Practical points for boundary work in Theobalds Park
Ventilation requirements under a deck
A low-level deck with boxed-in sides and no airflow underneath traps moisture against the joists and the underside of the boards, which is one of the most common causes of premature timber rot on an otherwise well-built deck.
Leaving gaps in the skirting, or fitting purpose-made ventilation grilles, allows air to circulate beneath the structure and lets the timber dry out between wet periods rather than staying permanently damp.
Decks built very close to ground level with minimal void beneath them are particularly at risk and sometimes need a raised design specifically to allow enough clearance for airflow.
Feather-edge board overlap
Feather-edge boards are sawn to a tapered profile, thick along one edge and thin along the other, and are hung vertically with each board overlapping the thin edge of its neighbour by a consistent margin, typically 15-20mm.
Getting that overlap consistent matters more than it looks, since too little overlap opens sightlines and lets wind-driven rain through as the boards shrink, while too much wastes timber and adds unnecessary weight to the rails.
Because the boards taper, the overlap measurement is usually taken at the board's face rather than assumed from its nominal width, and a badly calibrated first board throws off the spacing for the rest of the run.
Bitumen paint on buried post bases
A bitumen-based coating applied to the section of a timber post that will sit below ground adds an additional moisture barrier on top of factory preservative treatment, aimed specifically at the zone in most sustained contact with damp soil.
It's a supplementary measure rather than a substitute for proper preservative treatment, since bitumen coating alone doesn't address fungal decay resistance the way a biocide-based preservative does.
The coating is usually stopped a short distance below the eventual ground line, since bitumen exposed to UV above ground degrades and can look unsightly, whereas below ground it's protected from sunlight entirely.
Setting gate posts before the rest of a fence run
Gate posts carry more load and need tighter tolerances on spacing and plumb than intermediate fence posts, so they're normally set and checked first, with the rest of the run measured out relative to the confirmed gate opening rather than the other way round.
Where a gate is ordered to a bespoke size, its exact opening width has to be locked in before that section of the run is built, since a fence panel either side can absorb small adjustments far more easily than a made-to-measure gate can.
A gate post is also usually set with extra depth or a wider concrete base than a standard fence post, given the additional leverage a swinging gate applies, so it needs its own dig rather than being treated the same as its neighbours.
Retail yards and car parks
Fencing around a retail unit's rear yard or customer car park usually has to satisfy insurer requirements for secured perimeters as well as simple boundary marking, particularly where stock or delivery cages are stored outside.
Vehicle impact is a real consideration in a car park boundary, and posts near a marked bay or turning circle are often specified heavier or protected by a bollard rather than relying on the fence itself to survive a low-speed shunt.
Work here is usually scheduled around trading hours and delivery windows, since blocking a rear yard during a delivery slot can hold up a retailer's whole day.
Working off a ladder without scaffold on fencing jobs
Most domestic fencing and gate work is low enough to manage from stepladders rather than needing scaffold, but a ladder still needs a firm, level footing and, on soft ground, a board or plate under the feet to stop it sinking unevenly.
Working at the top of a tall gate post or over a wall with a ladder means keeping three points of contact and avoiding overreaching sideways, which is usually the point a ladder starts to slide rather than tip.
Where capping or a top rail needs fixing along an entire run at height, moving the ladder in short, frequent steps is safer and generally faster than overreaching from a single position to save moving it.
