New installation for Manufactured home

So my husband wants to install the pipes for our home. We just had it placed and the water meter is 100ft from the front right corner of the house. How far down does he need to trench the ground? What size of pvc pipe do we need to run from the meter to the house? Is there anything else we need to know before he does it? We also know we need a 3" or 4" pipe to lead to septic.

Welcome.
Your water main need to be at least 12" below grade, and a min. of 3/4" sched. 80 PVC, sched 80 is better safe than sorry.

Is there a big difference between the 1/2 and 3/4 pressure wise? Also what is the difference between the 40 and 80 sched? We were trying to price materials and the guy at lowes said 40 sched. Thanks so much. We are super excited to be home owners

A 1/2" main would be smaller then the internal distribution piping within the dwelling. At 100' I would be concerned with a loss of supply over an extended period and multiple fixtures operating, it probably wouldn't happen often, just at the most inopportune time.

Sched. 40 is a default position, however, what can go wrong will.

3/4" is a standard meter and if you are planning on sprinklers and a lot of gardening you can ask for a 1" meter.

I've always used sched. 80, because I warranty my installation for as long as the person occupies the dwelling.

Budget for contingency, you'll thank yourself later.

On you waste line, generally a 3" requires a slope of 1/4" per foot, and a 4" requires a slope of 1/8" per foot.

You have helped a bunch. Thank you so much.

It really depends where in the world you are, in montreal you require 1 inch copper entrance six feet deep.

Lytle, tx

Codes vary wherever you are, but if you ask at a plumbing supply store (NOT Lowes, Home Depot or a local hardware store), the friendly counterman will know what the Pro plumbers in your area do because he sells them those supplies. Return the favor by buying your pipe and fittings from them while you're there, which will be likely be cheaper and/or better quality than what the other places sell. Also ask them if they carry stuff for mobile homes, as most regular faucets, sinks, etc are different and won't work for you.

Phil

Where you are in TX, 12 inches deep is fine. Personally, I would put it a little deeper (16-18") in case someone in the future is digging around in the yard and less chance of accidently hitting it. I once had a leak in a water supply line that was 150ft+. I replaced the line since it was over 40yrs old at the time (I figured the old line was going to keep developing leaks if I just tried to find and repair it). I upgraded it to 1". I used rolled copper and yes it was expensive, but to me worth the investment to decrease the friction loss from such a long run.

3/4" will have about double the avaliable flow as a 1/2 pipe.
1/2" should never be used be used for a main supply line!
SCH 80 has a thicker wall so it's stronger.

I am also a Texan .

My wife , middle son and I replaced our water main to our house . Between Christmas and New Year , almost years ago .

The old line was 3/4" copper . The new ditch was more crooked than the old line , so I up sized it to 1" PEX ( crimp on brass barb fittings & copper crimp rings ) . Also , 3/4" PEX fittings of that type have a smaller ID ( Internal Diameter ) than 3/4" . I used about 75' of 1" PEX , all together .

I rented a mini-excavator from Home Depot . All day for the ditch & 1/2 day the next day to cover it back up . The ditch ended up coasting much more that the pipe and fittings .

The white PEX I used is somewhat flexible . No 90 degree fittings were needed . It is said not to be likely to burst if it freezes .

If your ditch will be a straight shot , you may want to use a trencher .

My ditch varied from about 24" - 32" deep . Using power equipment , I see no reason not to go 24" deep .

Measure the length of pipe you will need . I used most of a 100" roll . I could have used PVC , but PEX is suppose to be more resistant to freezing . There are other kinds of pipe available in rolls , but I can not say which is best or legal .

Best of luck to you ! Let me know if I can help .

Wyr
God bless