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How to fix dark spots on your exterior timber cladding

megan para head shot
Megan Parameshwaran August 25th, 2020

Have you ever had dark spots appear on your cladding during intallation? Well, we’re here to clear up the mystery for you!

Firstly, let’s cover off why you’re seeing dark spots…

Cladding is often installed into metal battens or in conjunction with aluminium window installations, which in turn produce metal shavings. When metal shavings are exposed to wet, blonde coloured timber, they will oxidise and result in dark spots in the space of 24 hours.

To demonstrate, we conducted an experiment of our own…

These dark spots can be wrongfully mistaken as mould – which is essentially impossible in IronAsh treated cladding. For example, IronAsh timber cladding is treated for decay and termites and cannot develop mould in such a short space of time.

But how to fix it?

Good news is that it’s an easy fix. Intergrain have created a product to clean the dark spots completely off!

Simply apply Intergrain UltraPrep Timber Cleaner to the affected areas and it’ll be as good as new.

The Intergrain UltraPrep Timber Cleaner is a high strength cleaner that contains naturally occurring, bio-degradable organic acids that will help restore and prepare weathered, grey, dark spots, rust or tannin stained affected timber.

Hot tip: to prevent any spotting, correctly store and protect the cladding from weather and keep wrapped as required until installation.

So there you have it, an easy fix to a simple problem.

Find out more about Intergrain’s UltraPrep here or IronAsh cladding here.