Any flat roofers on here? need advice please
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  1. #1
    ready salted evilzee28's Avatar
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    Any flat roofers on here? need advice please

    At the moment I have a flat roof on my garage which is 10' wide & next to that is my utility room which is 5 'wide. The flat roof is covered with felt & chippings & covers both garage & utility room as one roof. The joists are 15' long & are supported by the shared wall between garage & utility room as well as being fixed at the ends. The joists are only 4" x2" & are 22" apart.

    I want to take out 10' of the adjoining wall to make my garage wider. Is it better to just put bigger/thicker joists in to cover the 15' span, or do I need to put an RSJ in to support the roof where I've removed the supporting wall? (hope this makes sense). if I can put in bigger joists what sort of size would I need to support the roof?

    Thanks in advance

    cheers...Nige

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    Official RnS Addict stevie.t's Avatar
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    imo you would need an rsj

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    GDL
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    If i have read this correctly. I would allow for 2number 6x4 roof joists (bolted together) at an average centres (approx 4.5) to take the new span. this will run the full length of your garage. whether it is the timber or RSJ they would need to be tied into your walls and cemented in tight to the underside of your roof (not an easy task)

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    RSJ in my opinion, But if your garage wall is a single skin i would reccomend a small pillar against single skin wall, as rsj`s should be supported on a 150mm bearing wall,

    any questions give me a call 07770 722212,

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    Official RnS Addict beach57's Avatar
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    Use engineered timbers they look like rsj the yanks use the all the time ,realy light and eco friendly,my self though i would swith to a pitched roof using trusses.

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    phantom raspberry blower Flamin Black A's Avatar
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    4"x2" flat roof joists spanning 10' is not really big enough anyway, you should be using at least 6"x2" I would put a steel beam where the wall is removed a 152x89x16kg would be suffient if its only supporting the flat roof. A 4" bearing is adequate. You may need a 9" pier depending on where the 10' hole is

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    ready salted evilzee28's Avatar
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    Thanks for the replies guys, appreciated. I want to try & avoid having to put in an RSJ as I'm likely to extend the garage in the future & this would then mean that the RSJ would be too short if I were to put it in to replace the wall. The joists are a bit small as well, so I was hoping to kill two birds with one stone by fitting bigger joists.

    Maybe I should have posted it asking "what size timber joists do I need to support & span a 15' flat roof"??

    I was told by someone that 8" x2" would do it 40 cm apart, any thoughts on that?

    cheers...Nige

  9. #8
    phantom raspberry blower Flamin Black A's Avatar
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    8"x2" flat roof joists are on the limit for spanning 15' I would use 9"x2" at 16" centres

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    Rods 'n' Sods Junkie ROBSTER's Avatar
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    I am in the middle off doin my garage roof 4m wide and about 14m long I fixed a nice bit of 3x3 angle iron attached to the main wall and used 6x3 timbers to go across
    and 18mm ply on top . Might not be the best way but as I do a lot of temp work for a living and found this is quick cheap and works just got to finish it of know its hard when you have to work around you motor as well . Hope this will give you some sort of idear good luck....

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    Official RnS Addict Mark H's Avatar
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    What's the differance in loading on the timbers between a flat and pitched roof?
    The reason I ask is that I'm converting an old building into my new garage.The timbers which will form the attic floor are 6x2's and span 17ft 6in.It's a fully slated pitched roof and has been up since 1860.I would have thought 6x2's would have been big enough for Nige's flat roof?

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