Have been in loft today to get down,,wait for it,,"The Xmas Decorations" after days of nagging from the wife..When in loft i noticed that a row of insulation,about 3ft long had water sitting on it. Loft is underfelted and directly above damp patch appeared to be dry,but the joist running up to ridge was very dark and damp all along edge..does this mean i have a loose tile or ridges need filling...