Pocster

Would MVHR not solve this issue?

I see! (worried look on face). The answer is ..... I have no idea!. Architect hasn't spec'd anything for that; nor has timber frame company said anything. Is the sole plate though equally OSB/ply clad with breathable membrane? or is it just the 'structure'? Erm, so how should I solve the sole plate condensation issue???

Hey! The timber frame sole plate will sit on DPC on a 140mm wide (140mm deep) brick 'wall' that I have to build. The majority of timber frame designs have the insulation in the timber frame void - which is fine for me even if different to the architect's spec. What I am tempted to do here is have the timber frame (just at the front as in the photo's) tight to that concrete block run (effectively the external wall); then the timber frame would sit on the block work which in turn is on the steel i.e. supported! so insulation internal. If BCO complains; then I could insulate externally. Why though does external insulation (and say then clad) require no cavity?. This is my real concern....

I'm guessing the 'cavity' only applies when the insulation is outside the timber frame? i.e. thermalite external wall tied to timber frame (where insulation is inside the timber frame voids) does not require an external cavity?

Yeah; it is rather weird isn't it. Typically not thought through correctly. My pocket door though solves the entire issue without involving BCO so that suits me!

I'm guessing there are different ways to solve this. My spec confuses me. On the side walls we have 50mm cavity. But no cavity on 2 end walls; why would that be? Does it matter whether the insulation is external to the timber frame ; in the timber frame void or where possible even both? Is it critical? Other timber frame supplier quotes offer different 'systems' i.e. they basically ignore my architect's design for the insulation make-up. (I'm guessing as the timer frame company 'sign it off' effectively with their SE I follow their guidelines....)

Hey all, My architect's original spec was for a 100mm timber frame. It would appear all suppliers min is now 140mm. It's not a problem apart from 1 issue. The steel works at the time etc. were designed for 100mm. So (please see photo's); whilst the timber frame can follow my block & beam but by the time it reaches the stairwell there's just the steel left spanning (which isn't wide enough now). I assume quite sensibly ( I hope! ) that the timber frame can't span that gap unsupported? I could put a nice 2m lintel across. But as the timber frame is structural I assume I need proper advice on that? Timber frame supplier hasn't got back too me yet; but I think they'll say 'your problem' .

Yeah could be. It is quite bizarre though that a wheelchair'd person could enter the property and use the bathroom but couldn't get down the stairs anyway to the kitchen!. I appreciate this door design in say a bungalow . We will probably go for a pocket door - solves all the issues.

What about a steel sheet bolted across to make this extra floor? Surely I don't need an SE for this - cost more than the steel...... Oh architect! ; please design stuff; not just nice pictures.....

OK; I will - thanks Now guys!; this Nib!!!

Crumbs!; there's some reading there!. Thanks for that!. I do see that the door usually opens outwards .... straight into the face of the occupant leaving the bedroom! Though I could integrate a sliding i.e. expensive door for the bathroom.......

Ok!. But if it opened inwards would the opening width not be the same??? By the drawing I would *assume* with a door inwards you could still get a wheelchair in. If I do change this am I likely to get in trouble from BCO?????

Hey all, Firstly happy Easter!; not too many eggs now ...... Please see plan attachment.My subtle arrow shows a floor 'nib'; but how do I construct this? There's a steel running parallel to it (can supply photo if that helps). But how do I build this self supporting bit of floor??? Also; opinions please. The architect has the bathroom door opening into the hallway and potentially someone's face as they leave the bathroom. Surely the bathroom door should open inwards? i.e. into the room. Or is there a potential reason he designed it like this that I am missing??? Thanks all!!

Bco thought 50mm insulation was fine . perimeter ? What do you mean exactly ? The insulation upstand ? Cheers

BCO is out today ;I'll see what he thinks - usually he is somewhat dis-interested!

Wow!; that's a chunky floor!

Shouldn't be ; apart from 1 - it's placement won't change . Tf guy said just to do bricks for tf base on internal walls I.e thinner

The tf guy said to check with boc if insulation as well in timber frame void . the tf at 140mm sat on b&b ; at the edge of b&b which in turn is sat in reinforced concrete walls . So nothing should be sat on un supported b&b if that makes sense . cheers

Inner supporting walls???? Timber frame guy 'suggested' . Timber frame; insulation in-between (though check with BOC); membrane; then batten to allow for utilities + plasterboard and skim. So breathable membrane 'outside' (though still behind insulation and external blockwork) ; internal vapour barrier (???); just truing to make it super air tight I guess, Cheers

Bristol. I have usually used Kellaway ; haggle a good price. But that link above I've given seems a good bit cheaper than TP!

A new google attempt at 'concrete 140mm commons' brings me this http://www.carvers.co.uk/products/BRICK-PD-CONCRETE-215X140X65MM-COMMON-320-PER-FULL-PK/P110012 I have learn't that the wording is everything when you aren't sure what you are looking for!!

Ah I see. Sorry I thought you got it wrong!! This 2 course wall is the 'internal' wall just for the timber frame to sit on. My external wall is thermalise with 150mm insulation behind it. So I'm not sure the thermal performance of the blocks against the B&B is a great issue????; it maybe though!!! BCO is coming tomorrow. From my experience he genuinely won't be that interested!!. I 'felt' it was expensive; but trying to find similar online at a sensible price is challenging . Appreciate all the help!

Only 100mm wide

https://www.travisperkins.co.uk/Pd-Edenhall-Concrete-Common-22N-Solid-Brick---Pack-of-320/p/361730?gclid=CMuotqqmn9MCFUu6GwodbmoMSA This not better? 2 courses?

ok!