I have a problem with moisture penetrating the breathable membrane of my recently retiled pitched roof. The moisture originates from the nails which secure the battens through the new breathable membrane.
The whole roof [2500 squ ft floor area bungalow with 40 degree pitch] was stripped in Aug 2012 and Klober Permo Forte breathable membrane installed under new Crest pan tiles. Mid November, after 2 days of rain, I noticed moisture seeping through the membrane in several areas and dampening the rafters. At first the Roofer who did the job thought it was due to the battens being wet when fitted and this moisture was coming out through the nail penetrations in the membrane and into the rafters.
However, the moisture has not reduced and recent inspection by the Roofer confirms the mortar used to secure the hip and ridge tiles has not cured properly and is letting water through the joints. The water is then tricking down the outside of the water proof membrane, wetting the battens and penetrating the membrane at the nail penetrations. It seems the water is tracking down past each batten at the securing nails so almost every nail penetration is exposed to a damp batten. In some areas moisture is visible over 30% of the rafters length.
The Roofer now intends to remove and re mortar all the hip and ridge tiles, which is obviously needed, but my concern is whether the Klober membrane should be letting water through at the nail penetrations in the first place? It seems to me that any slight imperfection in hip, ridge or tile sealing either now or as they age, is likely to result in the same problem in the future. Has anyone had a similar experience or can give me some advice?
PS: I’m very satisfied with the overall quality of the work done by the roofer [and it looks good to] and there is no question of him not fixing the problem but I am really concerned about the integrity of the Klober membrane.
The whole roof [2500 squ ft floor area bungalow with 40 degree pitch] was stripped in Aug 2012 and Klober Permo Forte breathable membrane installed under new Crest pan tiles. Mid November, after 2 days of rain, I noticed moisture seeping through the membrane in several areas and dampening the rafters. At first the Roofer who did the job thought it was due to the battens being wet when fitted and this moisture was coming out through the nail penetrations in the membrane and into the rafters.
However, the moisture has not reduced and recent inspection by the Roofer confirms the mortar used to secure the hip and ridge tiles has not cured properly and is letting water through the joints. The water is then tricking down the outside of the water proof membrane, wetting the battens and penetrating the membrane at the nail penetrations. It seems the water is tracking down past each batten at the securing nails so almost every nail penetration is exposed to a damp batten. In some areas moisture is visible over 30% of the rafters length.
The Roofer now intends to remove and re mortar all the hip and ridge tiles, which is obviously needed, but my concern is whether the Klober membrane should be letting water through at the nail penetrations in the first place? It seems to me that any slight imperfection in hip, ridge or tile sealing either now or as they age, is likely to result in the same problem in the future. Has anyone had a similar experience or can give me some advice?
PS: I’m very satisfied with the overall quality of the work done by the roofer [and it looks good to] and there is no question of him not fixing the problem but I am really concerned about the integrity of the Klober membrane.
