Practical guide
Roof Tile Paint, Waterproofing and Repairs
Distinguish roof coating, ridge repair, underlay and leak repairs before selecting products for a tiled roof.
Updated 16 October 2026
Reviewed by the 99Tools team. Editorial and corrections policy.
Find the defect before choosing a coating
A stained or faded surface is different from a leak caused by broken tiles, displaced units, faulty flashing or inadequate laps. Have the roof condition and water entry assessed before buying paint or sealant. A surface coating does not automatically correct the roof’s underlying weatherproofing details or restore damaged support.
Roof tile paint and colours
Use a coating system confirmed for the actual tile material, existing finish and condition. Follow the current product instructions for cleaning, adhesion checks, primers, drying and recoating. Concrete, clay and coated tiles may need different treatment. A colour chart does not establish compatibility, and this guide does not prescribe a universal paint or spreading rate.
Sealant, membrane and underlay
A liquid waterproofing coating with reinforcing mesh is not the same product as an undertile membrane beneath the roof covering. Each has a specified use and installation method. Check compatibility and the source of the defect rather than assuming any roof waterproofing product belongs over every tile or joint. Existing drainage and ventilation details still need to function.
Ridge repairs and named products
Ridges, hips and their fixing or bedding systems need the matching repair approach. For a product such as Flash Harry Roof Tile and Ridge Repair, use the current manufacturer instructions for its intended substrates and preparation. A product name alone does not prove it solves every ridge defect. The quantity calculator counts only the accessory data you enter.
Replacing a damaged tile
Identify the matching profile, finish and fixing arrangement and have access and nearby damage assessed. Avoid turning a material quantity estimate into a universal roof-access or replacement method. Work at height and roof condition need proper planning by a competent contractor. Check the surrounding covering and flashing instead of treating one visible crack as the whole diagnosis.
Price the scope separately
Ask for a quote that distinguishes replacement tiles, ridge repairs, preparation, coatings, compatible membranes, labour and access. Enter only the relevant quoted materials as allowances if using the calculator’s material budget. Paint or sealant litres require the selected product’s stated coverage and coat system. There is no automatic waterproofing or paint quantity hidden in the tile count.
Budgeting for roof painting and cleaning
Price the agreed condition assessment, repairs, preparation, compatible coating system, access, protection and waste handling. Compare coat count and product coverage as well as the headline R/m². A pressure-washing quote is not proof that the method suits the covering; do not disturb suspected asbestos without specialist assessment. Use the Roof Cost Calculator for entered maintenance quotes, taking care to use the treated roof area and avoid repeating preparation charges already included in a package.
Use the related calculators
Apply the explanation above with your own figures. Open a calculator below, check every input and review the result assumptions before making a decision.
Frequently asked questions
How many roof tiles do I need per m²?
Use installed coverage for the exact product and laying conditions. There is no universal rate for concrete, clay, slate and tile-profile steel sheets.
How many roof tiles are in a pallet?
Pack quantities vary by product and supplier. Enter the actual units per pack or pallet from your selected quote.
Can I calculate a hip roof?
Yes, using its measured total sloping field area. Enter hip/ridge accessories separately; the tool does not derive complex roof geometry or hip lengths from one rectangle.
Is this a Cashbuild or Marley roof tile calculator?
No. 99Tools is independent. You can enter the exact product coverage, pack count and quote from the chosen supplier or manufacturer.
How much does one roof tile cost?
Use a current quote for the exact profile, finish and location. The calculator estimates purchased material cost from your inputs rather than loading live prices.
Does it calculate paint, waterproofing or solar mounting?
No. Those need their own product coverage, compatible systems and roof assessment. Optional quoted material allowances do not establish installation suitability.
Can I use a UK or Australian product rate?
Only if it is confirmed for the exact product and installation being purchased. This page focuses on South Africa and does not assume overseas rates match local items.