door cavity

Hi I’m in the process of laying wood flooring and after taking up the carpet and underlay I found the screed and concrete on the floor inside the front door was crumbling away. I’ve cleared it up and found this plastic item which was filled with concrete. Can anyone tell me what this is and...

Hi All, Hoping i can get some assistance, my builder seems to have gone walkabout as I started finding some flaws with his work and after making various excuses that everything was fine he is no longer responding to me. I was in the midst of a garage to habitable room conversion, but noticed...