timbers

Hi Everyone, Recently when going into my loft to change the bathroom fan, I noticed that there was a huge amount of damp and black mould on around half of the timbers. I also noticed a smaller spot of what I think is white mould on one rafter and the felt around it. After investigating I found...

As per title really - is it ok to hang joists on a joist which is already supported at either end on joist hangers? I'm looking to get rid of the ugly timbers which are below ceiling level under a flat roof which is part of an extension from many years ago (1980's). It's a bungalow and the...