Expanded polysterine filled door

Hello another quick question - this one on doors. Solid core wood is extremely expensive (in a country that burns downs most of its forests) so I have been proposed some doors (not cheap either) that are filled with expanded polysterine - about 8cm thick and covered with two thin aluminium sheets. Apparently it seals below as well - like a patio type door. Any idea how good the insluation results of this would be? Thank you

Not very good; if you can lift the door without a helper, it's not worth putting in. You want MASS in order to stop sound. You may want to check on price/availability for sheet lead; you can laminate that to both sides of a standard (NOT hollow, preferably) door for one way to increase mass. What other HEAVY building materials are available to you reasonably priced? Maybe we can figure something out... Steve

Hi Steve I 'll look into it and come back to you

Hey Steve do you think that compared to something like the door described above, would a patio-type double glazed (not sliding) door be a better solution?

If, by "double glazed", you mean a single door with double glass, then it won't be all that great either; that would give you a m-a-m construction, but it would be about like putting two layers of 10mm drywall about 15mm apart - not very good LF isolation, and not too bad for mid-frequencies. If, by "double glazed", you instead mean TWO single doors, each with single glass, placed in the same frame several inches (like 150mm or more) apart, then if they are both sealed well you should get fairly good results due to the wider air gap... Steve