Amazing Weatherboard Repairs Hacks

This article is about weatherboard repairs and hacks, which you can do yourself to save hundreds of dollars in expensive specialised tools and labour.

Weatherboards are the most common cladding system in Australia for houses with brick exterior walls, and in many other countries that we know of too!  They come in a wide variety of thicknesses, colours, shapes & forms.

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The reason they’re used so often is that they’re strong, durable & resilient to our harsh climate. 

The only problem is that over time weatherboards start to rot out due to damp conditions caused by things like excessive rain or lack of ventilation between them & brickwork/tiles. 

So what’s to be done?  In this article, we’ll share some fantastic weatherboard repair hacks which will bring your old weatherboard cladding right up to date.

We’ve tried all of the following methods ourselves and they work a treat for both timber & fibre cement boards, as long as you use a product suited for each. 

We also recommend going down the ‘proper’ route if you can afford it or have specialist skills because you want it to last, but if not these tips should help get you through!

Weatherboard Repairs Can Be Done In These 4 Easy Steps:

1. Cut out bad sections with a jigsaw or circular saw being careful not to damage the surrounding area any more than necessary.

2. Cut new sections to the same size, shape and design as the originals.  You can use a circular saw for this if you don’t have access to a jigsaw.

3. Apply weatherproof sealant such as ‘Pattex Restore’ or ‘Silicone Weatherproofing Sealant’ to both faces of each section before re-nailing into place with galvanised nails.

4. Re-attach trim pieces using a strong adhesive such as ‘Pattex One For All’.

The Tools You’ll Need:

These are the basics, obviously having some sort of pneumatic nail gun would be very helpful if you have one…if not your back will thank you for using nails with a longer shank.  Don’t worry though, it’ll still go much faster than doing it by hand!

The Weatherboard Repair Hacks You Need To Know:

1. Remove all the rotten boards & dispose of them safely.  Be sure to wear gloves and goggles just in case any contaminants could cause illness or harm.

  2. Using either sandpaper or an orbital sander clean off any residue left behind by old sealant/adhesive which may interfere with new sealant adhering to the board surfaces.

If you’re using a circular saw, ensure it’s fitted with a sharp blade before cutting out bad sections.  Don’t worry about rough edges as they’ll be covered up by the trim pieces which we’ll come to later.

 3. Using construction adhesive such as ‘Pattex One For All’ carefully glue each section together so that it stays in place while you cut & attach new boards or remove under-sill flashing if necessary.

Take your time and don’t rush this step as it’s important for a quality result.  We recommend using a small bead of adhesive rather than a large dollop because it spreads easier and is less likely to seep through to the other side of the board.

  4. Using galvanised nails & a pneumatic nail gun or hammer and nails, re-attach trim pieces where necessary.

If you’re using a pneumatic nail gun make sure not to over-drive any of your nails as this can damage sections of boards which you don’t want to do. 

As long as they’re driven flush into surrounding timbers then you shouldn’t have too much trouble though as they’ll be hidden out of sight. 

Also just like with glueing, take your time and don’t rush this step as it’s important for a quality result.

5. Apply weatherproof sealant such as ‘Pattex Waterproofing Sealant’.

This is the crucial final step that will make sure your weatherboard repair lasts, so take your time & apply several coats until you get a nice smooth/even finish.

6. Leave at least 24hrs before applying paint or re-hanging doors & windows.  Ideally, though aim for 3 days to be safe, although if you can leave it much longer then that’s even better!

7. Once fully dry after leaving for 3+days depending on how generous you were with sealant application, paint over with either exterior grade paint or enamel if using fibre cement boards which are already white…otherwise just match the original colour of your existing weatherboards.

If you’re lucky enough to have a matching paint colour then one coat of paint should do it, but if not be sure to apply several coats after allowing sufficient drying time.

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