Is it possible to coat as corrugated asbestos roof with a waterproof sealant. Cannot afford the £1200 cost of replacing the roof and then the cost of boarding and insulating the garage on top of that.
Assuming the asbestos corrugated roof is clean, dry, sound and prepared as detailed in the technical data sheet we can recommend Eagle Bitumen Primer followed by Eagle DoubleCoat Pro-Reflect Liquid Waterproofing.