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Why should you always buy one extra pack of flooring?

Because flooring is produced in batches with different colouring — in two years you may not be able to buy the same floor again, and then three damaged boards can mean a whole new floor.

The batch is the real reason

A floor has a product number, but it also has a batch number, and it is the batch that decides how it looks. Wood flooring is made from timber grown in different places and dried in different runs; laminate and vinyl are printed with patterns that get adjusted between production runs; tiles are fired in kilns where small temperature swings produce visible shade differences.

That is why the label on the pack carries a product number, a batch number and — for tiles — often a shade code as well. Two packs with the same product number but a different batch are not the same product visually. The difference is small pack against pack, but it is obvious when two batches sit side by side in the same room in the side light from a window.

So file the batch number and shade code in your home folder together with the receipt. Even if the spare pack goes missing, you will still have something to ask the retailer to search for.

What the spare pack is actually for

The spare pack is not a buffer for a miscalculation. It is for what happens after the floor is laid — and there are four classic cases:

• Water damage. A leaking dishwasher or washing machine typically ruins 1-4 m² of flooring around it. A floating click floor can in many cases be taken apart from the nearest wall and reassembled with new boards — if you have the boards.
• Mechanical damage. A moving box, a furniture leg without felt pads, a dropped pot. One board with a deep mark in the middle of the living room.
• Renovation. You remove a light partition wall, and there is now an 11 cm wide strip with no flooring straight across the room. This is the most predictable of the four — and the one where people most often regret not buying extra.
• A new door or a new installation. A doorway is moved 40 cm, and the flooring has to continue where the frame used to stand.

In all four cases the alternative without a spare pack is the same: either a visible colour break, or relaying the whole room.

How much extra is "one extra pack"?

The rule is not "10% extra". The wastage of 5-20% is already built into what you order — it becomes offcuts in the container, not spares. The spare pack is added on top of that figure, and it must remain unopened.

Worked example: The floor area is 17.37 m². Straight lay, 7% wastage: 17.37 × 1.07 = 18.59 m². The pack covers 2.22 m²: 18.59 ÷ 2.22 = 8.37 → 9 packs. The spare pack takes it to 10 packs = 22.2 m².

Rules of thumb for how much spare makes sense:

• Up to about 30 m²: 1 extra pack.
• 30-80 m²: 2 extra packs.
• Over 80 m², or flooring that runs through the whole home: 2-3 packs, or about 3-5% of the area.
• Tiles: at least 1 box, and preferably 2 for large-format tiles — a single cracked 60 × 60 cm tile empties a small spare fast.
• Discontinued or clearance stock: 2-3 packs. Here there is no chance of reordering at all.

The spare pack measured against the alternative

An extra pack is one item added to an order you are placing anyway. If it is missing later, the alternative is relaying the whole room: flooring for the whole area, labour, moving furniture out and back in, skirting off and back on, and perhaps a door that needs trimming at the bottom. The two are nowhere near each other in size, and that is why the spare pack pays for itself in almost every case where something goes wrong: water damage, mechanical damage, a wall removed, or a door moved.

Also check the shop's return policy before you order. Many retailers take unopened packs back within a period after purchase, but the deadline and terms are the shop's own, and some charge a fee for it. If your retailer has that arrangement, the extra pack is effectively free: you can return it if it turns out you feel it was unnecessary. Never buy extra instead of calculating properly, though — a return policy does not cover ordering three packs too few and having to bring home a whole new batch.

How to store the spare pack so it can still be used

• Unopened. The packaging maintains the moisture balance. An opened pack in a cold garage absorbs moisture and warps.
• Indoors, lying flat. Not in the garage, not in a damp basement room, not stood on edge against a wall. A dry loft or a cupboard is ideal. Wood flooring generally needs to be stored at the same temperature and humidity as the room it will be laid in — the supplier's instructions give the range.
• Labelled. Write the room, date, product number and batch number on the pack with a marker. In seven years no one will remember whether the pack in the loft belongs to the living room or the bedroom.
• With the receipt. Keep the receipt and the laying instructions with the pack or in the home's papers. The instructions contain the figures a future repair needs to follow — joint width, offset of end joints, permitted moisture content.

The same applies to tiles and skirting

The principle is not specific to wood flooring. Tiles are fired in batches with shade codes, and a single spare box is standard practice for any tiler. Skirting boards and transition profiles are also discontinued — and a skirting board in a profile that no longer exists forces you to replace the skirting in the whole room to make it match. Buy 1-2 extra lengths at the same time.

Write it down while you remember

The spare pack is only half the value. The other half is knowing how much flooring is where, and which floor it is. If you have a measured floor plan of the home with the area per room, you can answer five years later how many square metres are needed to relay the living room — without measuring again. HouseSense stores that plan with areas per room in your own iCloud, together with the rest of the home's information, so both the spare pack's batch number and the square-metre figure live in the same place as the rest of the home's papers.