5 Signs Your Cedar Needs Attention

11 Sep 2025

Cedar needs to be recoated every 2-3 summers to protect the timber from New Zealand’s harsh UV rays.

By applying an oil or a stain, the boards are protected by a coating that takes the brunt of the UV rays, but over time, it will break down and needs to be reapplied.

Knowing what signs to look for will help you stay on top of maintenance before small issues turn into larger, more expensive problems.

1. Discolouration

Discoloration is often the first sign that your cedar needs attention. It happens when the UV rays begin to break down the existing coating, allowing the natural colour of the timber to come through.

A generously applied oil will fill the pores of the Cedar and leave a protective tint on the surface. This dual action helps the wood resist moisture and absorbs the worst of the sun’s rays.

With oil, you can tell if the Cedar is dry by spraying water onto the surface. If the water beads off, the boards still have a reservoir of oil. If the water soaks in, you probably need to recoat.

Stains work similarly, creating a barrier that shields the timber. Over time, the stain will oxidise and erode by design – this means it’s doing its job by absorbing the UV damage – resulting in a patchy, uneven appearance with lighter and darker areas.

2. Fading or silvering

Silvering is caused by exposure to UV rays, which fray and loosen the top cells of the Cedar and cause the surface to become bleached.

While some people prefer this aged appearance, it can be a problem in warm, damp climates. The roughened surface of the wood can trap moisture, dirt, and bacteria, causing the Cedar to turn black.

If you like the silvered look, you can get protective oils with a silver tint that will give you the aesthetic you want while still protecting your Cedar from the sun.

3. Patchy or uneven colour

Patchy or uneven colour on your Cedar can be a sign of a few things. The previous coating might have been applied unevenly, or it could be breaking down faster in some areas than others for a variety of reasons.

A well-maintained Cedar home should have a consistent colour across all its walls. If your home hasn’t been maintained in quite some time, the faces of the house that gets more direct sun exposure will fade faster than the shaded faces.

Reapplying an oil or stain not only enhances the colour but also helps replenish the wood’s natural oils and fortify its anti-fungal properties, restoring its vibrant, like-new appearance.

4. Mould and lichen forming

Mould and lichen often grow on the damper areas of your house away from the sun. Mould can appear on the surface coating or might be ingrained in the timber if it’s been left for a while.

The first signs of mould are small black spores that look like spots or splatters, and as it gets more severe it will get more obvious, turning black, green or red.

Signs of mould and lichen are not always a big concern. Get a professional to look at it, and if you catch it early enough, you might just need a clean without having to recoat the timber.

5. Cracks, or worse

Look for small cracks appearing, either in the coating or the boards themselves. Those little cracks are allowing moisture to get into the boards and create a toehold for mould, mildew and lichen to get established.

If nails are popping out, or you can see warping, this is a sign that the boards are moving a lot. This usually happens on the north face, or any area that is exposed to the sun and doesn’t have any protection against the wet-dry-wet effect.

If your boards are starting to cup, it doesn’t mean the boards are beyond repair. Often the structural integrity of the boards is still good, we just need to clean them up and replace the oil to reduce the surface tension and repel water.

Final thoughts…

Knowing the signs that your Cedar needs attention helps you make an informed decision about when to invest in its health.

If you’re unsure, it’s always best to have a professional take a look.

We offer a free, onsite Cedar Assessment across Auckland and Northland. One of our Cedar experts will provide a genuine assessment of your timber and offer advice to keep your Cedar protected and looking beautiful for years to come.

All Articles

12 Aug 2023

The Cedar Oil vs. Cedar Stain Debate

What debate? Oil is the way to go when it comes to cedar, no contest. While stain only coats the surface of the wood, oil works in partnership with one of cedar’s basic features. You see, cedar is a naturally oil-rich timber itself – it soaks up rejuvenating oil deep into its cells for up to a year after it’s applied.

“Should I use oil or stain on my Cedar?”

This is by far the most common question we get from Cedar homeowners and a source of some debate on the internet.

In our opinion, there is no debate (with a few caveats). For nearly all situations, treat Cedar with a penetrating oil such as Wood-X.

Oil works like moisturiser for Cedar, deeply replenishing the natural oils and keeping the Cedar protected – and looking great – for many years to come.

So, there we have it, debate closed. Oil is the way to go when it comes to Cedar, no contest. But if the answer is so clear cut, where does this debate come from in the first place?

To find out, read the full article, or watch the video below for a quick summary.

