I'm looking at adding extractors to the ceiling in 2 bathrooms, directly above them in the loft there is "boxing" which runs the full length of the house on both sides along the eaves. I will probably have to cut into the boxing but wondered what it is and what I will find inside of it? Much of the loft has been boarded out but this seems original, any ideas?
View media item 71386
Thanks
View media item 71386
Thanks