Firstly, Im not a plumber but like to tackle anything in my own house. I want to plumb in a USA type fridge to the cold water supply in the kitchen. The floor is tiled and i dont want to lift them. The best route is outside through the kitchen wall under the sink.. under the decking fir 10ft...then back into the house where the fridge is. The pipes would be almost entirely hidden under the decking. I was going to use 15mm plastic pipe with insulation, instead of copper and compression fittings instead of plastic. Any issues with this? Any advice welcome! Cheers!