Why original floorboards are worth the effort

There is a particular pleasure in an old floorboard: that soft, slightly hollow creak underfoot, the way the grain catches the light, the fact that it has been walked on by generations before you. In a Victorian terrace, a Georgian townhouse or a stone cottage, the boards were cut from slow-grown pine, oak or elm and have been seasoning in place for a century or more. Modern replacements are rarely as wide, as tightly grained or as warm in colour, and they seldom sit as well against old skirting.

Lifting them also gives you access to the space beneath — joists, pipes, cables and the void where insulation ought to go. It is dusty work, and it takes longer than you expect, but the result is a floor with a depth that no engineered board can imitate. Treat the timber gently and it will outlast most of what you could lay on top of it.

Lifting the first board without splitting it

Start where a board is already damaged, or at the edge of the room where the skirting hides the worst of any mistakes. Old floors are usually fixed with cut nails, which grip fiercely, so patience matters more than force. A wide bolster chisel and a claw hammer will lift the first board; slip a pry bar underneath only once you have a gap.

• Tools worth having: bolster chisel, claw hammer, floorboard saw or oscillating multi-tool, pry bar, pencil, tape measure and a pad of sticky notes.
• Cut the nails, do not lever them out: a floorboard saw slipped down the gap between boards will sever the nails and save the edges.
• Number every board on the underside with a pencil as you lift it, so each one goes back in its original position.
• Lift only what you need. Removing a whole floor is rarely necessary and makes the relaying far harder.

Work from one side of the room inwards, stacking boards flat rather than leaning them against a wall, where they will bow. If a board splits, keep the pieces — a clean break can be glued and clamped during relaying.

Inspecting and repairing the joists

With the boards up, you can see what is really holding the floor. Probe each joist with a bradawl, particularly near the ends where they sit in the wall, and look for softness, frass or the telltale flight holes of woodworm. Small areas of rot can be cut out and treated with a preservative; a joist that has lost more than a quarter of its depth should be sistered with a new length of matching timber bolted alongside.

Bounce and squeaks usually come from movement rather than decay. Fit noggins — short blocks of timber — between the joists at mid-span to stiffen the floor, and pack any gaps at the wall plate with slate or hardwood wedges rather than plastic. Check that air bricks are clear and that any new insulation leaves a gap for ventilation, or you will simply create rot somewhere else. While everything is open, note the position of pipes and cables so you can avoid them when nailing the boards back down.

Sanding gently — and why less is more

Old boards are often thin, and many have been sanded before. Aggressive machining removes the dark lines of the grain and the soft patina that makes them worth saving. Punch every nail head well below the surface first, then sweep and vacuum thoroughly.

• Start with an 80-grit belt only if there is old varnish or paint to remove; otherwise begin at 100 or 120.
• Work with the grain, keeping the machine moving. A diagonal pass is acceptable only on badly cupped boards, and should be followed by two passes along the grain.
• Finish at 150 grit. Going finer can burnish the surface and prevent the finish from soaking in.
• Edges and corners are best done with a random orbital or corner sander, using a light touch so you do not round over the board edges.

A drum sander cuts fast and can dish a floor in seconds, so hire one only if you are confident. A belt sander is slower but far more forgiving. Wear a proper mask — old finishes and dust are not things to breathe in.

Finishing with hardwax oil

Hardwax oil is the right choice for old boards. Unlike varnish, it soaks into the timber and hardens within the fibres, so the floor keeps its natural feel rather than acquiring a plastic sheen. It also allows spot repairs: a scuffed patch can be re-oiled without sanding the whole room.

Apply thinly with a brush, roller or cloth, working in sections of a few square metres. Leave for twenty minutes, then buff off any excess with a clean cloth — do not let it pool in the gaps. The first coat will look patchy; that is normal. Wait eight to twelve hours, then apply a second thin coat and buff again. Keep the room warm and ventilated while it cures, and stay off the floor for at least twenty-four hours. Furniture can go back after two or three days, but leave rugs for a fortnight so the timber can breathe. High-traffic areas will want a fresh coat every year or two.

Living with gaps, draughts and seasonal movement

Gaps between boards are part of the character of a period home, and filling them all with rigid compound is a mistake — the timber will move, and the filler will crack. If a draught is genuinely troublesome, lift the boards again and insulate from below, or fill the widest gaps with slivers of matching pine glued in place and planed flush.

Old boards shrink in winter and swell in summer. Keep the room at a stable humidity, avoid washing the floor with a wet mop, and let the floor do what it has always done. A rug here and there, a little wax and a good sweep will keep it looking loved for another hundred years.