Most frequent questions and answers
Fibre-cement sheeting, concrete roof tiles, clay roof tiles, Chromadek® sheeting and flat roofs. We do not recommend high-pressure cleaning slate roofs.
Most roofs are okay to pressure clean every few years. We do not recommend repeated high-pressure cleaning of concrete roof tiles as the smooth surfaces gradually wears away and they become very rough. This allows dirt and debris to adhere to them which, in turn, speeds up the build-up of moss/algae. We recommend painting these tiles with a premium quality roof paint which keeps them looking new for many years to come.
This will depend on the amount of sun the roof gets, annual rainfall, overhanging trees and proximity to industrial areas. This will also depend on if the roof substrate was painted. A newly cleaned and painted roof should stay looking good for at least 6-8 years.
A powerful high-pressure cleaner only requires about 500 litres of water per hour, at a pressure of around 160 bar. In comparison about 1500-2000 litres of water per hour flows through a normal hose.
Access, pitch and type of substrate all affect the cost. We are able to give a ball park figure via satellite images. Should you still be interested we will then need to make a site visit to give a final price.
Painted walls: We usually only high-pressure clean these when we will be painting, as loose, flaking paint will be removed during the process.
Face brick walls: These can be safely high-pressure cleaned.
Paving: It is advisable to lower the pressure considerably on the machine when cleaning paving. There is a chance of damaging the grouting between the pavers. However, it is still a far cheaper solution than having to install new paving.
We use a low-pressure flow on paintwork to avoid any damage. However, it is not always advisable to pressure clean if your walls haven’t been painted in a while, as this could still result in paint flaking off even with a lower pressure.