How to clean a fibreglass flat roof
Firstly, any loose debris such as leaves are best swept from the roof using a soft brush.
You can then use any of the following methods to wash the surface, depending on the access and equipment available:
- Mop and bucket
- Soft brush and warm soapy water
- Pressure washer (non steam)
How often should a GRP roof be cleaned?
In most cases, a yearly clean is sufficient, and a good time to do it is early spring, to clear off the debris from the previous autumn / winter.
In some cases, where debris builds up due to the proximity of trees or where moss grows on a north facing roof, you may need to clean more often.
Cleaning off mold & mildew
If your GRP flat roof is suffering from mold or mildew, the following process is advised:
- mix up a solution of 1 part bleach to 4 parts water
- apply to the fibreglass surface
- let it sit for 15 minutes.
- rinse off with fresh water.
Cleaning moss and algae
Stubborn deposits of moss or algae that can't be shifted using the above methods, can be cleaned using either a chlorine mix or a mixture of sodium hydroxide.
Environmentally friendly cleaning
One option to clean your GRP roof that is environmentally friendly is white vinegar. This can be purchased in bulk 5 litre containers and mixed with water.
Roof Repairs
If you spot any areas that need repair, purchase our GRP fibreglass flat roof repair kit to make re-instatement easy.
