When I moved out to the Philippines its something that I have seen in most households but not something I have worked with before so took a bit of time out today to photograph one being built in the new apartment as it was built. The original workers got fired due to putting the sink in backwards as well as several other things so I reformed the opening myself on the plywood and got a worker I could trust to do the rest of the work.
First thing you will notice is the metal bars drilled and fixed into the walls this is to give the structure strength but also to tie it into the wall. There are bars currently missing as the hole for the sink has been moved. The white piece is the finished height of the concrete and where the basin will drop into it. So making sure the hole is big enough for the sink and in the right place is a major thing to double check when doing this.
We have now added a front frame which will also re-enforce the jig as well as give the front edges of the concrete as you can see better in the photos below.
As you can see here the two sides are being formed to allow concrete to drop into it on the right hand side. Added to the front frame will be other pieces of scrap plywood to bring it up inline with the white frame that will give the finished height of the concrete.
The concrete now poured on the top and side. Will take a couple of days to set in the current weather as its been a bit rainy which is good to be honest as it won’t dry out too fast so unlikely to experience any hairline cracks.
You may be wondering what is happening underneath? well I will be making several doors and a wine rack to form up a few cupboards and drawers to the unit out of local wood. Each unit will have a lower and middle shelf as well.