Loft conversion underslung joists

8 Mar 2020
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United Kingdom
Evening chaps,

I've just started to DIY a loft conversion of a Victorian terraced property.

The existing ceiling joists run from front to back of the property. I plan to undersling new floor joists from a steel beam so that they're 25mm above the existing ceiling. These have been specified by a SE.

One thing I can't get my head around. On one party wall there is a chimney, but the existing ceiling joists run right next to it, so if I wanted to undersling new floor joists I would only be able to undersling them so that they run adjacent to the non-chimney side of the existing ceiling joists. This strikes me as losing quite a bit of potential room space (i.e. 30cm or so). Is there a way round this that people in the know are aware of? E.g. would you ever replace the ceiling joists with new?



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