If I lift a patch of grass it looks like the roots are not in the soil, and they look yellow and decaying. The person who take care my garden use a hose to water the grass everyday, also he does it during the day when is very hot. I believe he is applying too much water. Any advise will be wellcome.
Dont water grass during hot afternoons…it burns the grass.
Try watering at night or in the morning.
Use fertilizer!
call local gardener
I’d try applying turf builder to it sounds like it needs nutrients also if you water in hot sun it will burn your grass and its probably getting too much water depending were you live of course
Your lawn is obviously suffering from lack of proper care ,you should ask your gardener to rake it thoroughly to remove all dead grass then spike it to aerate the soil followed by a good fertilizer rich in nitrogen if there are weeds wait for two week after you fertilize and then apply a weed killer.If you live in an area that gets a lot of hot sunshine try to water only in the evening as this prevents the moisture being evaporated by the sun