Water-Damaged Timber Floors: What to Do in the First 48 Hours

A split dishwasher hose, an overflowing washing machine or a burst pipe can soak a timber floor in minutes. The first instinct is to rip up the swollen boards or turn the heaters up full. Both usually make things worse.

What you do in the first 48 hours has a big effect on how much of the floor can be saved and how smoothly an insurance claim goes. Here's what to do, in order. I've worked on water-damaged floors around Sydney since 2006, and the floors that recover best are nearly always the ones where someone followed these steps early.

First: make it safe

Water and electricity don't mix. If water has reached power points, appliances or anywhere near the switchboard:

• Turn the power off at the switchboard, but only if you can reach it without standing in water.
• If you can't do that safely, keep everyone out of the area and call an electrician.
• If the water came from outside, a sewer or a flood, treat it as contaminated. Don't handle it without protection, and get professional cleaning help.

Hour 1: stop the water

Turn off the tap to the appliance, or the main water supply to the house. In most Sydney houses, the main tap is near the water meter at the front of the property. Then call a plumber to find and fix the source. No floor repair should go ahead while water is still getting in.

Hour 1 to 2: photograph everything, then start cleaning up

Before you move or throw anything out, take photos and video of:

• The water on the floor and how far it spread.
• The source, like the split hose, the failed fitting or the leaking pipe.
• Damaged furniture, rugs and skirting.

Keep the failed part if you can. Then start cleaning up straight away. Insurers generally expect you to take reasonable steps to stop the damage getting worse, so don't wait for an assessor before getting water off the floor. Call your insurer early, check what your policy covers and keep receipts for anything you hire or buy.

Photos first, then towels. Your insurer will want both.

Hour 1 to 4: get the water off and out

• Use a wet-and-dry vacuum, mops and towels to get standing water off the surface.
• Lift wet rugs and mats and take them outside. A wet rug holds water against the boards.
• Move furniture off the wet area. Metal feet can leave rust stains on wet timber.
• Wipe water out of the gaps between boards as best you can.

Floating floors are different. Engineered, laminate and hybrid floors are often laid floating over an underlay, and water can run underneath and sit there out of sight. If water has reached the edges or joints, the floor may need lifting to dry what's underneath. Mention this when you call your insurer.

Day 1 to 2: dry it slowly and evenly

The goal is steady drying, not fast drying.

• Open windows if the weather is dry. Close them if it's humid or raining.
• Run fans across the floor, not pointed straight down at it.
• Use a dehumidifier if you have one or can hire one. Air conditioning on a dry setting can help too.
• Keep the room at a normal, comfortable temperature.

Don't aim heaters, heat guns or hair dryers at the boards. The top dries much faster than the underside, which can crack and split the timber and make cupping worse.

Watch for a musty smell or spots of mould on skirting, walls or under rugs. Mould can start growing within a day or two in damp, still conditions, so if you see it or smell it, mention it to your insurer and get it dealt with.

What your floor will look like over the next few weeks

Expect it to look worse before it looks better. Wet boards swell, and the edges usually lift into a cupped shape. As they dry, many boards flatten noticeably on their own. Some stay cupped, cracked or stained.

That's why it's worth waiting before deciding which boards to replace. It's hard to tell a board that will settle from one that won't until the floor has dried, and moisture readings are the only reliable way to know when that's happened. The calendar isn't.

What not to do

• Don't rip up boards straight away. Many recover once dry, and replacing them early can mean replacing more than you needed to.
• Don't sand cupped boards while they're still wet. When they dry, the floor can end up higher in the middle of each board than at the edges.
• Don't nail or screw down lifted boards to flatten them. The moisture is still in there.
• Don't cover the wet area with rugs, plastic or furniture. Leave the boards open to the air.
• Don't throw away damaged materials until your insurer says you can.

Which floors can be saved?

Black or dark grey staining is a common one on hardwood. Water reacts with the tannins in the timber, and the stain can go deeper than sanding can reach. Those boards are often better replaced, but they need checking first.

Matching the repair to the rest of the floor

When damaged hardwood boards are replaced, the new ones won't match perfectly at first. New timber is usually a different colour from boards that have aged in the sun for years. The best results usually come from replacing the damaged boards and then sanding and coating the whole room together, so the floor reads as one surface.

Our guide to matching new floorboards to existing hardwood covers species, sizes and colour. Our floorboard replacement service explains how individual boards are cut out and replaced.

If you're making an insurance claim

Every policy is different, so check yours and talk to your insurer. A few things that usually help:

• Your dated photos and video from before the clean-up.
• The failed part, and the plumber's invoice or report on the cause.
• A written quote that sets out which areas are damaged, what's being replaced and why.
• The product name or species of your floor, if you know it, for matching.

Ask your insurer what they need from a flooring quote. A clear written scope makes it easier to compare and approve.

Handle it yourself, or call someone in?

The first 48 hours are on you. Make it safe, stop the water, take photos, get the water off and dry the room slowly. Doing that well saves more boards than anything a tradie can do later.

After that, you need moisture readings and someone who can tell a board that will settle from one that won't. That's where Jimmy comes in. Our water-damaged floorboard repair service explains the drying, assessment and repair process in more detail. If the floor has cupped, you might also find our guide to gaps and cupping useful.