Sleeves for utilities and culverts - depth and material?

[Innovate1]

I am putting up a detached garage with a half bath so need electric, low voltage, natural gas, water and sewer (line to existing septic). Will likely go under the footing with most of those and come up inside the building to keep the outside looking clean. The exception may be the gas which may go through a side wall.

Is 160 PSI black poly adequate for the water? Don't know if I can bring this inside the building. Have seen they use thicker into homes here. Think it is 200 PSI that uses compression fittings.

On the conduits and water I think using sleeves slightly bigger than the final pipe/conduit would keep the final line out of the way of foundation work and eliminate joints there. Is sch 40 PVC a good choice for sleeves? For the sewer Not sure if I need 3 or 4 " but if 4" I have some scraps of 6" but it is thinner material. Might block out just above footing for sewer but have plenty of drop so probably easiest to just go under the footing.

Also am adding a gravel drive to the garage and crossing some existing lines - sprinkler, phone, water, gas, high voltage underground feed to utility transformer. Water, and high voltage is deep - at least 36". Phone is similar because it got put in with the water. Not sure how deep the gas is. Sprinklers are only about 6-8". Doing gravel because the road location may change a few years from now. Which of these do I need to sleeve? Sprinkler is easy - it's shallow and easy to splice. I don't really want to add the splices needed to sleeve the others as it just adds a point of failure.

I can talk to the gas and electric utilities. Other lines are mine. I can throw a pipe in where the phone line would go if it ever needs replacement.

I need to put a small culvert in one location. Not draining a large area. Probably use a 6". How deep does this need to be to avoid crushing? Will have some concrete trucks for foundation.

 

[MrSurly]

In my area, the gas line canNOT be under the slab or footing, even for a little bit.
It has to terminate outside the building and then penetrate above the slab


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[Innovate1]

In my area, the gas line canNOT be under the slab or footing, even for a little bit.
It has to terminate outside the building and then penetrate above the slab


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Could be. I don't know the local or general rules for gas. Easy enough to go through the wall. I did have a house with the gas meter in the basement but it was an older house and it still went through a wall not under a slab or footing, just did that below ground level.

 

[dcg9381]

I sleeve in sch 40 gray PVC with the transitions. It cannot be used for water directly. If I put water through it, I run a PEX line. I've even got a 2" PVC water line sleeved with a 3" PVC line

Note, my soil is nasty - lots of sharp rock, that's why I sleeve. May not be necessary for you. I sleeve water and data.

I've read that poly probably has a shorter life span than PEX, but again, that's just what I understand, but it'll probably outlast you and me.

 

[rustyjames]

Sleeving any utility into any structure would be best building practices. Schedule 40 PVC would be fine.

 

[tros]

I sleved every line uoder my drive way .I have 6 inches of crushed stone for the drive way and all the lines are 4 ft deep

 

[Innovate1]

I am not too worried about the utilities that are 3 feet deep or more under roads. The soil here is mostly clay so hard to imagine how much damage could happen at that depth although I could be wrong.

More worried about utilities running under footings and such like. I expect to run a sleeve of schedule 40 PVC large enough to run the pipe or conduit through it.

I do need to put about a 6" culvert in a drainage swale so it won't be very deep - only a few inches of gravel over it. Do I need to use steel pipe?

 

[jfish]

Sleeving into the building, use 4" sch 40. 36" radius sweeps under the stem. They will not crush.

Under a drive or future hard surface. Trench in as much conduit as you can afford.

The culvert. 6" pvc sch should drain whatever you need. Depth? 12" to top of conduit should provide plenty of depth for a concrete truck.

All water I've placed, I just always spec'd 200 psi poly. Direct buried plenty of it, brass barb fittings and all.

 

[Innovate1]

I can't get the culvert 12" deep. It's just a shallow swale so probably only a couple inches coverage. Probably need a steel pipe (not just thin culvert).

200 PSI poly barb fittings? I thought standard for 200 PSI CTS (copper tube size) was compression. I glued in a repair on my 2" pvc line but the original was bell ends with rubber seals and compression on the ends. No issues and about 10 years since the glue repair. Debating if I should glue in a tee or use compression tee.

 

[Innovate1]

A friend in the road business recommended 6" C900 PVC for the culvert. It comes in a couple grades up to nearly 1/2" thick. Said with 8"+ cover I should be fine.

 

[TommyK]

With only 8 inches of cover I would be using ductile iron.