Over the last couple of days, we installed water pipes inside the roof of the Great Room, drilling 15mm holes through each rafters, located about a metre up the slope from the walls and threading the 10mm diameter microbore plastic pipes. We have two separate runs both start downstairs underneath the floor at the end of the Hall as it enters into the Great Room. One pipe goes off towards the back of the building, inside the wall that separates Bedroom One and the Great Room and then goes up until it meets the roof rafters where it is threaded through the holes in each rafter going half way around the Great Room. The other pipe goes off in the opposite direction, through the Kitchen / Great Room wall and then goes up to meet the roof rafters and also threaded through the roof rafters as well. We have decided to locate eleven spray nozzles on the first run of water pipe and a further eight nozzles on the second run. 
Nozzles all connected (1)
Nozzles all connected (2)
Nozzles all connected (3)
Nozzles all connected (4)
Each location then has a T-junction adapter and short lengths of 10mm copper pipe that has an quarter-inch female adapter on the end so that we can screw in a spray nozzles at the final stage after we have decorated the ceiling surfaces etc.
There will be two more nozzles located right up to the under side of the Skylight so we can spray a mist of water directly over the Gallery as well. These will be installed later on when we have built the bottom part of the Skylight ceiling modules. We have also discovered another high pressure pump, this time it is a battery powered pistol shaped water pressure washer kit but it turned out to offer even higher pressure and faster flow rates. This handy neat little machine can generate over two megapascals of water pressure (this is about 20 bars or 300psi!) and this would be ideal to drive many more nozzles like we have here in the Great Room plus also produce a finer spray of water droplets and reach even further around the room. Connecting to it will be a bit convoluted but overall a very neat piece of kit!
A Low nozzles
A High nozzle
There will be two more nozzles located right up to the under side of the Skylight so we can spray a mist of water directly over the Gallery as well. These will be installed later on when we have built the bottom part of the Skylight ceiling modules. We have also discovered another high pressure pump, this time it is a battery powered pistol shaped water pressure washer kit but it turned out to offer even higher pressure and faster flow rates. This handy neat little machine can generate over two megapascals of water pressure (this is about 20 bars or 300psi!) and this would be ideal to drive many more nozzles like we have here in the Great Room plus also produce a finer spray of water droplets and reach even further around the room. Connecting to it will be a bit convoluted but overall a very neat piece of kit!
One of the final things that will do, is to perform a pressure check with compressed air first and then with water, and make sure all our joints and nozzles are good and tight. Once we are happy with that, we then can proceed to finishing off filling in the roof rafters with glass wool and sealing the roof with vapour barrier and 11mm OSB wooden sheets etc.