A bench that has spent a few winters outdoors tells you exactly how much weather it has seen. The surface greys, algae settles along the north-facing back rail, rainwater works into the bolt holes, and joints that were rock solid in June feel a little vague by March. Most of that is reversible. With one dry weekend, a few sanding discs and a tin of oil, a tired wooden bench can be brought back to something you are pleased to sit on.

Assess the Bench Before You Spend a Penny

Walk round it with a screwdriver and press the point into any spot that looks suspect: the bottom of the legs, the tenons where the arms meet the back, the ends of the slats where water sits. Sound wood resists. Wood that gives, or crumbles, has rot in it. Push and pull the bench gently to feel for movement at the joints, and check every bolt and screw for rust.

That five-minute inspection tells you which category you are in. If the frame is solid and only the surface is grey, this is a cleaning and oiling job. If a slat or two has gone soft, or a joint has worked loose, you are looking at a repair first. If the legs are rotten through at the base, replacement timber is often the cheaper answer — a joiner can cut and match new sections, though at that point a new bench may cost less than the repair.

Do the Repairs Before You Clean Anything

Sanding a wobbly bench just makes a wobbly, slightly cleaner bench. Deal with the structure first, while the wood is dry and you can see what you are working with.

• Loose joints. Work exterior-grade wood glue into the joint, clamp it, and leave it for the full cure time on the bottle. Use a polyurethane or D4-rated adhesive rather than standard interior glue.
• Tired fixings. Replace rusty bolts, screws and washers with stainless steel or galvanised equivalents. Rust stains bleed into timber and are stubborn to remove later.
• Splits and cracks. Shallow cracks that follow the grain are normal in seasoned timber and can be left alone. For a split running out of a screw hole or the end of a slat, drill a small hole just past the tip of the split to stop it travelling, then fill if you want a tidy finish.
• Small areas of rot. Cut out the soft timber, let the area dry, and rebuild it with a two-part wood filler or epoxy made for exterior use. Treat the surrounding sound wood with a suitable preservative, following the manufacturer's instructions.

Wash Off the Grime and Green Growth

Brush off loose dirt with a stiff hand brush, then wash the whole bench with warm water and a mild detergent, working along the grain with a soft brush. Algae and the black spotting that appears on damp, shaded timber need more than soap. A dedicated wood cleaner or a patio cleaner formulated for timber will lift both; test it on a hidden area first, leave it as long as the label advises, and scrub while it is still wet.

Rinse thoroughly with clean water and let the bench dry completely. A pressure washer on a narrow, high-pressure setting is a mistake: it furs the surface, raises the grain and forces water into joints and screw holes where it will sit and start rot.

Sanding and Brightening Grey Timber

That silver-grey colour is weathered timber, not dirt. Sunlight breaks down the surface fibres and they wash away, leaving a soft, pale layer. Sanding removes it, and the fresh wood underneath is usually a warm honey or tan colour.

1. Start with 80-grit paper on an orbital or belt sander, moving steadily along the grain. Never sand across it, or you will leave scratches that show through any finish.
2. Follow with 120-grit, then finish at 150 or 180. Any finer and the timber becomes too smooth for oil to soak in properly.
3. Hand sand the curves, mouldings and tight corners where a machine cannot reach.
4. Wipe off all dust with a cloth, then a brush or a vacuum, before you apply anything.

If the grey goes deep, or you are working on oak or teak with stubborn black water stains, a wood brightener based on oxalic acid will pull the colour back. It is a chemical, so wear gloves and eye protection, work outdoors, test on an offcut or hidden area first, and follow the dilution and rinsing instructions exactly. Let the timber dry for a couple of days before oiling.

Treating and Protecting the Wood

Two sensible routes. Oiling feeds the timber, keeps some flexibility in it and leaves a soft, natural sheen; it needs reapplying once or twice a year. A wood stain does the same job with added pigment, which also slows the greying process. Paint is an option, but only on timber that is bone dry and sound, and it hides rather than fixes damage.

Never oil a bench you plan to paint. Once oil has soaked in, paint will not adhere properly, and you will be sanding back to bare wood again.

With oil, apply a thin coat with a brush or cloth, keep the surface wet for twenty minutes or so, then wipe off the excess before it turns tacky. Two or three coats, with a day between each, is usually right for a dry, thirsty bench. Pay attention to end grain and the underside of slats — that is where water enters first.

Feet, Fixings and Winter

Most bench rot starts at the bottom. Stand the legs on gravel, paving or rubber feet rather than directly on soil or grass, so water drains away and air can move around the base. Keep fallen leaves and damp debris from collecting underneath, and check the fixings once a year, tightening anything that has worked loose.

If the bench lives outside all year, a breathable cover through the worst of the winter helps. Avoid plastic sheeting, which traps condensation against the timber; a woven, vented cover is far better. Bringing a bench into a shed or garage for winter adds years to its life.

A Yearly Routine That Keeps It Looking Well

Restoration is the big job; maintenance is small and steady. Once a year, in spring, wash the bench down, rub back any rough patches with 120-grit paper, and give it a fresh coat of oil or stain. Ten minutes with a cloth and a tin of oil beats a full sanding job every time. Do that, and the bench you restored this weekend will still be holding its colour — and your weight — a decade from now.

Photo: analogicus / Pixabay