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Loft Conversion

Extending a room horizontally into roof space

Anonymous user 28/02/2024 - 2.39 PM

Hi, Thanks for the reply. The depth of the existing floor joists is 18cm and the width is 8cm. There is a strip of timber about 4cm by 4cm which runs along the side of the last floor joist. It is attached to the floor joist at the joists bottom edge. The ceiling joists look as if they are notched so that they rest on this strip of wood. The ceiling joists then run at rightangles to the floor joist to the top of the back wall. The ceiling joists have a span of about 200cm. You're suggestion sounds good. I am just concerned that the blobs of plaster poking through the laths of the ceiling will prevent a joist of similar depth being used. Also does this method put any unreasonable extra stresses on the structure of the house?

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2 Answers

DJ Building Design

Rating: 4.5 out of 5

Tipton

Hi It would be helpful to know how the ceiling joists are fixed to your last floor joist , and at what height. The depth of the floor joists would be useful as well. From my understanding of your prooblem I would suggest that you could strengthen the last floor joist by bolting another one to the side of it or even a flitch plate ( a steel plate). You could then hang new floor joists to it and set them between the existing ceiling joists so that the top edge is flush with the top of your existing floor joists.thiswould save any damage to the ceiling and is the method used i most loft conversions to preserve headroom. Hope this is helpful For a 200cm span (2 metres) you can use 50 mm x 120mm C16 grade joists. Sorry about the change of units but I tend to think in millimetres, metres and imperial measurements. Just to be clear,the depth of your existing floor joists is 18cm(180mm), the width at 8 cm seems unusually large, I would have expected 5cm. The method I have described is common for forming openings for stair etc. The only thing to watch is that the last floor joist which is being strengthened doesn't have an opening directly below in the walls on which it bears.

Answered18 September 2011

Zibi Building Services - Property Service from A to Z

Rating: 5 out of 5

West Wickham

FIND AS ON SIDE AND SEND MY PICTURES I HAVE BETTER SOLUTION FOR YOU ZIBI BUILDING SERVICES I HOPE WE CAN HELP WITH THIS AND SOME OTHER PROJECT THAN S

Answered13 November 2011