Concrete
Maintenance and Cleaning
| Types | Maintenance / Cleaning | Cleaning Frequency |
| Single lap concrete interlocking tile classified as group B product as to BS 473/ BS 550 (or BS EN 490) or ASTM C 1492-01 of body thickness not less than 9.5mm and at interlocking portion not less than 6.3mm | Inspection:
A visual inspection on a regular basis to determine if any damage to the roofing components. Look for cracked or missing tiles and shingles and other defects. Shingles that are curled, cracked or missing their protective coating of granules will need to be replaced, and that probably means replacing all of them. Cracked tiles can be replaced individually by a professional. A leaking flat roof may just need new flashing, or it could require a complete replacement. Replace damaged tile as required. Colour may fade.Recoating may be needed. Periodic cleaning by water jet pressure to remove stains and dirts However, water pressure jet may not safe for some type of shingles, as it can cause damage and causing asphalt granules to be removed. Alternatively, chemical solution with no chlorine can be used. |
Once a year |
| Double lap concrete plain tiles classified as group A products as to BS 473/ BS 550 (or BS EN 490) or ASTM C 1492-01 of thickness not less than 9.5mm at any cross section. Either smooth or granular finish. | ||
| Double or single lap concrete imitation slate or stone slate manufactured and tested in accordance with BS 473/ BS 550 (or BS EN 490) or ASTM C 1492-01 of thickness not less than 9.5mm at any cross section. Manufactured by high pressure extrusion and compaction process. Slates to be tightly fixed to battens, stone slates to be hung on battens. | ||
| Bitumen based reinforced sarking felt not manufactured to BS 747 Type 1F |