Mosses, lichens and algae cause several problems; they can grow on virtually any roofing material their root systems can bore into solid granite up to 12mm! So once established on tiles, they allow the passage of water into the substrate which gives rise to frost attack and shaling of tiles as well as excreting acids, such as oxalic, which attacks the alkalinity of materials used, further weakening the tiles and bleaching the colour out. Heavy moss contamination when soaked by rain will considerably increase the weight load on a roof. Once established these colonies lead to the rapid deterioration and breakdown of roofing materials eventually necessitating costly replacement.

M.G.C. has specialised for over 36 years in the study of microbial attack on buildings. Based on this experience M.G.C. developed a range of systems and treatments to eliminate all types of moss, lichen and algae infections on all varieties of roofs and roofing materials. These treatments not only eradicate the growths but protect the roofs from reinfection.



A simple, two-stage treatment for roofs infected with mosses, lichens and algae.

LICHENITE: A colourless easily applied solution applied by brush or low-pressure spray to infected areas. It is left on the surface for 72 hours to allow the root structures within the substrate to be killed off. LICHENITE is approved under The Control of Pesticides Regulations 1986 (as amended) for use as directed. H.S.E. No. 7497.

HALOSEAL: A clear, colourless solution of complex stearates which has the ability to protect surfaces against water penetration and prevent the regrowth of mosses, lichens and algae for up to ten years. It can be applied to asbestos, clay and concrete tiles, slates etc. HALOSEAL penetrates into the tiles and protects against further deterioration and does not result in shiny tiles when dry. HALOSEAL is moisture vapour permeable.


ROOFCOAT FR10 is a one-component polymeric composition for leaking roofs, gutters and similar structures for application in circumstances unsuitable for other coatings.

ROOFCOAT FR10 contains no bituminous products and can easily be applied providing an instant remedy for leaks in all weather conditions thus avoiding Roofing Contractors’ nightmare of a “wash off’.

In emergency situations, ROOFCOAT FR10 can be applied successfully under water and curing will still take place whether it is applied thickly or thinly.

It will adhere to any surface, bitumens, roofing felt, metal, plastic, brick, concrete, tile, slate, timber, asbestos, etc. and, in conjunction with M.G.C. reinforcing membrane, cracks, splits and defective joints can easily be repaired.

ROOFCOAT FR10 is an ideal product for roof repairs when adverse weather conditions prevail and can even be applied in the pouring rain.

One coat will last up to 10 years.