Even a small roof leak can quickly soak insulation, damage ceilings and timber framing, create electrical hazards, and lead to mould if water keeps coming in.

This guide shows you how to find where a leak is actually coming from, stop it safely with a temporary fix suited to your roof, and avoid the mistakes that turn a small leak into a bigger one.

TL;DR

• Act immediately to limit damage. Catch the leak with a bucket, move valuables, and safely drain any water leaking from the ceiling. Turn off power if water is near electrical equipment and document the damage for insurance.
• Carry out the temporary repairs only if it is safe to get on the roof. Avoid DIY repairs during rain or high winds on wet or damaged roofs.
• Find out the source before you repair. Track the leak inside your home, look for moisture trails in the roof cavity, and then inspect the roof for damage to roofing materials, flashing, roof valleys, gutters, or storm damage.
• Match the temporary repair to the damage. Repair leaking roofing screws, patch small holes in the flashing with roofing-grade sealant, repair cracked roof tiles, apply a waterproof tarp over large openings, or clean blocked gutters/roof valleys.
• Check the repair before leaving it. Make sure the repair is secure, then watch for new drips, damp patches, or moisture that may indicate water is still entering.
• Call a roof plumber when the roof is unsafe, storm-damaged, structurally compromised, leaking in several places, involves electrical hazards, or the temporary repair does not stop the leak.

What to Do First to Stop a Roof Leak

• Locate the active drip inside your home and place a bucket or plastic bin underneath to catch falling water.
• Move furniture, electronics, and valuable items away from the splash zone to prevent water staining and electrical hazards.
• Stop water from spreading by covering flooring, furniture, and soft furnishings with towels or plastic sheeting.
• Shut off the mains power and call an electrician immediately if water leaks near light fittings, power points, or appliances.
• Examine the ceiling for a swelling bulge or sagging plasterboard where water is pooling. Poke a small hole in the centre of that bulge using a screwdriver to drain the trapped water safely into your bucket.
• Take clear photos of the leak and any resulting damage inside your home. Record the date and time you first noticed the leak, as your insurer may compare this with Bureau of Meteorology weather records if a storm caused the damage.

How to Stop a Roof Leak Temporarily

Once you’ve taken the necessary safety precautions, follow these step-by-step instructions to temporarily stop water from entering your home.

Step 1: Make Sure It’s Safe to Inspect or Repair the Roof 

Before planning any temporary repair, consider the weather and the condition of your roof. Do not climb onto the roof if:

• It is still raining
• The roof surface is wet or slippery.
• Strong winds are continuing after a storm or cyclone.
• The roof has obvious structural damage.
• Large sections of roofing have lifted or shifted.
• You cannot safely access the roof with the right equipment.

Onceit is safe to go on the roof, then move to the next step. 

Step 2: Gather the Right Tools and Materials

Before accessing your roof, gather the right equipment to make the repair safer, quicker, and more effective. 

Here is what you need: 

• A sturdy extension ladder positioned on stable ground
• Non-slip, closed-in footwear with good grip
• Protective gloves to reduce the risk of cuts from roofing sheets or flashing
• A torch or headlamp to inspect the roof cavity
• The repair materials you’ll need based on the type of roof damage. 

Avoid using household products such as silicone, duct tape, expanding foam, or general-purpose construction adhesives. They’re not designed to withstand Australia’s harsh weather conditions and can fail in the sun, heavy rain, or as the roof expands and contracts. 

Step 3: Find the Exact Source of the Roof Leak

Rainwater travels along roof battens, rafters, sarking, insulation, or roof sheeting before entering the ceiling and dripping, so you must know exactly where the water is getting in to repair it.

Start by identifying where the leak is visible inside your home. Watch out for water stains on the ceiling or walls, bubbling paint, damp plasterboard, mould growth or active drips during rainfall. This narrows your search to one section of the roof rather than the entire roof.

Next, if it’s safe and you can access the roof cavity, inspect it using a torch. Check the area above the ceiling damage for wet insulation, damp roof framing, water stains on timber, active drips, or daylight coming through the roof. Water often leaves visible trails as it runs along rafters or battens, so follow these trails uphill, as they can lead you closer to where the leak is entering the roof. 

From there, follow the moisture trail to nearby roof features such as the ridge cap, roof valley, skylight, roof vent, chimney, or solar panels. Noting these landmarks will help you find the same area when you look at the roof from outside.

Step 4: Inspect the Roof to Identify What’s Causing the Leak

You now know the likely location of the leak, so inspect the roof from outside. Grab a ladder and climb up onto the roof – start at the highest point above the suspected leak and work your way down, checking each roof component for damage that would allow water in.

Check the following areas:

• Roof covering: Check the roofing material for damage.
  • On metal roofs, look for rust holes, corrosion, loose/lifted roof sheets, separated sheet laps, dents and punctures, missing roofing screws, and cracked/deteriorated neoprene washers.
  • On tiled roofs, look for cracked, broken, slipped, or missing tiles and for damaged ridge capping, bedding, and pointing.

