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Hi, I have no soil stack on the outside of my house. The waste from the existing toilet (on the ground floor) goes straight down into the concrete subfloor behind the loo. kitchen and sink wastes go into a gully. I have built a new extension en-suite directly above this toilet, and I'm...

Thanks for your response pinenot. I was really just wondering if the osb at that thickness would do enough to support the acoustic pb above it, ie spreading the narrow loading of the joists, but I think I'll just play it safe for the sake of a few mm and use 18mm. thanks again.

Hi, I want to sound proof my mezzanine floor from the (rented) room below. I have read a load of threads on this and decided that I will use soundblock PB on the ceiling below (maybe 2 layers), acoustic rock wool 100mm between joists. osb, then acoustic pb then acoustic mat then floating...

Thanks for your replies. tony you're right, the proportions are all wrong. The joists are actually specced at 195mm so the projecting fascia would be pretty thick. If I were to step the fascia back to the beam like you say woody, the projecting bit would be around 350-400 thick which...

hi, I am rebuilding the rear extension on my Victorian terrace, and would like some advice on dealing with cold bridging and detailing where the roof meets the back wall (which will have 3m wide folding doors in it.) Apologies for the drawings, I suddenly got obsessed with this on a...

HAHA! Thanks, very helpful. :D

Hi, I am doing a full renovation of my 1890 solid wall victorian terrace, and before replastering would like to take the opportunity to insulate the external walls. so far so good. My builder has recommended rendering these wall with a waterproofing additive (sika) first, then...

Thanks Ronny, Again, I really appreciate your help. I guess its better that my SE has way overspecced this plate than under. I'm actually a bit reassured that your calcs aren't wildly (within reason) different to his. As is, I'll have to go with his recommendations to get it all...

I pop off to watch masterchef and have a pizza and the thread blows up! Thanks for all your input. Ronny, I really appreciate your advice, and would be interested to see what your calculation would be. The problem for me is, unless you had the relevant qualifications, and I were to pay...

:lol: Managed to haggle him down to 45mm!

Well, just talked it through with him, and he's convinced. Said he raised an eyebrow too when the software gave him those dims, but he checked by hand and it was right. Stated that there was roof loading, floor loading and a potential mezzanine on the attic deck... all adds up. So, I'm...

Thanks again ronny. It's a bit of a bind isn't it. You need the se for these calcs and have to go with what he specs to be insured etc. dont suppose building control would ever down spec an element... even my steel supplier thought this was crazy. Will let you know what his response is. J

Thanks again ronny. It's a bit of a bind isn't it. You need the se for these calcs and have to go with what he specs to be insured etc. dont suppose building control would ever down spec an element... even my steel supplier thought this was crazy. Will let you know what his response is. J

Haven't heard back from him yet, but his prosteel calcs seem to back him up on this... :|

Right, I've looked at his drawings, and they state that the KN loading on each end is 45.66... Was your loading a total (ie 25 each end) or 50KN each end? J

Thanks again Ronny, I'll give him a call and let you know how I get on.. J

Hmmm. Thank you both, I thought as much... As for the loads, its a 2 up 2 down victorian terrace built circa 1895. There will be no masonry load on this beam. the 1st floor will bear on it, and also the roof, but I wouldn't have thought the loads would be extreme. So, how to broach...