Dazzer

Hi everyone. My extention kicks off next week and trying to work out the best way of incorporating a wet ufh system into the new and also the old. We will be knocking our existing kitchen diner through into the new extension to increase the size. The existing is a concrete floor built in 1985 and not sure if there would be insulation underneath or not. I'm happy running in a loop for the extension ontop of the insulation prior to screening, but would like to have some ideas about how to tackle the existing so that it will hopefully feel similar in heat to the new. I have seen a floor chasing machine that cuts grooves in the floor specifically for ufh pipes so may look to do this. I don't really want to go down the route of using the surface insulation boards if I can help it, It will raise the floor height to much from when we enter the hallway and also the idea of the pipes being so close to the floor tiles I'd be concerned about feeling colder patches. Any one had a similar issue before and can give some input?

Hi. Had the drawings back from the structural engineer for extension which requires the steel goal posts setup. Where the columns have to sit on the existing footings that will require digging down and breaking through the damp course sheet. When filling the holes back how do you maintain the damp proofing?