We are undergoing a house renovation and planning to have overlay UFH fitted with a screed. We will also be having an ASHP and internal wall insulation fitted. It is an unusual property, it was built on ground that slopes from front to back and side to side. The hallway is at ground floor level but as we reach the lounge and dining room we are at first floor level without having gone up any stairs. We are able to access almost all of the joists and floorboards from 4 cellars below (these will eventually be converted into living areas). Our concern is that the floorboards will not be able to take the weight of the UFH and screed which will weigh approx 39kg/M2. (This is without a finished floor covering). We are hoping to have a screeded system as it will be most compatible with an ASHP. How would a Structural Engineer calculate if our existing floorboards are adequate? Would she /he need to do a site visit?
(We have used a Structural Engineer when we had plans drawn some time ago but we are reluctant to go back to him as he didn't visit the property until we insisted, and that could be a separate thread.)
Any advice appreciated. Many Thanks