• Flashing around roof penetrations: Flashing stops water from getting around skylights, roof vents, chimneys, solar panel brackets, air conditioning units, antennas and roof-to-wall junctions. Check for lifted flashing, gaps, corrosion, cracked sealant or sections pulling away from the roof.
• Roof valleys: Roof valleys channel rainwater into gutters. Leaves and debris can block the valley, causing water to back up under the roof covering. Remove loose debris and look for corrosion, holes, cracks or damaged valley flashing.
• Gutters and downpipes: Blocked gutters or downpipes can cause water to back up under the roof sheets or behind the fascia. Look for debris, clogged gutters, overflowing downpipes, or gutters that have pulled away from the fascia.
• Storm damage: Look for lifted roof sheets, loose flashing, missing fasteners, dislodged ridge capping or damage from fallen branches. Do not attempt a temporary repair if the roof has major storm or structural damage; instead, arrange a professional inspection.

Step 5: Choose the Right Temporary Repair Method

Once you’ve identified the cause of the leak, choose one of the temporary repair methods below that matches the type and extent of the damage. 

Replace a Leaking Roofing Screw

Roofing screws are fitted with neoprene washers that create a watertight seal. Over time, these washers can harden, crack, or compress, allowing water to seep around the screw.

If only one or two screws are leaking:

1. Remove the damaged screw.
2. Install a new roofing screw fitted with a neoprene washer.
3. Tighten it until the washer forms a firm seal without over-compressing it. Avoid overtightening the screw, as this can crush the washer and create another leak.

Seal Small Gaps Around Flashing Using Roofing-Grade Sealant

If the flashing is securely fixed but water is entering through small gaps or deteriorated sealant, a roofing-grade sealant can provide a temporary waterproof seal.

Clean and dry the surface and then apply the sealant. Run a continuous bead along the gap to ensure it completely seals the opening without leaving any gaps.

This method is suitable for minor gaps around skylights, roof vents, chimneys, and other roof penetrations. It won’t solve leaks caused by loose, rusted, or damaged flashing, which requires replacement.

Patch Small Holes or Splits in a Metal Roof Using Self-Adhesive Tape

Small punctures, rust pinholes, or minor splits in metal roof sheeting can be covered with self-adhesive roof repair tape or a roof patch.

To apply it:

1. Remove dirt, loose rust, and flaking paint.
2. Wipe the area clean and allow it to dry.
3. Cut the patch so it extends beyond the damaged area on all sides.
4. Press it down firmly, smoothing out any air bubbles or wrinkles.

Temporarily Cover a Cracked Roof Tile

Cover cracked tile with heavy-duty waterproof plastic that extends beyond the damaged area. Tuck the edges of the plastic under the surrounding tiles to keep it in place and direct rainwater over the affected tile instead of through it.

Install a Temporary Roof Tarp for Larger Leaks or Storm Damage

If your roof has missing roofing sheets, broken roof tiles or large openings from a storm, a waterproof tarp can keep rain out until permanent repairs are done.

To apply it: 

1. Use a heavy-duty waterproof tarp large enough to cover the damaged area and extend beyond it on all sides. Avoid lightweight plastic sheets that can tear in heavy rain or strong winds.
2. Lay the tarp from a higher section of the roof so it extends past the damaged area. Smooth out any folds or wrinkles to prevent water pooling.
3. Secure the tarp with timber battens fixed over its edges. Don’t use bricks or concrete blocks, as they can shift or blow away in strong winds. 

Clear Minor Blockages

If your inspection found leaves or debris blocking the gutters or roof valleys, carefully remove them by hand or with a scoop to restore water flow. Then check that water drains freely into the downpipes. If water still isn’t draining properly, the blockage may be inside the downpipe and require further clearing or professional assistance. 

Step 6: Check That the Temporary Repair Is Working

When you finish the temporary repair, be sure the repair material is secured, the tarp is in place, or the replacement screw is sealed securely. Look for any gaps, loose edges or areas where water could still get in.

Then inspect the affected room for:

• New water drips.
• Damp patches spreading across the ceiling or walls.
• Water pools above the ceiling.
• More fresh moisture around the original leak.

Remember that ceilings, insulation, and timber continue releasing trapped moisture for hours or days after the leak stops. A few residual drips don’t necessarily mean the repair failed, but if you notice new water entering your home or the affected area continues to spread, you should call a licensed roofer right away.

Step 7: Arrange a Permanent Roof Repair

Delaying permanent repairs can turn a minor leak into a more costly problem. Ongoing water intrusion can damage insulation, ceiling linings, timber framing, and internal finishes, while increasing the risk of mould, timber rot, and corrosion.

Book a professional roof inspection as soon as possible to assess the full extent of the damage and repair or replace the affected roofing components. 

Final Thoughts

A temporary repair can help reduce water entering your home until a permanent repair can be carried out. But only attempt a temporary repair if you can safely access the roof, and you’re confident carrying out the work. If the damage is extensive, the roof is unsafe, or you can’t identify the source of the leak, contact a professional roof plumber immediately.

For fast, professional roof leak repairs in Townsville, contact our team at 1touch Plumbing today. Our licensed roof plumbers will identify the source of the leak, carry out lasting repairs, and help keep your home protected through Townsville’s wet season.