Frequently Asked Questions

Why do I need to treat my cedar cladding?

Although cedar is chock full of natural preservatives, over time moisture, heat and UV light gradually deplete these preservatives leaving the cedar vulnerable. This depletion of preservatives allows water to enter, causing it to expand and contract, creating gaps for algae, mildew and moss to grow, with rotting, curling and silvering further damaging the wood.

How do I know when it's time to treat my cedar?

The best time to treat any external cedar structure is before any damage begins – prevention is key. Treating timbers that are already severely damaged will not fix the problem. As mentioned above – prevention is key! 

New Zealand weather is notoriously humid and moisture is one of cedar's main threats. The other one is UV light, which damages the wood by stripping it of lignin and exposing the white cellulose fibres giving it a grey, washed out appearance.

A good timber treatment can be compared to a good waterproof UV sunscreen that not only shuts out harmful rays but keeps the wood moisturised, dry and protected from weather damage.

If you have any doubt about the condition of your cedar structures, it is always best to contact a CDR professional who can offer you obligation free advice and if necessary, a quote. 

Can't I just paint over damage with a good waterproof paint or varnish?

No. Neither varnish nor paint can stop or treat any damage to wood. UV light can easily penetrate varnish causing further damage. Because paint and varnish create a surface film, when the timber heats up in the sun any trapped moisture tries to exit through the film causing blistering and worse, hiding currently existing damage that needs treatment.  Preservatives are essential to replace lost oil and resins. To protect your cedar investment, use only timber treatments specifically designed to treat and preserve exterior cedar timber structures.

Why do I need a pigmented product

The pigment is the main product that protects the wood from UV light, which causes the silvering of the wood.

Can I treat the timber myself to save on cost?

You can, but bear in mind that cedar treatment and restoration is a specialised area. Our CDR cedar specialist will be better informed on which products to use and how much product is needed based on the extent of the damage, the immediate environment, exposure to elements such as wind, sea air and temperature, and sun. Also, it is the cleaning of the timber that is the most crucial part of the restoration process. 

Given that well maintained cedar wood can add so much value to your property, cutting costs by shortcutting essential treatments is never a wise option.  

My house already has a product on it, can it be oiled?

Sometimes it is best to stay with that product. It may be more cost effective to maintain that product than to change it.

CDR have successfully stripped many different coatings. CDR are happy to discuss options and expected out comes with you. 


"Cedar Doctor has a great customer service ethic that exceeds your expectations. 

The finished product brings your home back to “new” and if you follow-up with the maintenance re-oiland stain in the next 12 months, it ensures you home returns the ‘new look’ for years. 

John and his team offer a very professional service. We would consider using this company again and we would recommend to friends..."


Trade Enquiries

We treat your home with the same care and attention as we do you, which is why we have the Exterior Maintenance Program for our valued customers. 

As part of the program, Cedar Doctor will periodically visit to give you personalised recommendations and maintenance solutions based on the condition of your cedar.


About CDR

John and Ana Skellon established CDR in 2005 and between them have extensive experience in the business of wood restoration.  They now work in partnership with an experienced team of tradesmen to refurbish external cedar cladding, timber decks, garages and entrance doors.  

7/11 Silverfield, Wairau Valley, Auckland, 0627, New Zealand
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