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Hello, I was wondering whether anyone could offer any thoughts or advice about the following threshold detail. I'm actually an architect myself and am working solo, so I don't get the benefit of second opinions. I've always worked on larger schemes at the earlier 'conceptual' stage of projects so my practical knowledge of construction details is a little rusty now. This spring, I'm piloting a digitally-enabled kit-of-parts construction system assembled from cnc-cut plywood or OSB that I've been in the process of developing over the last year. Its just a small garden room, so I'm not too concerned about U-values, but I am trying to achieve airtightness to test out how all the details work before I self build our family home next year. I'll then have it tested to see how airtight it is. So, on to the detail - see image attached. Here's the floor build up from top to bottom: 50mm brick pavers, 10mm mortar bed, 18mm T&G Wisa Ply floated floor, 60mm Rigid insulation, RC slab. I'm thinking I can just secure the concrete threshold piece into a bed of mortar over the floated ply substrate - just like the brick. The DPM coming up the slab edge can fold over and tuck under the threshold piece protecting the exposed edges of ply and insulation. An additional waterproof board will go over the DMP too. The only reason I'm questioning it is because I haven't found many examples of how it is done online and so am relying purely on my knowledge/research and common sense. Anyway, any thoughts greatly appreciated. Thanks

The original door we were going to use for our side door is a bit knackered and my builder has said he would have to charge me £450 to refurbish it and I might as well get a new one. Although it's Sapele and nice and heavy and had a nice Banham lock, it has a rubbish U value and the wood may have rotted in one part, so I think he's right. Can anyone recommend an external door with a fairly good U value and preferably PAS24 or similar rated. Really doesn't need to be passive standards, just something in the 1.1 region that is fairly airtight. I don't care what it looks like, but it needs to be secure and open outwards. No glazed panels to keep it cheap. I probably also need a door frame.