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@JohnMo This was one of those things I tried to get a clear answer for from the architect, BC and the window fitters. For me I cannot see how its possible to solve that problem since the steel above goes from the outside to the inside. Per the architects drawings I wrapped the uprights in uber expensive space therm (the white in the pic) -- but honestly have no idea since it is air gapped from everything anyway so seemed complete waste of money -- I was going to put spacetherm on the top steel as well but when speaking to the fitters the doors were at least 20mm short of the top and they just filled it all with expanding foam, which I guess kind of addresses the contact between the window frames and the steel (at the expense of frame strength I would assume) but since that top steel goes all the way from inside to out I wasn't sure how to solve it. I've used 37.5mm insulated plasterboard across the top on the inside but really not if that helps of hinders. @Gus Potter Thanks for this. I'll give it a go over the weekend.

Thanks both for your detailed replies it is really appreciated. @Spinny They did the standard Origin ones, but these were just the door sizes, no reference to the wall. They actually came out twice to survey. There had been a long gap between when I first enquired and when I was ready to order plus there was a corner post to add detail too. I have the doors set in the middle of the cavity (just thought this looks nicer), and had cast a concrete base for them so there was no void. The other key advantage of this was that there are steels surrounding all of the apertures for both doors so something very solid to bolt into as opposed to the thermalites which I never want to use again. I was quite disappointed to see that the doors were a good 25-35 shy in height and width when they arrived, this was then just filled with spray foam. I like the idea of maybe removing some of the thermal bridging but it seems like it would be compromising the structural integrity of the door having screws bridging wide gaps. Originally they set the frame so that the cill sat over the brickwork but when I checked the next day they had set it back as they realised the door width was an issue. I had a whole thing with them at the time about it not being okay, they insisted it was fine and would sign it off. Spoke to BC control who's only input is 'a windows a window' and had no interest, so reluctantly accepted. @Gus Potter I'll have a go with your suggestions on checking plumb. I can see from the fact that the door has moved away slightly from the plaster that there must be some degree of stress on the door, but not sure if this is normal or not. I can only see this on one of the doors mind. The other seems okay (the one that is plumb). Not planning on changing anything myself for the reasons you've given. Some pics per my above response.

Thanks Spinny. Re the seal in the pic. Would you see that as a problem? The company that did mine came out and surveyed twice yet still managed to forget the position of the retaining wall in relation to the door opening which mean the doors ended up being set further back than intended meaning the cill didn't cover the bottom of the wall. They tick the box on looks but seem like hype in every other way. Described as the Bentley of doors but seem more like a ford escort to my untrained eye. My fault for not doing my homework.

Hi All - I've been fretting about the Origin bifolds I bought last year pretty much since they went it. There were a bunch of issues with how they were originally installed that probably tar how I see the doors and overall I've been incredibly disappointed with the doors vs what I was expecting. That said before I go back to the company that I got them from I wanted a view as to whether I am being too particular about them and this is just fine. I've attached some pics below. The primary issues I have are. 1. One of the door leans over when opened by about 10mm. This messes with my flush'ish threshold. I can work around it but the bigger concern is that the doors are so large and heavy that they are pulling on the frame. The door was not installed plumb (see pic). 2. When opening the door I was given strict rules that the door must be open and set back fully onto its magnetic catch before attempting to open the rest of the bifold. That if I didn't do this the doors WILL scrape against the bottom of the frame and could pull out altogether. 3. Exposed unpainted aluminium cuts. This problem is pretty much everywhere, every time I look at them I spot a new unfinished cut. This just feels really low quality to me. I can't understand why the cut sections couldn't have just been sprayed when they were cut. 4. Gaskets and seals - I don't know all the names of the parts but essentially some of the external seals are hanging out. Again seems low quality finish that was cut after by the fitters. The gaskets that hold the glass in have issues where they appear ot be bent and don't have a clean finish. Not sure if this really makes a difference to the weather protection? Would appreciate any views on whether I just leave it now. Thanks, Paul

It didn't occur to me to try and cast something directly onto the cill I like that, thanks. Torre - Thanks for the drain link. I couldn't find anything that reasonably priced for a shallow depth.

Thanks for this. Had a good look over the last few days. The only issue I think there could be is the cantilever overhang for the cill of the bifold. Unless I can sit the slab on a batten or something I don't think there is a bracket available to accomdate the extra 100mm overhang. Found a Robin Clevett video on YT the the other day doing exactly what I need with decking. I'm not that keen on decking but at least this would be a method I can be sure will work.

I really like the look of that as it's something I could actually do. (I'm for any job that doesn't have a clock on it for materials drying). The only issue I see with that other than maybe height of the floor is that I have a manhole in the middle of the space. I need to think about how I fix something down on the cill at the right height to provide that edge support. Thanks.

If anyone knows of a channel drain that can fit into a 47mm gap under the door I'm all ears. The only thing I can find is somehting that's £210 p/m plus crazy corner prices https://www.aquabocci.co.uk/products/a30-low-profile-drain-120mm-wide-x-35mm-deep Another reason to add to the long list of why I regret buying these overpriced hunks of aluminum.

That makes a lot more sense, thanks. This is screenshot from the origin windows video that I watched originally. It always seemed a bit suff to just lay onto the cill. Now need to find a cill that fits. Origin vid

Hi All - I need to tackle the patio behind the extension in the next few weeks and am looking for some advice on how something is usually done. The origin site shows you just laying a paver directly onto the cill which I cannot believe it an okay way to do this. There is supposed to be a weathered threshold between the internal and external floor with about 10mm difference. I am going to come down a bit more than that, say, 15mm to make sure the riddculously oversized doors don't have any clearance issues. What is the right method to bring the slabs right up to the door frame over the cill here please? Not sure if heat related expansion and contraction needs to be considered for the aluminum cill as well. Planning to use large format porcelain pavers. Any advice welcome. Thanks, Paul

So looks like the jet spray test was a good shout. The coating won't be tough enough to withstand foot traffic. I quite like the raised grain effect it leaves behind, but the finish is too inconsistent to be useable. It's a shame as this is really nice timber.

Thanks. These were the concerns I had. The cladding I bought was pre-charred but with a square edge (didn't realise when buying, doh!) so to get the look I wanted I had to route off a chamfered overlap and char the edges. Whilst I prefer the look of my charring on the edges (crocodile look) I have no doubt that it wouldn't stand up to much poking and prodding, even with a sealer. The IRO stuff I bought does seem to be more hardy and the finish seems to have been scrubbed before they coated it. I'll give the jet spray a good go over the weekend and report back

Hi All - I was wondering if anyone has used or had expereince of using charred timber for decking. I've used it to clad my extension and am very happy with it. I've never liked the standard fluted look and out of principle am not going to pay millboard prices. I am not worried about slippage as I think that is a universal issue regardless and comes down to good maintenance. Cheers, Paul

Thanks. It really was a nightmare to start with. I am most impressed that I didn't managed to put my size 13's through any of it. I would say they are relatively soft. There is a lot of sag in them now, to the point now where some are beginning to give way. Artex actually makes sense as the pattern is not consistent throughout. If that's the case I can potentially just replace with equivalent thickness of ply and try to replicate the pattern.

I did for a change I reckon I pulled out at least a couple of hundred dead mice.