At the beginning of November I noticed a mark on the ceiling. Suspecting a leak, I got a roofer in to trace the source. He confirmed that the valley was defective and would need replacing. As the house was under 10 years old, I lodged a claim with the NHBC. The inspector from the NHBC said the mark was due to condensation.
How do I know which diagnosis is correct, please?
How do I know which diagnosis is correct, please?