Afternoon, First post here so please go easy.. I'm fitting a kithen (DIYer) and wondering if it is ok to clip 15mm copper pipe to the hardboard backing under the kitchen sink. I'd like to bring the pipes up through the bottom of the unit and have a nice layout on the backing board to serve H+C taps and the dishwasher. The backing board seems a bit flimsy but what other options are there? Cheers.