The loft door should be shut!!!! What you are doing is allowing warm mosit air into a cold roof space where it condenses on the roofing felt and timbers and drops off.
Do not discount the possiblity of a leaking roof or a plumbing leak.
As you reported this problem to your builder within two years and they have failed to fix it, you are still covered by the NHBC warranty. Write to the NHBC and make a claim and enclose all copies of letters and e mails to your builder regarding this problem.
For everyone else's benefit who was your builder?



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