I have a garage floor to do approx 6m x6m. I've read (nhbc technical guidelines) that reinforced floor slabs > 16m2 should have a construction joint. Also, as i have to do it myself i would much prefer to do it in 2 sections anyway to make the job more manageable. The trouble is that i am having difficulty knowing which type of construction joint to apply and the best method for doing so. Advice please.