So how are we going to build this....
You think getting planning is the final hurdle, and then you start talking to building control, structural engineers and steel manufacturers! Thank goodness we didn't have to talk to builders as well, as we had made the bold decision to do it all ourselves. I am a plumber by trade with a weird niche sideline of repairing solar thermal systems so i have some site experience. Having worked on a lot of new build single plot sites and with a variety of builders, project managers and architects I assumed i would manage it all ok. As we had preemptively done the Nudura ICF course for our 'never to be new build', i decided to do the basement at least in ICF. I had considered doing the whole extension in ICF - see picture, but in the end stuck with just the basement. I would come to regret that decision later on....
Due to the slightly weird nature of the existing house with steep pitch roofs coming into the first floor rooms, the design needed a-lot of steel work. Also with the basement starting about 4m away from the back of the old house we need some fairly substantial foundations between the old house and the basement, as well as a couple of enormous steel posts to help hold up the extension walls.
I had done a consulting call with The Green Building Store and discussed the options for making it all airtight and highly insulated. I decided on External Wall Insulation (EWI) over the whole building, and also filling the existing cavity with beads. As we were going to build the extension ourselves, and we weren't (yet) bricklayers, we decided on solid block-work walls for the new bit. They didn't have to be extra neat as it would all be covered by the EWI. The engineer suggested lay flat block-work, as it was stronger and would sit nicely on top of the basement ICF walls which have an 8" core.
These were each 18kg 7N dense concrete blocks and i calculated we had to lay 2700 blocks. Like i said, i would come to regret that....
Edited by Kai casswell
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