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How to replace rotten weatherboards

A replacement weatherboard being drilled into with a power tool

Overview

Learn how to cut out the damaged part of a rotten weatherboard on your external wall. Watch our easy to follow step-by-step video and find out how to cut and remove the rotten board. You'll then find out how to attach a new weatherboard. 

Steps

1Locate the stud positions

In this video we are replacing two rotten weatherboards. First, remove window frames or drain pipes so you have access to the damaged section of the weatherboard. Use the stud finder to locate the nearest stud. Mark the centre of the stud. Draw a line down the weatherboard at the stud centre to show where to cut.  Make the next stud along on the lower weatherboard. This means your joins will be staggered. 

A stud finder being used to locate the stud wall behind weatherboards

2Cut through the rotten board at the stud

Join two weatherboards and measure the depth of the thinnest part plus the thickest part of the board. Set the circular saw depth to this.  In this example it is 25mm. Cut along the line on the rotten weatherboard and slightly into the board above. Fill this cut later. Use the hammer, chisel and pinch bar to remove the damaged board. 
A rotten weatherboard being cut through with a circular saw

3Measure and cut the new weatherboards

Measure the width and cut the new weatherboards to size. Insert the bottom board and pre drill holes at the studs. Nail the new weatherboard to the stud. Insert the top board in place and pre drill. Then finally nail into place. 
A replacement weatherboard being drilled into with a power tool

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Health & Safety

Asbestos, lead-based paints and copper chromium arsenic (CCA) treated timber are health hazards you need to look out for when renovating older homes. These substances can easily be disturbed when renovating and exposure to them can cause a range of life-threatening diseases and conditions including cancer. For information on the dangers of asbestos, lead-based paint and CCA treated timber and tips for dealing with these materials contact your local council's Environmental Health Officer or visit our Health & Safety page.

When following our advice in our D.I.Y. videos, make sure you use all equipment, including PPE, safely by following the manufacturer’s instructions. Check that the equipment is suitable for the task and that PPE fits properly. If you are unsure, hire an expert to do the job or talk to a Bunnings Team Member.