We thought about it for our dog run but of course a totally different use I think the irrigation is a bit overkil for fake grass I would however think about the weed barrier . Can you post pics of the space you are working with since if you hav eother stuff planted that needs water that will make a difference .

Where do you live? We're in FL so we have tons of sprinklers and they are always breaking or needing adjusting lol. We're going to do an area of turf in our yard and we are relocating the sprinklers so they don't hit the turf at all. They run off well water so I wouldn't want that sitting water on the turf. DEFINITELY weed barrier!!

Eventually, weeds popped through my turf and they are a pain to deal with. Took 5 years before they made it through. I never rinse off my turf but I'm in Florida and we get plenty of rain.

Our artificial turf has weeds so I would install a weed barrier as they are a real pain to remove. I like to think the weeds make it look more real. LOL

We hose our turf down a few times a month to remove odors from our dogs. I would not do a sprinkler system on it because the cleaning needs more water pressure than you can get with a sprinkler. About once a year we use a cleaning product to super clean it. Cleanng would be unnecssary if we didn't have dogs.

We install turf quite often. Weed barrier is typically not a requirement, but it couldn't hurt as you state. If used, I would put it down on the excavated soil below the imported gravel base.

If you are replacing a natural grass lawn with synthetic turf and want to keep the sprinklers, I would cap off the heads that are inside the turf area and only have heads just beyond the edge of the turf. We only keep existing sprinkler systems that are dedicated to a lawn as a way to cool down the turf during hot weather as synthetic turf does get hot in full sun and hot weather.

Cap the sprinklers. Install the weed barrier.