Hi we want to waterproof an asbestos garage roof with over lap sheets it’s 18 metre square what’s the best and how much of each this roof has never been touched since was built
Assuming the asbestos sheets are clean, dry, sound and prepared as detailed in the Technical Data Sheet we can recommend Britannia Aquashield Primer, followed by Britannia Aquashield High Build.
You will require 6ltr of Aquashield Primer and approximately 36kg of Aquashield High Build for the 18m².