I have a metal shed/garage. When I laid the concrete base I ended up with a slight dip in the middle on one side. So the shed is erected square and true and on three sides it sits nicely on the base. Down one side of 5 metres, the front and the back touch the base but about 2 metres in the middle it doesn't. The biggest gap in the middle is about 15-20mm.
What is the best thing to fill the gap? I think it's too much to use silicone and wasn't sure expanding foam was the best idea? Or should I fix some sort of plastic strip on the inside and silicone it?
It's just to stop the rain running in. Round the other sides I just run a bead of silicone between the metal frame and the concrete.
Thanks in advance
Chris.
What is the best thing to fill the gap? I think it's too much to use silicone and wasn't sure expanding foam was the best idea? Or should I fix some sort of plastic strip on the inside and silicone it?
It's just to stop the rain running in. Round the other sides I just run a bead of silicone between the metal frame and the concrete.
Thanks in advance
Chris.