Painting your RoofIf the roof tile is new then it’s a simple task of sealing and painting the roof. Roof tiles are quite porous and they absorb a lot of paint, this is why we first seal the tile with Paintcors Acryseal diluted 1:1 with water, it can be applied with a regular roller or block brush, allow the sealer to dry. Once sealed, the paint does not get absorbed into the tile which means greater film thickness of the paint is achieved. Film thickness of a paint system is very important on roof specifically because of the sun. UV rays will destroy approximately 6 micron of the paints film thickness every year, this is why it’s important to apply 2 good coats of Paintcors Ruvacryl roof paint on an already sealed tile allowing drying time between coats.
If the roof has been painted then the old paint has certainly been worn down by the sun, this is observed by rubbing your finger on the paint system, you will probably find you have a type of chalk in the colour of the paint left behind on your finger as seen in the picture, this is known as “chalking”. This chalk and any dirt must be thoroughly washed off the roof with a broom and water. Then remove any lose or flaking paint from the roof if there is any. Once again we will need to apply a coat of Paintcors Acryseal diluted 1:1 with water to the surface, this is done to ensure that any chalk left on the old paint system is soundly bound up so the new paint doesn’t peel. Allow the sealer to dry for about 2 hours depending on the temperature. Then apply 2 coats of Paintcors Ruvacryl allowing drying time between coats.
If the roof is unpainted and old, then there is a big possibility it has green or black algae on it. This algae must be poisoned and removed before painting. It is also sometimes seen on previously painted roofs that have peeled. Use Paintcors Ushevu diluted 1:19L of water to make 20 litres of biocidal wash. Using a broom scrum the mixture onto the roof thoroughly. Leave it on over knight and then wash it off with fresh water the following morning. If you still see green algae then repeat the procedure. Once the roof is dry you can then seal and paint as mentioned above.