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Looking at the idea of building my own bungalow type home using light steel instead of timber framed to make up wall panels that join up on site and bolt onto concrete slab. General idea i was toying with is a 50*50 box inner and outter frame sandwiched together and then studed out as normal on inside to accept gyproc and either vertically or horizontally on outside depending on what cladiing option was used. Then the inside cavity to bi insulated either spray on or kingspan or most suitable ie cost effective method. Below is a quick mock up with spare lengths i had. Its dimesions are 12 foot by 8 by 12 inches but those can be moved around perhaps 8 or 10 inches thick would suffice as timber studs in this case would likely only be 6*2. Anybody else looked at or done anything similar any dos and fonts any info on building regulations for such a method would be appreciated thanks. Or is this a daft idea lol.

Hello, We are designing a 4 story carbon neutral, built for purpose office block on stilts (as it is in a flood zone). ICF was originally specified for the walls during planning phase to achieve the best thermal performance, air tightness, security and acoustics outlined in GBS's Sustainability SPD and client brief. This was also backed up by our sustainability consultant. Over the last year of waiting for planning permission, the client has taken a liking to the single faced ICF system (based on aesthetics) and the Architect seem to prefer the more traditional methods with steel frame with light weight metal stud, sheathing, cladding railing system and all the insulation/membranes/tapes/etc. In my opinion, I feel like we will struggle to achieve the above requirements outlined in the SPD with steel frame while the RC frame/ICF will provide these properties inherently. The only negative I can think of for the ICF although will be a heavier build and therefore more piles/thicker caps. If anyone has had any experience achieving almost passive standards with Steel frame/light weight metal stud and possibly also has ICF experience to compare the two, it would be greatly appreciated? Also, I was hoping to see if anyone has had any experience with the 'off the shelf' single faced ICF systems (Nudura/Integraspec) as well as potentially using systems like Quad-Lock that don't offer a single faced solution but could easily adapted to do so. (Fixings 8'x4' ply sheets too the ties at 12" H&V centres). The main reason for trying to "re-invent the wheel", is mainly cost of the material, cost of importing the smaller/expensive sections of pre-drilled wood from Canada and also speed of build. I am however, concerned about how well the wall will hold with pour heights of ~3m. Any suggestions would be appreciated. Many thanks