How to Install In-Ground Sprinklers | This Old House

How to Install In-Ground Sprinklers | This Old House

Kevin we're going to operate our irrigation system off of this hose bib now the first thing I need to check is how many pounds of pressure are coming out of here I need thirty to run the sprinklers so what I did is I attached a pressure gauge to this hose bib and found out we have eighty psi so that's great we're in good shape the second thing I need to check is flow so what we're going to do is put that five-gallon bucket down and just open that up in time how long it takes to fill the bucket all right that's good Kevin so I got 30 seconds for five gallons which is ten gallons per minute and that's the number we're going to use to determine what type of sprinkler heads we're going to use and how many we want to water the lawn and the plants and not the house now I know it's nine feet from the house to this wall so we're gonna use spray heads that have an eight foot radius all right I'm gonna start you here pull the tape out and I want you to go out to eight feet and put in a flag for me all right so is this how we get our head-to-head coverage this nozzles gonna throw all the way back to the first and the first is gonna throw all the way to the second yep no dry spots all right I'll go right down a sixteen now all right sixteen all right Kevin here's the process we're gonna dig a six to eight inch trench right down the middle of the lawn and then into that trench we're going to put this 1 inch poly pipe this is our main water supply we're going to tee into that and attach to the tee is going to be this flexible pipe which will allow us to put the sprinkler heads right next to the wall Kevin a polyethylene supply line comes and rolls a three hundred feet what I want to do right now is I'm going to cut off a piece about eight feet long using my pipe cutter okay we're gonna take and lay it in the trench all right you good down there yep all right lay that right down in the trench cover it up in the middle all right once we get this covered up Kevin we're going to attach a 3/8 flexible line to this end now we start by sliding this one-inch clamp onto our 1 inch poly pipe I'm gonna heat up the end of the pipe you're just softening it that's right so I can slide this fitting in the end okay once that goes in we'll slide that up and I'm just gonna take and crimp it off with these chrimbus okay so just compression right I just tightened up that hose clamp the hole that's fitting into place now we're going to attach our flexible pipe to the sprinkler head so same process right heat that end up plumbing in this case we don't even need a clamp who simply take and slide it on the end all right now that flexible pipe is all the way in on that fitting it's not going to come off all right with that end of the flex plate heated up I'm just going to slide it onto the connection it'll be nice and tight now the Flex pipe is tight on the fitting we're just going to lay this head rate down where we want it and backfill the line at the next head we're going to use this tee connection now this is going to go into one inch line now if you slide that clamp on either slide it in turn it that way yeah all right now we're gonna put on a flex pipe take the head and slide it right in now this orange cap is not a nozzle but it allows us to pull up and extend the riser now what we're going to do is going to take this orange cap off and the first thing I'm going to do is we are going to drop in a filter this keeps any debris from getting up into the nozzle and then we take a nozzle and screw it down into place so this is where we choose our 90 degrees or our 180 degrees model whichever one we want whatever we want screw it down in place and we're ready to go any time you install an irrigation system you have to make sure that the water from the irrigation can't contaminate the domestic water of the house and that involves a backflow preventer alright this hose bib already has a backflow preventer mounted on it and in this town that's sufficient it is but if you didn't have that backflow already mounted you could buy one like this simply screw it on and you would be legal in this town but you've got to check your local ordinances other towns might have different rules that's right okay so below the backflow preventor we have got a timer think of it as a splitter Kevin on this side we have an attachment for a hose where at any time you could get water for a hose this side is a battery-operated timer which will tell the irrigation system when to come on and when to go up perfectly sufficient for our singles no now we just make the last connections going to make our last connection you give me a little heat but all right I'm just gonna slide the clamp up you want to crimp that off let me go all right we're set to test the system cover that up for until you get out of there okay hey not bad huh


  1. I guess this was more of a demonstration video. I disagree with having the sprinkler head range over lapping that much. It will put out more water than the yard can absorb meaning most the water will end up in the road. Also, this will decrease the water pressure all around making it more difficult to do things while the sprinklers are on like showering. I have mine more spaced out and just run it longer. Same green grass with less wasted water & lower water bill.

  2. 80 psi? wow! can water the whole side of your street ! How about in the real WOrld of the The Middle Class? 30-40 psi and those on Wellwater?

  3. Hose 1/2” and 3/4” residential only allow 6 to9 gallons per minute.. which is very low volume of water, NEVER RUN A IRRIGATION SYSTEM OFF A HOSE BIBB, tee into main water supply for house….. the install shown should only be used to get shrubs established. The type of parts used simple won’t hold up I guess against the elements like a more traditional irrigation system with PVC pipe and solenoid valves( irritrol 205 with flow control, best residential and light commercial valve for the money… please keep out eddy Barrett Irrigation Facebook and and some YouTube vids

  4. This item is small in size>>> Β Β Β  but it is easy to install, operates as described and covers a regular sized lawn area. I would recommend this item.

  5. Wrong wrong wrong you don't water turf and landscape at the same rate and the flush cape stay on till you blow out the system then you nozzles it

  6. @3:59, prob not a wise move stabbing the shovel right near your shallow depth line you just ran smh
    btw, most modern homes have a much better backflow preventer inside the house already than one of those flow robbing tiny orifice ones.

  7. did anyone notice that he just jam the shovel in the ground right where he layed the hose at 3:59 ish lol

  8. ive installed hundreds of systems over 18 years! had my own business as well! (Rain Effect Irrigation) why doesen't he use a rubber mallet to hit the fittings in the pipe instead of heating the pipe…ive never seen anyone heat the pipe with a torch

  9. Psi and flow rate are interrelated as long as the diameter isn’t super small. So that was kinda redundant to test it twice lol

  10. This looks so easy!

    Cut to a scene of me with 100s of $$$ in materials in the hot sun in front of my house, calling a professional with all the tools to do the install

  11. whats the reason behind smelly water thats coming out of the lawn sprinkler? seems like every house is like that, where is the water coming from?

  12. i was planning on running my own sprinkler system. i figured itd be easy, not much to it, but a bit of back bone and poke a few pipes here & there… clicked on this just to get a few pointers but after watching, all i can think is WHAAAAAAAAAAAAH!!

  13. The "GPM" should be based ob the size of the existing water supply pipe running to your house. Using a bucking can result in inaccurate results…

  14. 3:59 is it important to spike the shovel into the ground near the pipe i just buried or is that more of a professionals secret trick?

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