Thanks for the advice and I've decided to ask the manufacturers to come and inspect the membrane and its installation.
Latest update [Sept 2012
The Roofing Contractor has inspected the installation and says the ridge and hip tiles have not bedded correctly either due to incorrect...
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...