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Not sure whether 'active slab' is being used in the correct sense here - what I want to do essentially is to redistribute heat from my solar gain areas in the south of my house to the northern cooler end with minimal sun. So all my UFH pipework is in and I'm hoping to get hold of a contractor to pour the slab in the next few weeks (If I can get hold of someone I have faith in!). Prior to the slab being poured, what do I need to do before? Obviously I need to pressure test all of the pipework and ensure there is no major drop, leaks etc. Anything else I need to do in the actual floor area before it gets covered? I've read with interest Jeremy's Active slab option and also found TerryE's blog entry of use: The figures are a bit over my head at this stage, but all I want to do right now is to have all gadgets and gizmo's in place before the concrete sets! I have a 12 port manifold serving the entire ground floor which has a makeup of: · Concrete (to be done!) · UFH tied to mesh (150mm centres) · Elevated mesh · DPM/Radon barrier (under top layer of insulation) · circa 300mm EPS insulation · Compacted Hardcore At this stage I will be fitting a gas boiler (ASHP may be an option in future years). I have a large southern glass facade which is fairly well shaded by the trees in summer, but in winter with less foliage and a lower sun, the slab in the lounge/diner and kitchen should pick up some decent solar gain that I am hoping to re-distribute to colder areas of the house. I will have EWI installed also in addition to the PVs and planned MHVR). 1) Where do I place the floor sensors? I was thinking to have one in the lounge/diner in a spot where I know the sun's going to hit or somewhere not directly in the sun and away from a pipe? I'll also place one in one of the bedrooms that will never see any sun (along Jeremy's method: "deliberately placed around 150mm to 200mm away from the nearest UFH pipe on the "cold" side of the house (the bit that never sees solar gain)." Is it worth placing a couple of spare sensors in the slab in case of malfunctions in coming years? 2) What do I need to do on the manifold side with regards to plumbing. Obviously I can do this after the concrete is poured but if I can save from having to do major changes later on? TIA Back to a bit more cable tying....