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I know I know im in the class of "do it right do it once"! Which is exactlywhy im a bit paranoid about trying to go one step beyond and causing more probs etc. :| At least im more assured of which way im going, with which Im grateful to you FMT! I can now progress with getying the...

Thanks FMT for this advise its well appreciiated! Yep osb over the top to leading edge of plate, that will be good for affixing any battening for grp drip trim adjustments. Im thinking of adding some butyl self healing tape along area run of joists above or maybe below vapour barrier so as...

Hi FMT. lol contact made! Yes im in a wee bit of a hurry need to get my grp roof done before winter really sets in. im feeling the way to go is to butt the 130mm celotex to the inside of the external brick skin so as the top of the celotex is level with the top of the 50x100mm plate ive...

Surprised no replies!! Anyone recommend another forum for advice/ answers to these questions??

Hi guys ive built my extension to roof level which will be a flat warm roof design. 100mm brick outer leaf, 100mm cavity drithetm 32 full filled, 100mm aerated block internal leaf. Joists rest on 100mm internal wall leaf and innerleaf blockwork continues between joists and above. External...

Sorry Tony having probs getting any drawings lnto the site via my tablet. Thanks for these calcs. What sort of size beam would work more effectivley for eliminating the deflection? Im guessing deflection would be bounce in timbers? Would adding more between joist strutting also help? If I...

Yes the total span of room is 5m. The reason I was thinking of doing the midspan bearer is because half the roof (the original half of room) is already spanned the 2.5 m with 170x50 joists. I originally did plan to run the joists the 3.7 m span but this is proving more complicated due to an...

:oops: Yep sounds like English to me but Russian to everyone else! I will try to upload a drawing or two later but to try and make it easier if you imagine a rectangular area dissect it in half between the long lines that would be my midspan line. This line would be 3.3m long. The 170x50...

Sorry just realised an error in my initial post. the joist spans from each flank to the proposed mid span bearer would be around the 2.5m mark. Each joist and midway span will sit on 100mm internal blockand builtin with around 200mm brick work on top.

Hi guys im after some advice regards a small extension flat roof build I am currently diying. The extension is a 2.5m x 2.6/3.7 addition to an existing flat roof extension wnich will give us a much larger single storey extension to rear of house. Its an odd shape due to an underground...