Concrete newbie here. I am building a concrete pad for an A/C unit in an already excavated area of the yard (new plant bed). The excavated area is around 8" deep. I want to build a 4'x4'x16" concrete block for the air conditioning unit.
Here's a visual :
I understand that these are the steps :
Excavate slab area by 8" and backfill ~6" with gravel.
Level & tamp gravel base.
Build forms and adjust pitch of about 1/4 inch for every 12 feet.
Mix the concrete and pour into the form.
Screed and level out concrete surface
Float & finish surface
Water cure for a week.
I have a few questions :
Is this the right approach to building a very thick concrete pad/block ?
Is the base for this pad sufficient ?
Should I use rebar mesh to reinforce the block ?
I would have considered building this using pre-cast concrete blocks , but my masonry skills are next to nothing and I felt that pouring a block is easier than laying courses of concrete blocks.