we have mapped out the various pipework, cables and other conduits that has to travel around under the floorboards including a fresh air channel to connect all the Earth Tubes together and also a hot air channel to warm up the Garden and Garage Rooms themselves. We are slicing up 18mm OSB sheets into 132mm high vertical supports with a shallow groove to take short cross support to form a grid matrix spacing of 600mm in each direction. The long strips will be tongue and grooved to join them all together in one long pieces. The floorboards will be the usual 18mm OSB sheets, also tongue and grooved to form one solid integrated layer with removable “doors” to allow access to the Earth Tubes and the Rain Tank manhole.
Garden room floor framing
Garden room floor framing