Chris Pearson:

davezawadi (David Stone):

Ask the Building Inspector about this inter-floor insulation. I have never seen it. Keep asking until he shows you the regulation which requires it.

David, it is all in Part E. Although it seems rather onanistic, there are good reasons for it. For example, at one stage Daughter and her beau had a semi-basement flat in Town. Unfortunately, every little tinkle, splash, and flush from the loo in the landlady's flat above was audible. ?


I note what you say above about acoustic insulation. I have not yet found a value for its U value, but presumably it is a little less than that of thermal insulation. In the meantime, provided that cables are kept to the edges, I think that IM 100# is the best that we can do.

Thermal conductivity values are very similar - looking at rockwool - 100mm thermal is 0.044 vs acoustic 0.038 W/mK - and it is on this basis that I am applying the rules for installation in or adjacent to thermal insulation. Im going to run the design past the person issuing the electrical installation certificate before commencing work, but wanted to get it right before submitting it and also for my own piece of mind. I like to work through problems logically and better my understanding through doing so. Thank you for your time in helping with my understanding - I am grateful to all that have contributed to this thread. 

Chris Pearson:

davezawadi (David Stone):

Ask the Building Inspector about this inter-floor insulation. I have never seen it. Keep asking until he shows you the regulation which requires it.

David, it is all in Part E. Although it seems rather onanistic, there are good reasons for it. For example, at one stage Daughter and her beau had a semi-basement flat in Town. Unfortunately, every little tinkle, splash, and flush from the loo in the landlady's flat above was audible. ?


I note what you say above about acoustic insulation. I have not yet found a value for its U value, but presumably it is a little less than that of thermal insulation. In the meantime, provided that cables are kept to the edges, I think that IM 100# is the best that we can do.

Thermal conductivity values are very similar - looking at rockwool - 100mm thermal is 0.044 vs acoustic 0.038 W/mK - and it is on this basis that I am applying the rules for installation in or adjacent to thermal insulation. Im going to run the design past the person issuing the electrical installation certificate before commencing work, but wanted to get it right before submitting it and also for my own piece of mind. I like to work through problems logically and better my understanding through doing so. Thank you for your time in helping with my understanding - I am grateful to all that have contributed to this thread.