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Old 07-05-2019, 01:37 PM   #1
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Hose fed underground sprinkler system


I redid my lawn last summer from the rocks up. I also had my neighbor who worked for a landscape company designing sprinkler systems, design one for me. He also put it in for me.

It was designed to run off of a hose end timer. The one problem that we had, even though there was plenty of pressure at the hose bibb, was that it didn't translate to a lot of pressure and volume coming out of the sprinklers. We had to split it into two zones.

This spring I went to see if if the sprinkler system survived the winter, which it did, but the sprinkler zone control didn't. To replace it would cost $60 and I thought why not see about switching to a real sprinkler zone control.

Here is my thinking:
  1. Run a new 3/4' line from the main branch to a new location on the exterior of the house. Put a ball valve with drain near the wall.
  2. On the outside of the wall, install a tee and run a pipe up to a hose bibb to allow for draining the line in the winter and for occasional use.
  3. The other end of the tee is a run to the sprinklers.
  4. Install a manifold system in 3/4" pipe to connect the valves to.
  5. Run 3/4" pipe to a reducer to connect to the 1/2 pipe for the sprinler zones.

Do the valves for the zones need to be buried or can they be above ground?
Can the piping to and from the valves be PEX or Poly or do they need to PVC?
Is PVC UV resistant?

The reason for these questions is that there is concrete where new 3/4" line comes out and extends out almost to the point where the pipe from the zones come out of the ground.

Thanks, Ktown
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Old 07-05-2019, 04:01 PM   #2
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Re: Hose fed underground sprinkler system


The valves need to be weather protected, and drained in winter.

PVC in this high altitude will deteriorate quickly, be ready to repair / replace it in 4 or so years.


ED
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Old 07-05-2019, 05:19 PM   #3
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Re: Hose fed underground sprinkler system


Quote:
Originally Posted by de-nagorg View Post
The valves need to be weather protected, and drained in winter.

PVC in this high altitude will deteriorate quickly, be ready to repair / replace it in 4 or so years.


ED
Ed, the valves and the rest of it will be protected from the weather to some extent. I have a shed on the side of the house that is three sided with a metal roof. I am planning on some lattice on the 4th side to give it a bit more protection and make it less of an eyesore.

I plan to blow everything every winter. I have a 20 gallon compressor for that. I would do one side at a time to make sure I have it completely blown out.

I can keep the PVC in the shed for added protection and just have the poly from the shed out if that would be better.

When should I transition from 3/4" to 1/2"? I was thinking closer is better but I can do it right after or at the valves if needed.

Is there anything I can do to make PVC more UV resilient?

Thanks, Ktown.
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Old 07-05-2019, 09:20 PM   #4
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Re: Hose fed underground sprinkler system


Quote:
Originally Posted by ktownskier View Post

Is there anything I can do to make PVC more UV resilient?

Thanks, Ktown.
A couple of coats of enamel paint will certainly help. Use white or any light color and make sure you coat all sides of the pipe fully with each coat.
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Old 07-05-2019, 10:09 PM   #5
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Re: Hose fed underground sprinkler system


Someone here was asking this question about UV protection of PVC,
a few days ago, and I suggested getting some split foam insulation, and wrapping that over the PVC , then using Gorilla Tape as a wrap for it.

I think that might be sufficient.

Sure beats letting the sun burn the PVC up.


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Old 07-06-2019, 07:17 AM   #6
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Re: Hose fed underground sprinkler system


Yeah Ed,

I was asking about PEX though. I had made an extension from an outdoor spigot that was stuck behind an outdoor shed and I brought it forward in front of a shed.
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