Slate

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Maintenance and Cleaning

Types Maintenance / Cleaning Cleaning Frequency
Natural slate; size maximum of 610 x 335; to BS 680 Part 2 or ASTM C 406-00 with test certificate for specific batch delivered to site, including test for iron pyrites. Inspection:

A visual inspection on a regular basis to determine if only damage to the roofing components.

Replace damaged tile as required.

Fading and weathering of the surfaces is to be expected

Cleaning:

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
Natural slate sizes up to 610 x 335. Slates comply with requirement of BS 680 Part 2 or ASTM C 406-00 with special reference to achieving water absorption, wetting and drying and the sulphuric acir immersion tests criteria.