With Cedar, Location Is Everything

If we were having this conversation in the northern hemisphere, the answer would be the opposite: use a stain. Stains last longer and you will have a lot less maintenance over the lifetime of the Cedar.

In New Zealand, the situation is very different. We have some of the harshest UV rays in the world which extract the natural oils from the Cedar and dry out the boards. Over time, the boards will cup and eventually crack, leading to a costly replacement of your cladding.

Stains protect the boards from moisture and look great, but unlike penetrating oils, they do not replenish the natural oils extracted by the sun. They are designed to erode over time, often unevenly, and leave the timber unprotected and unsightly.

Caveats For Using Stain on Cedar

While oil is recommended for Cedar in nearly all cases, there are some situations where stain is more suitable.

If the Cedar has considerable shade with little to no UV exposure, using a stain instead of an oil might be appropriate. This is usually when a house is shaded by dense tree cover or has wide soffits, such as villas where the roof extends over the porch.

The soffits stop the weatherboards from being degraded by the sun. These well protected areas can be treated with a stain and will look great forever.

If in doubt, get in touch, we are always happy to give an expert opinion on which treatment is best for any given job.

Comparing Costs Between Cedar Oils and Stains

Over the long term, there isn’t much difference in maintenance cost between oils and stains. The real savings come when looking at the longevity of the Cedar boards over the lifetime of your home.

Stained Cedar will dry out in the sun, causing the boards to cup and warp faster, and increase the likelihood you will need to replace your boards. A costly solution to an avoidable problem!

The difference shows up when we’re preparing Cedar for restoration. Sanding stain may reveal unsuspected insect, sun or moisture damage. With an oil recoat on a well-maintained property, it’s just a gentle clean with a bio-degradable wash, a short drying period and the re-oiling itself.

Have any more oil vs stain questions? Send us a message or use the Live Chat below!

13 Jul 2023

Transitioning Cedar from Stain to Oil

As Cedar ages, we highly recommend transitioning Cedar from stain to a penetrating oil where possible. The simple truth is, no matter how much stain you put on the surface of the timber, 5-10 years of sun exposure on a northern face will deplete the natural oils of the Cedar and cause the boards to dry out, cup, then ultimately split.

As Cedar ages, we highly recommend transitioning Cedar from stain to a penetrating oil where possible.

If you want to know more about the pros and cons of each, please read our article The Cedar Oil vs. Cedar Stain Debate.

The simple truth is, no matter how much stain you put on the surface of the timber, 5-10 years of sun exposure on a northern face will deplete the natural oils of the Cedar and cause the boards to dry out, cup, then ultimately split.

This doesn’t just look bad, it threatens the integrity of your home to withstand the elements and if the damage continues, you may need to replace the cladding altogether.

How Stained Cedar Ends Up Looking Unsightly

Treating aged Cedar with stain isn’t usually an informed choice by the homeowner. Often, the previous owner has done a quick fix and used stain to make the Cedar look pretty before selling, or the current homeowner has stained over a poorly prepared stain without stripping back the boards.

Stains are translucent, so even though they have some opacity, you can still see through them and unless the preparation is done well, stains don’t hide imperfections.

Eventually the stain will delaminate in the harsh UV, giving a camouflaged look with light and dark shades that are often patchy and uneven.

The Transition Process from Stain to Oil

First, we will do a site visit to look at the current state of the Cedar boards.

In the best-case scenario, the weatherboards will have had an even exposure to the sun. We then use a strong solution of the oxy cleaner to get in behind any of the oxidised stain which has been broken down by the sun, then use a heavy wash to remove anything which is loose.

The heavy wash will give us a good look at the condition of the boards below. If there is any stain remaining on the surface, we will need to sand or strip the boards back to their virgin state before applying the oil.

If the boards have had partial shade cover, such as nearby trees or soffits that have only protected the upper areas, they need to be stripped. You can’t just oil over the top and hope that it’s going to match the weatherboards below.

This adds a lot of cost to the process and if the homeowner isn’t willing to spend that much money, we may recommend applying another coat of stain to provide at least some protection and keep the house looking tidy.

Be Prepared for the Shiny-flat Look

One of the biggest downsides of moving from stain to oil is a 3-9 month transition period where your Cedar will have a shiny-flat-shiny-flat look.

This happens when oil is applied to any surface that still has stain remnants. The oil cannot soak through the stain as it is non-porous, so it sits on top, around the surface area where the oil has soaked in, giving the shiny-flat-shiny-flat look.

In the sunlight, the shiny-flat-shiny-flat look is not pretty. However, this effect is only temporary and after 3-9 months the oil eventually soaks in behind the stain and the stain will delaminate further.

