Decking joist spacing and spans
Joist spacing under a deck is set by the board being used and the load expected, not fixed universally — timber boards typically need joists at closer centres than the equivalent composite board, because composite is generally less stiff across a span.
Manufacturers publish maximum joist spacing for their composite boards, and it's shorter still where boards run diagonally rather than square to the joists, since a diagonal run effectively increases the unsupported span between fixings.
Undersized joist spacing shows up as bounce or long-term sag between joists well before it becomes a safety issue, so it's worth checking spacing against the actual board spec rather than a generic rule of thumb.
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.
Matching fence specification to a site-specific threat assessment
Not every commercial boundary needs the same specification — a compound holding cash or controlled substances warrants a different height, mesh and topping to a low-value storage yard, and starting a quote from a fixed catalogue spec rather than the specific threat can lead to over- or under-specifying the job.
A short threat assessment covering what's inside the boundary, who has legitimate access, and what's happened on similar sites nearby gives a more defensible basis for the chosen spec than a generic default.
Letting-agent instructions and access arrangements
Work instructed through a letting agent rather than directly by the owner usually needs a written authorisation confirming who can approve variations to the quote, since the agent isn't always the person paying the invoice.
Key access for an occupied rental needs proper notice to the tenant under the tenancy agreement, typically at least 24 hours, and arranging a lockbox or agent-held key avoids a wasted visit if the tenant isn't home.
Where a fence sits between a let property and an owner-occupied neighbour, it's worth the agent confirming which side is instructing and paying before quoting, to avoid a dispute over cost once the job is done.
Splash-back staining from adjacent paving
A fence running alongside a patio, path or driveway picks up rain splash-back off the hard surface, which carries fine grit and, on older paving, residual cement dust that leaves a pale tide-mark along the lowest boards.
This band of discolouration is separate from general weathering and won't fade with the rest of the timber, since it is a surface deposit rather than UV bleaching.
A gravel strip or planting border between paving and fence line reduces the splash distance, and a periodic wash-down of just the lower boards keeps the tide-mark from building up permanently.
Incising for treatment penetration
Incising is the process of pressing a pattern of small slits into a timber's surface before pressure treatment, breaking through the outer layer so preservative can reach further into the wood than it otherwise would.
It's most relevant on species like spruce and whitewood, which have a dense, resistant heartwood-adjacent layer that untreated slits would leave largely unprotected, whereas naturally permeable species such as pine sapwood rarely need it.
The trade-off is a slightly roughened surface texture with visible slit marks, which is a fair exchange for genuine depth of penetration rather than a treatment that sits mostly on the surface.
Distinguishing checking from structural splitting
Surface checking, fine drying cracks confined to the outer face of a timber section, is cosmetic and doesn't usually run deep enough to compromise a post or rail's strength.
A structural split runs further into or along the timber, sometimes right through a section, and can significantly reduce the effective load-bearing area at that point, particularly if it passes through a fixing or joint.
The practical test is depth and location: a shallow surface check away from any fixing is rarely a concern, while any split intersecting a bolt hole, mortice or bearing point is worth assessing before continued use.
Highways not yet adopted on newer estates
On newer housing estates, roads and footways can remain unadopted by the council for a period after construction, sometimes maintained instead under a bond by the developer.
This can affect whether the 1m road-facing fence height limit strictly applies yet in the same way, since the technical definition of a highway used by vehicles depends partly on adoption status.
Checking with the council whether a specific new estate's roads have been formally adopted is worth doing before assuming which height limit applies to a road-facing boundary.
Gravel-board clearance over uneven ground
A gravel board sitting flush with the soil on one section of a run can end up buried a couple of inches by the time the ground rises further along an uneven boundary, trapping moisture against timber that was specified to sit clear of the soil.
Stepping the board height slightly at each post, rather than running one continuous level line, keeps a consistent clearance above grade along the whole run.
Concrete gravel boards tolerate this ground contact better than timber ones, which is one reason they're specified as standard on plots with visibly uneven levels.
