Hi, i wonder if someone could help me with my leaky roof,the house is only six years old but a portion of tile has slipped and damaged the felt inside,This has caused a leak which has stained the ceiling below,i have removed the offending piece of tile by cutting the felt,i have tried to insert a piece of felt temorarily behind the existing felt, is there a way of doing a permanent repair from inside as looking from the outside the roof looks perfectly good,the offending piece of tile seems to have been rubbish left on the roof before tiling, many thanks.