trench foundation

Hi Guys, Any issues with placing 50mm xps insulation slabs externally in the trench below dpc/ground level before backfill? To help with insulating the building? Please see pics.

Hi Guys, So i have my trenches dug amd in certain areas due to limited space for the digger the trench is dug a bit wider (80-90cm) - i have some old fence panels lying around.... Will these work to shutter the trench?

I’m building a rear extension on my end of terrace bungalow, my Architect has specified a 600mm x 1000mm concrete foundation. At the adjoining boundary to next door we have a concrete post fence, the 150mm of foundation on that side of the 300mm cavity wall will need to go slightly past the...

Hi we have some structural calcuations and drawings which ask for the following: "Minimum foundation formation level 1000mm from ground level" "New 450 M/C Trench Foundation" Does this mean that we need a trench foundation like the following? Thanks!