This roof was fully stripped and re-felted, the existing garage tiles were removed to allow access to the faulty covering. The roof was then stripped back to the original timber substrate which was replaced where necessary with ply wood decking.Subsequently, a new optimal-performance 3-layer built-up felt covering. The new felt system included new drips, upstands and welts according to necessity, outlets and lead saddles were fitted to drain water from this obscured felt roof.In conclusion, all of the apending tiled sections were remedied re-using the existing tiles and re-balancing the deficient tiles to match.