Guest Pete Posted January 19 Report Share Posted January 19 We have an attached annex converted 10 years ago which is now let out as a single let. It's ground floor, but part of our habitable accomodation is above, with standard plasterboard ceilings. Can we base on recommendations here having a grade D and ld2 be acceptable? Many thanks housing – fire safety | cieh https://www.cieh.org/media/1244/guidance-on-fire-safety-provisions-for-certain-types-of-existing-housing.pdf P47 Fire separation (see paragraph 19) 30 minutes fire resistance between flats throughout is the ideal, but on risk assessment there may be no requirement for additional fire-resisting separation between units providing walls and floors are of sound, traditional construction and additional compensatory detection is fitted. Quote Link to comment Share on other sites More sharing options...
AnthonyB Posted January 22 Report Share Posted January 22 Possibly. Depending on the conversion work & materials used you may have 30 mins FR already. Quote Link to comment Share on other sites More sharing options...
Guest Guest Pete Posted January 24 Report Share Posted January 24 Much appreciated Anthony! Quote Link to comment Share on other sites More sharing options...
Guest Guest Pete Posted January 24 Report Share Posted January 24 Just out of interest, would 12.5mm plasterboard (standard) and 3mm skim achieve 30mins? If not, is it worth considering intumescent paints? Lastly each room only has one pendant fitting, so this seems to be much less of a fire risk compared to if all were non fire rated downlighters. Not sure if light fitting should be considered in the assessment. Many thanks again! Quote Link to comment Share on other sites More sharing options...
AnthonyB Posted January 29 Report Share Posted January 29 Rough guide for existing premises from current guidance: Notional 30 minutes fire resistance – typically timber floors with lath and plaster ceilings. Full 30 minutes fire resistance – typically timber floors with plasterboard ceilings Guidance for uprating timber floors accepted a 12.5mm plasterboard (or 6mm of certain calcium silicate board such as Promat Masterboard) with a plaster skim to the underside of the joists, although different types of board products require different thicknesses and need checking with a manufacturer Quote Link to comment Share on other sites More sharing options...
Guest Pete Posted January 30 Report Share Posted January 30 HI Again, Many thanks for your reply. Just so im not misinterpreting. Full 30 minutes fire resistance – typically timber floors with plasterboard ceilings This refers to existing ceiling being 30min fire resisting with a standard 12.5mm plasterboard (not fireline or other). Many thanks Quote Link to comment Share on other sites More sharing options...
AnthonyB Posted January 31 Report Share Posted January 31 Based on the sources I used, yes. Quote Link to comment Share on other sites More sharing options...
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