Why 97% of our customers pick a roof treatment
You want the moss and lichen gone, the roof looked after, and one less job on your list.
For many roofs we look after across Whangārei and Northland, a treatment can do that gradually, with less water and a lower cost than a full wash.
The key question: do you need the roof to look clean straight away, or can you give the treatment time to work?
A dirty roof does not always need washing
A roof wash removes visible growth and grime during the visit. A roof treatment works gradually:
- We apply a product to target moss, mould and lichen.
- The growth dies while the treatment stays on the roof.
- Sunlight and rain gradually break down and clear what remains.
If you do not need an immediate visual result, treatment can get the maintenance underway without the extra work and cost of washing the whole roof.
What we have seen since 2012
We have never needed to wash a roof that we regularly treat.
That is our experience of the roofs we maintain. Results still depend on the roof and its surroundings.
Why treatment usually costs less
Washing means working across the roof to remove growth, while managing water, access and safety. Treatment generally takes less application time and uses much less water.
One roof, two very different jobs
On one of our roof-cleaning jobs:
- Washing took 22 hours.
- The follow-up treatment took 2.5 hours.
These were two stages of the same job. They show how washing adds labour, rather than predicting the time or saving for your property.
Your quote depends on the roof’s size, pitch, height, access, material and amount of growth.
How long will results take?
A treatment will not leave the roof visibly clean on the day. You need to allow time for the weather to clear the dead growth.
- Two to three months: improvement is often visible.
- 12 to 18 months: heavy or established growth can take this long to clear fully.
These are field observations. Growth, roofing material and weather all affect the timing.
Matching the treatment to your roof
- Light growth: a single application may be enough.
- Heavy lichen or black mould: two applications during the same visit may be needed.
- Extremely heavy growth: a gel treatment may also be needed.
We assess the roof first. See our roof treatment and roof washing options for more detail.
When is a roof wash the better choice?
A suitable wash may make more sense when you are:
- Preparing the roof for painting.
- Getting ready for photos or an open home soon.
- Wanting visible growth removed straight away.
If you are planning a sale well ahead of time, treatment may suit. Allow for a variable clearing period that can reach 12 to 18 months.
We select the washing method for the roof’s material and condition. After washing, we include a follow-up treatment to deal with remaining biological growth and slow its return.
Selling after a treatment?
We can provide a Completion of Works Certificate recording the treatment applied. It confirms the work has been done, even while visible growth is still clearing.
How often will your roof need treatment?
A shaded roof beneath trees may need attention sooner than a sunnier roof with good airflow.
- Some roofs we maintain need treatment every year or two.
- Others remain clear for three years or longer.
We can recommend an interval after assessing your roof and its surroundings.
Treatment targets biological growth. It does not repair rust, damaged coatings, loose tiles or leaks, or replace the roof manufacturer’s other maintenance requirements.
Does your roof feed a water tank?
Tell us before the visit. Downpipes feeding drinking-water tanks must be:
- Disconnected before treatment.
- Kept disconnected until at least 40 mm of rain has fallen on the roof.
If you need help disconnecting them, let us know beforehand. Follow the instructions supplied for your job.
Ready to get it sorted?
Send us your property address, any clear photos you have, and your deadline if you are painting or selling.
We will help you choose the right approach for your roof.
