The medium don't actually say they are suitable for below ground whereas the high do. Will this make any difference though if they are encased in concrete?
Hi,
Apologies if this is a daft question, I'm rather new to this stuff.
I need to put in half a dozen concrete pads (450mm x 450mm) for a self build conservatory base. The chap that measured up suggested that I put a few concrete blocks in the holes and concrete over these. Assuming that this...