My construction employer has issued new employment contracts and most seem to be similar to what I get now, just in writing except for superannuation. The employment contract states my normal hours are 40 hours, but I normally do about 50. They increase my rate of pay and pay a flat rate for every hour worked and superannuation. The increase is to cover all sorts, including overtime and leave loading, site allowance, etc. Now they only want to pay 40 hours of superannuation and not pay for any hours over that I work.