Because of the lower PSI the distance of the spray rarely exceeds 15ft. Meaning that spray heads should never be placed further than 15 ft. apart as this would create dry spots (i.e. dead grass) in your lawn. It is always important to install sprinklers with overlap for full coverage.
By allowing each sprinkler head to overlap with one another you create a consistent layer of watering. Meaning each area of your yard will have nearly the same amount of water applied. On average rotor heads general spray 30 feet, therefore they should be placed 30 feet apart from one another.
Sprinkler heads must be a maximum of 12-15 feet apart, depending on the hazard rating of the space (it ranges from Light Hazard to Extra Hazard 1&2), and at least half that distance from the nearest walls (typically 7.5 feet away).
Nothing should be in that area between the bottom of the sprinkler heads and the imaginary horizontal plane parallel to the ceiling that is 18 inches below. This is done to allow an even and unobstructed spray pattern from the sprinklers when triggered to extinguish the fire.
1.3 lays out the “Three Times Rule” which states that unless specific requirements are met that “sprinklers shall be positioned away from obstructions a minimum distance of three times the maximum dimensions of the obstruction”, up to a maximum of 24 inches (0.6096 m) though the “maximum clear distance does not apply ...
A common rule that is followed for obstructions within 18 inches of the sprinkler deflector is the “three times rule”. This requires sprinklers to be positioned away from obstructions a minimum or three times the maximum dimension of the obstruction.
You can operate 2 or 3 sprinklers at one time with 'Y's and extra hoses, depending on your water pressure. To run more than one sprinkler off the same faucet, attach a 'Y' to your faucet and run a hose to each sprinkler.
Meaning that spray heads should never be placed further than 15 ft. apart as this would create dry spots (i.e. dead grass) in your lawn. It is always important to install sprinklers with overlap for full coverage. Spray heads have a higher application rate than other sprinkler heads.
Running multiple zones at once is usually not possible due water-pressure and flow limitations at residential properties. As with any standard irrigation controller, you can wire multiple solenoids/valves to the same zone output if you want.
3.3, branch lines shall not exceed eight sprinklers on either side of a cross main.
I'd suggest trying energizing only one zone at a time, to see if just one zone behaves differently than having them all on at the same time. How many sprinklers do you have? If you have a bunch, and they are all on at the same time, then the pressure would be low, and likely not enough to "pop up" the heads.
Minimum Distance Between Sprinklers: typically 6'-0". Distance from Ceiling: minimum 1", maximum 12" for unobstructed construction. The minimum 1" is typical; however, concealed, recessed, and flush sprinklers may be mounted less than 1" from the ceiling and shall be installed based on their listing.
Count up the number of zones you have in your design. That is the number of irrigation valves you will need. In the example on page 8, we will need eight valves because we have eight zones. This will also affect the size timer you will need to buy.
The sprinkler pipe size from the water supply source to a sprinkler shall be not less than 3/4 of an inch (20 mm) in diameter.
In head to head coverage, every spot in the irrigated / watered area needs to be covered by at least 2 sprinkler heads, and each head should throw water far enough that it reaches or slightly overlaps the adjacent heads. This is done by considering each sprinkler as a geometric shape.
One sprinkler does the job pretty well. And while my setup doesn't reach the edges of my yard, I do have the option of installing up to three additional Quick-Snap sprinklers down the road. These can either be daisy-chained together to function as one unit or used independently when needed.
My recommendation is to bury sprinkler lines 8-12 inches. I usually try to keep a standard depth of 10" because it provides more safety if I need to do some type of ground work so I don't have to worry about hitting lines. A walk-behind rototiller generally won't go deeper than 8".
Sprinklers should be set to run for about 30 to 35 minutes at a time twice a week. Your goal is at least 1″ of water a week for your lawn.
Watering every day is not advised. It should be done 2 to 3 times per week only to prevent a shallow root system. If possible, water during the early morning hours to ensure that the lawn dries entirely before nightfall. However, watering at any time of the day is better than not watering at all.
On average, it will take 30 minutes to get a half inch of water. So, 20 minutes, three times per week will give a lawn about an inch of water. This formula works best with healthy, well-cultivated soil.
Or, if you prefer, simply leave the irrigation design up to an installation professional, so you can be guaranteed head-to-head coverage. Typically, though, a sprinkler system zone will boast 5 to 6 rotor heads and/or 8 to 10 spray heads.