I'm running a GCH system in it. I'm going to use the pipe securing clips with nails every 3 or 4 joists when running over. How about running alongside joists? Do I need to support the pipe or can it just rest on the plasterbaord of the downstairs ceiling?
I think you might need to clip more than once every 3 or 4 joists! I recently did some work under the suspended ground floor of a house I semi-renovated a couple of years back, part of that work being the installation of central heating. I clipped the (plastic barrier) pipework at every single joist, and it has still sagged a little. If there's anything on show then I would suggest using copper.
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