We are trying to partly level out our slab to build a subfloor. Most of it is level enough but a section that is about 20ft x 5ft starts to slope and fairly aggressively in some parts. I see self leveling concrete says it's only for up to 1-1/2". For anything beyond that depth should I fill with gravel? Use pressure treated wood? Regular cement?
Thank you kindly
Best Answer
If the goal is to install a subfloor, do the leveling in the supports for the subfloor. Once the subfloor is installed on leveled sleepers (joists but not spanning, since they sit on the concrete, whatever you want to call them) nobody needs to know or care what the concrete under them happens to be shaped like. And SLC is relatively expensive.