I'm renovating an average-sized 1950s semi and having a kitchen extension that will contain a wall-mounted combi boiler to serve 10 radiators & 1 bathroom (bath & shower).
I'm planning to use 22mm pipe for the H&C supplies to the bathroom, and bath taps, but 15mm pipes to the toilet cistern, sink taps and shower mixer.
For the heating circuit I am also intending to use 22mm pipe. Most of the individual radiators will be connected to short branches (the longest is 3m) from the main send & return pipes, and I was going to run those branches with 15mm pipe.
Should this be OK? Also, the heating pipes will need to run from the rear of the house to the front, under the landing floor, and I will have to either drill or notch the floor joists. There are already notches for the old 15mm pipework, and I'm intending to make them a little bigger, but I'm a bit worried that I may be weakening the joists. I was going to put double pipe clips in each notch, screwed to the joist, to hold the two pipes side by side. Is that OK, or do they need additional support? I might use the equivalent flexible plastic pipe (at least where the pipework is out of sight), but that is thicker, and would need the notches to be bigger still. Am I worrying unduly, or should I strengthen the notched joists?
For the avoidance of doubt, I have NO intention of touching the boiler installation or commissioning: I'm just going to put in most of the pipework and hang the radiator panels and fit the valves.
I'm planning to use 22mm pipe for the H&C supplies to the bathroom, and bath taps, but 15mm pipes to the toilet cistern, sink taps and shower mixer.
For the heating circuit I am also intending to use 22mm pipe. Most of the individual radiators will be connected to short branches (the longest is 3m) from the main send & return pipes, and I was going to run those branches with 15mm pipe.
Should this be OK? Also, the heating pipes will need to run from the rear of the house to the front, under the landing floor, and I will have to either drill or notch the floor joists. There are already notches for the old 15mm pipework, and I'm intending to make them a little bigger, but I'm a bit worried that I may be weakening the joists. I was going to put double pipe clips in each notch, screwed to the joist, to hold the two pipes side by side. Is that OK, or do they need additional support? I might use the equivalent flexible plastic pipe (at least where the pipework is out of sight), but that is thicker, and would need the notches to be bigger still. Am I worrying unduly, or should I strengthen the notched joists?
For the avoidance of doubt, I have NO intention of touching the boiler installation or commissioning: I'm just going to put in most of the pipework and hang the radiator panels and fit the valves.
