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im using 69 x 38 cls - so the frame is 69 "high"

sorry ! maybe im not explaining correctly or using the word noggin incorrectly - i currently have a rectangle of wood that is 2.4m x 1.13m on the ceiling. i want to put a single sheet of 12.5mm plasterboard on it. do i need to make it into a "ladder", if so how many rungs?

do you think a 1cm difference between the height at each of the long ends is too much or am i worrying about nothing?

oh great, just one? i was thinking 10! thats great! im gonna make a star ceiling (it'll be above the bath if ever get that far down the line....)so will be using one single piece.

hi hope you are well. i am making a new ceiling under a lath and plaster one. it is 2.4m x 1.13m so not massive... i have made a timber frame around the perimiter of the area. 1) which thickness plasterboard do i use 2)do i need noggins, if so at what spacing please. thanks in advance for...

:)

Arup?

and the more fun

treu. also the screws. the air will be slightly less dense under the bath too when i use as it will be warmer,giving some lift, so ive got that to look forward to

"It's not just the bath they're sharing - it's also a huge amount of water. Nice, dense, water." yup, 1kg per litre give or take.......calculated that in already ...we did that earlier in the thread

" you're probably over-thinking all this " yes...i do that! thanks tony. appreciate it. i'm going with the joist sandwich, as im going to build a plinth anyway, may as well do it on the actual joists. thanks to you all.

Rather than sistering, what if I put 8 x 2 above the existing joists ..so we have a 8x2 --floorboard--8x2 sandwich. Will this have same structural effect as sistering? I'm going to puth the bath on a plinth anyway so this is a lot easier...

sounds like fun! unfortunately it will probably be one of my kids....

leofric - i do have one, but its no use here, all iserves is to make me worried...but, maybe better to be worried than do something dumb...

forget weight of water - i wont! i haven't! i already included it! lay ply - i am going to make a step, a big frame for the bath to sit on, i already said that...its gonna be at least made out of 2 x 8 , i need to build a step up to it anyway. i could lay that on a layer of ply, which then sits...

and actually, i made it from 8 x 2 simply because of the load tables.....

"(Both morally and structurally.)" -lol - depends who it is...the wife might have a different opinion! tony - i appreciate that massively, i have a degree in physics from a long time ago. i think you can tell i didn't do applied physics (engineering)...and i also appreciate that people spend a...

woody - almost mate, but not quite - the main house is 1910's...it was extended twice, in the 60's and 80's...the bathroom is actually split across the bit where they extended the old 1910 house in the 80's. the old back wall is in the middle of it. you can see it in the video. i thank you for...

That's correct it's not aquatic science..its physics. If it was a cast iron bath the answer might be different. The definition of "domestic bath" is meaningless unless you can define it in terms of a maximum load, and domestic floor carrying capabilities similar. A house from 1910 (which mine...

yes, but what kind of floor and what kind of bath?? if i took my bath as being my old 8' x 2.5' x 2.5' fishtank, im not sure your statement is true...