300mm in an older garden, well within reach of a hand auger let alone a mechanical one.
A cable avoidance tool (CAT scan) before digging a new post line is standard practice near any suspected service run, and is far cheaper than the cost and risk of striking a live cable or a gas pipe.
Where a scan can't rule out a service with confidence, hand-digging trial holes to confirm depth and position before committing to auger the rest of the line is the safer approach.
Use Class 4 versus Use Class 3 timber
The European use-class system grades timber by the exposure it's treated to withstand: Use Class 3 covers timber above ground but exposed to weather, such as capping or fascia boards, while Use Class 4 covers timber in ground contact or fresh water, such as posts.
A Use Class 4 post buried in soil needs a deeper, longer-lasting retention of preservative than a Use Class 3 rail bolted between two posts, because the ground contact zone stays damp for far longer than an exposed but well-drained horizontal timber.
Specifying the wrong class isn't always obvious at installation, since both can look identical when new, but it shows up years later as premature rot concentrated at ground level rather than along the whole length.
Buried rubble and old foundations
Gardens that once held an outbuilding, air-raid shelter or earlier boundary wall often still have its foundation strip sitting just below turf level, invisible until an auger or spade hits it.
A shallow concrete strip footing crossing the fence line usually needs breaking out locally rather than working around it, since a post can't be reliably set on top of a narrow buried footing.
Where old foundations run the length of a boundary, it's worth probing the full run before quoting rather than assuming one trial hole represents the whole job.
UV stabilisers in composite and PVC fencing
UV stabiliser additives are blended into composite and PVC fencing products during manufacture to slow the surface degradation and colour fade that ultraviolet exposure otherwise causes in polymer materials over time.
Products with a lower proportion of UV stabiliser, often reflected in a lower price point, tend to show chalking, a dusty faded surface, and colour loss earlier than better-stabilised equivalents exposed to the same sunlight.
South and west-facing runs receive substantially more cumulative UV exposure than shaded or north-facing runs, so the same product can visibly fade at different rates depending purely on orientation and surrounding shade.
Public liability considerations on a shared boundary
Work that takes place on or near a shared boundary inherently affects two properties, which is one reason contractors carry public liability insurance covering damage or injury arising from the works, generally quite separate from any specific job guarantee.
Clients are entitled to ask to see a contractor's current public liability certificate before work starts, and for jobs involving excavation near a neighbour's structure or a shared wall it's reasonable practice to confirm cover explicitly rather than assume it.
This is a generic industry consideration rather than a claim about any particular policy, and the details of cover, exclusions and limits vary between insurers and should be checked directly with the provider.
Gaps at party walls and stepped brickwork
Where a fence meets a party wall or a stepped brick boundary, an ill-fitting junction leaves a gap that undoes the security of the whole run, so infill panels or a scribed timber closer are cut to follow the step rather than left square.
On an older terrace the brickwork step is rarely uniform along its length, so each junction is measured on site instead of assuming a standard offset.
Diagnosing an uneven gap between gate and post
A gap that's wider at the top than the bottom, or vice versa, between a gate and its latch post usually indicates the gate has racked out of square rather than simply dropped evenly, which is a frame issue rather than a hinge-height issue.
Measuring the gap at both top and bottom before starting a repair helps distinguish a racking fault from a straightforward drop, since the two need different corrections.
Securing a rear alley boundary behind terraced housing
A rear alley boundary sees different pressure to a front garden fence, because it's typically unwatched, runs the full length of several properties, and is the route used to approach a back door or shed unseen from the street.
Consistent height and topping along the whole alley matters more here than on an individual plot, since a single weaker section among several stronger ones simply redirects the attempt rather than stopping it.