After 3-9 months, we will come back and give the boards another heavy wash, sand back any remaining stain and apply another coat of oil. 9-12 months later we repeat the same process. After 12-24 months the process will be complete and the Cedar will move into a regular maintenance schedule, with sun exposed areas being treated every 2-3 summers.

What Costs Are Involved?

Cost is the final hurdle for many Cedar homeowners. Stripping off stain is an expensive process and if your current home is not your forever home, the costs might be prohibitive.

However, if you are planning to stay in your current home for the foreseeable future, the costs become an investment that will pay for itself. Over time, oil is much easier to apply than stain, provides superior protection against the elements and increases the lifespan of your Cedar.

In broad terms, it comes down to this: do you want to spend the extra 10k to remove the stain and give yourself an easy to maintain finish, or deduct the 10k from the cost of replacing the cladding in the not-to-distant future?

By investing in the health of your Cedar now, you will save money on long-term maintenance, and your cladding will look amazing.

Get An Expert Opinion!

As you can see, there are a lot of variables when considering the transition from stain to oil. This article is intended to educate Cedar homeowners on the general process, but nothing compares to having one of our team visit your house and make a professional assessment.

For a free Cedar Assessment, get in touch by calling 0800 298 298. There is no obligation and our goal is always to look after the best interests of our customers over the lifecycle of their homes.

14 Jun 2023

Cedar Maintenance Advice for Newly Built Homes

Cedar is a miracle timber if ever there was one: durable, long lasting, rot resistant and a superior insulator – warm in winter and cool in summer. Not to mention it looks stunning.

Congratulations on purchasing your newly built Cedar home!

Cedar is a miracle timber if ever there was one: durable, long lasting, rot resistant and a superior insulator – warm in winter and cool in summer. Not to mention it looks stunning.

But like any outdoor timber, Cedar will require maintenance to stay in optimal condition.

New Zealand’s UV rays are some of the harshest in the world and they will eventually dry out the Cedar, leading to fine cracks and a roughening of the surface. This can commonly be seen in Cedar houses that have been left to “silver off”.

By starting Cedar maintenance early, you can get ahead of costly maintenance further down the line and keep your cladding looking just as beautiful as the day you moved in.

When To Start Cedar Maintenance

We recommend starting Cedar maintenance after two summers.

At this point, you may be wondering why we are talking about maintenance for a house that has just been built two years ago? Fair question!

While fresh Cedar boards do have a reservoir of natural oils that will keep them protected for longer, the boards have now been exposed to the sun for two summers and the natural oils are already being depleted.

It’s also worth noting that although you just recently moved, the Cedar may have been installed up to 3-6 months before that, so this process is well underway.

What Does Cedar Maintenance Involve?

For most new Cedar homes, maintenance consists of a soft wash and a recoat of sun exposed areas.

Our soft wash is an oxy-wash solution that removes any built-up organic matter – dust, pollen and spores – and leaves the Cedar fresh and vibrant.

Applying a recoat of oil will replenish the Cedar’s natural oils, fortify existing anti-fungal properties and enhance the colour tone, retaining the vibrant look of freshly installed Cedar.

After the initial treatment, sun exposed areas need to be maintained every 2-3 summers. The rest of the house may not need any maintenance for 5-7 years, apart from a light wash to remove built-up organic matter.

How Much Does Cedar Maintenance Cost?

This depends on the house size, ease of access and if scaffolding is required, but as a rough guide, the initial treatment of a single-story house with good access can cost anywhere between $4-5k.

A larger house with multiple stories can cost anywhere between $8-9k, plus you may need to include the cost of scaffolding on top of that.

However, after the initial treatment of the whole house, the cost of regular maintenance drops by 40-50% as only the sun exposed areas need maintaining.

If you have bought a Cedar house in a new development, chances are you are in the same maintenance schedule as the houses around you. By pooling together with your neighbours, we can often spread fixed costs (such as a cherry picker) across the all the involved parties.

Protecting Your Investment

A new house is an investment, possibly the most expensive investment you will ever make.

By regularly maintaining your Cedar, you are protecting the long-term value of your property and investing money now to get a higher resale value if you decide to sell.

Regular maintenance is also more cost effective than undertaking restoration just before you are ready to sell – and you will get to enjoy the beautiful look of freshly maintained Cedar while you are still actually living there!

Showing 1 - 10 of 16

0800 298 298

0800 298 298

5 Signs Your Cedar Needs Attention