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Thanks Kenny, but I have already gone down the sistering route due to the room size and the differences in height. Can anyone offer advice on the subfloor? OSB2, Chipboard or Ply? Thanks

OK thanks, will bear that in mind. I'm going to try and put cross pieces/noggins perpendicular to the sisters/joists too where height allows to give it more rigidity and to give more fixing points. Is OSB2 secured with screws the current preference for a subfloor? Here in France it is the...

Thanks for all the advice. Have gone with 38x150mm pieces and ordered a load of 150mm bolts. Catlad, that was also suggested by a local but height would have been an issue Cheers

Hi, how did you then attach whatever floor you laid on top? Surely 18mm is too narrow to then screw in to or did you then pack out the joists and screw through that into the joists?

The existing joists are 8cm wide so adding 150x38mm beams is going to make them 118m wide so surely I will need 130mm+ bolts?

Thanks for all the replies and confirming the correct approach. As sizes are slightly different here in France, could I get away with 38mm widths as opposed to 5cm (2in)? Also, in terms of the bolts, are these what I need...

Hi, yes just realised I forgot that crucial bit of info. From the highest corner to the lowest (which is diagonally across) the fall is about 6cm although at a couple of points in between, it is nearer 8cm

Hi, I've been through various threads on the subject on here but I just wanted to gather opinions before I commit to a solution. I am renovating an old house in France and am in the process of converting the attic space into bedrooms. The joists are in good condition and seemingly adequately...

Thanks for all the replies and sorry for the delay in responding. I'm glad to hear the consensus is that a 5m beam will support the back of the house without a central column. The walls are 50cm stone but I can't guarantee that they aren't rubble filled so I did wonder about their ability to...

Hi, I'd really appreciate a bit of advice on the feasibility of our project and any approximate cost if possible. We are looking to install 23m2 (6.6x3.5m) mainly glass single storey extension on the back of our French stone farmhouse as per the pics if I managed to include them correctly...