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Hi, I had a Megaflow unvented cylinder fitted about 3 years ago. I have a problem regarding the non return valve in this system in that whenever hot or cold water is drawn off, the nrv slams shut with a loud thump like a hammer blow on the pipework. I have tried reducing the cold inlet feed...

I am contemplating 'topping up' the insulation in my loft by using a proprietary product which consists of fibre glass enclosed in polythene to form 'pads' of various thicknesses. The 'pads' are designed to be laid on top of existing insulation. My concern is, by using these, I would be...