The floor is in the kitchen and very uneven. I considered putting down a self levelling compound before tiling, but this would make it significantly higher than the dining room which has a wooden floor.
Also, I'd like to sink the gas supply properly into the floor. Currently it runs under the wooden floor in the dining room into the kitchen at an angle bringing it up out of the floor, then it sinks down into the concrete again only to re-emerge about 6inches along.
your gas pipe must be deep enough to avoid any for seeable damage to the floor. It must be wrapped in denzo tape or gaffa tape or anything to stop corrosion. It must be clearly labelled using gas ID tape and once the concrete has been laid, the concrete must be marked GAS and a small chalk line drawn in the direction following the gas supply. Also the pipe must be laid in a bed of sand. Well thats what we do i cant speak for anyone else, but if you want a first class job follow that and you will be fine, just make sure you dont do any gas work as it will effect your house insurance even if its been installed ok. Also pipe doesn't have to be too deep only a few inches but recommended 4 inches but thats quite hard to do if its tuff concrete, RENT A BREAKER OR kango! and check for pipes before you dig!
My company is taking work for june now and i assume most gas engineers are busy so start calling..
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