Oak Hardwood Cladding Board – Reversible Half Lap Profile – 180×18 mm – 3000 mm (10 ft.)

Oak Reversible Half Lap Cladding Board

Oak has clad buildings on this island for a thousand years, and no timber you can specify today has a longer proven life on an exterior wall. Choose it for your facade and you get that heritage doing real work: a warm honey brown face, the deep open grain only oak carries, and a reversible half lap profile so you can set a crisp shadow line or a flatter lap before a board goes up. Stocked in our yard for delivery across Ireland, in a 180 mm face at 18 mm thick.

Why Oak?

Oak earns its reputation honestly. It sits in Durability Class 2, naturally resistant to rot, insect attack and fungal decay, which is why oak boarding on old buildings is still sound long after the paperwork was lost. The timber is dense, around 720 kg per cubic metre, and that density with the open grain gives a finished wall a depth that softer species cannot match.

That character comes with one honest quirk. Oak is high in tannin, the natural preservative behind its weather resistance, and tannin reacts with mild steel and galvanised metal to leave black streaks down your boards. Stainless fixings are not optional here. The timber is European oak, Quercus robur.

Installation guidance

Any competent contractor will find oak straightforward, as long as you plan for its weight. Fix with stainless steel only, A2 for most sites and A4 where the wall faces salt air, never galvanised or mild steel, which the tannin will stain. Pre drill near board ends so the dense grain does not split as the screw draws in. The reversible half lap lets you dry lay a few boards and pick the face and shadow line you prefer before fixing the run. Some fine surface checking will appear as the boards settle to outdoor conditions. It is normal, it is part of oak, and it takes nothing off the lifespan.

Finishing & maintenance

You have two good routes with oak and neither is wrong. Left alone, the boards silver to a soft grey over roughly twelve months, the lowest effort finish there is, and the patina flatters both period walls and sharp modern facades. Held with oil, the honey brown stays put, which asks a little more of you but keeps that warmth for good.

Most of our customers oil for the first year, then let the routine ease off. If you go that way, use a hardwood oil made for European hardwoods, and avoid film forming varnishes and ordinary deck stains, which sit on oak’s oily grain and peel. We stock the right oils, so ask us which suits your boards. Whichever route you pick, an occasional wash with a soft brush and clean water is all the wall needs.