Questions tagged [trench]

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13 votes
8 answers
4k views

How do I place electrical conduit under a creek?

Short version: I need to run 4" PVC electrical conduit under a 4' wide creek where the water is usually 1-4" deep. Code in this area requires cable in conduit to be 18" deep. I do want ...
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  • 448
1 vote
2 answers
68 views

rebar requirements in foundation

follow-up question: I am attaching a diagram with my foundation plan. I am in north NJ where frost line 3 ft. Can you kindly look at the plan and opine; I tried to use best practice from all replies. ...
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6 votes
3 answers
1k views

Does a water-filled trench protect against freezing?

This is a strange question, but I have a trench with a water line (HDPE poly pipe) in it from my new well to my house that I haven't yet buried. There's a cold snap coming where we'll see temps drop ...
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  • 279
0 votes
0 answers
48 views

When do I use 0.3" and 0.5" w.c. drop MDPE Natural Gas pipe sizing tables?

As a disclaimer, I'm working closely with my inspector and I'm going to subcontract my gas plumbing work to a professional - I just like to do my homework first so I know what's going on, what to ...
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  • 249
11 votes
3 answers
3k views

Does it matter if my underground conduit overlaps or crosses over existing conduits?

I'm planning on digging a trench for underground electrical conduit. I recently called my state "call before you dig" underground locating service. They finished marking the locations of ...
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  • 337
7 votes
6 answers
3k views

What do I use for backfilling septic pipe leaving my home?

I have a 4" PVC septic pipe leaving my house on the cinder block wall about 4 feet below my house. There was a crack inside of the part where it leaves the house and I need to replace it (from ...
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  • 77
3 votes
2 answers
542 views

How to backfill trench under slab in Los Angeles

I am converting my music studio, with no utilities, to a studio apartment. With that said I am having to cut the slab to install the sewer. I am in Los Angeles and am wondering what is the correct ...
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  • 39
0 votes
1 answer
222 views

What can I fill my deck beam trench with to prevent standing water?

I am in the process of building a multi level deck where the second level would be low to grade. As such, i had to dig some trenches (about 10-12" deep) as part of the beams will be below grade. ...
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24 votes
16 answers
19k views

How to dig a trench for a cable for a garden office

I'm trying to dig a trench for the electrical cable for a shed/office I'm building in my back garden. This is about 7 m long and should be 0.5 m deep. My soil seems to be about 5 cm of ...
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0 votes
0 answers
55 views

Trenching requirements for utilities in a outdoors kitchen

I would like to build a small outdoors kitchen, with gas (for the grill), electricity, water and drain - sewage (for a sink). I spoke this morning with a person in the building department of my city ...
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0 votes
1 answer
247 views

Keeping Large Channel Trench Drain Clear

My new garage has a large Channel trench drain in front of it. The architect oversized the trench drain and used a non-typical 12-inch drain. I'm confident that I won't get water in my garage. But on ...
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  • 509
2 votes
2 answers
4k views

Appropriate conduit for several data cables underground over 300' run

I have done some searching around but have not found anything definitive, and/or my background is weak in this area and I may be understanding poorly. I will have 2-4 PoE cables that will be run ...
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2 votes
2 answers
3k views

Clarifying separation of ethernet cables from cables running power (underground)

I have seen a few questions regarding how close ethernet cables can be to power cables without a significant impact on the data. For example: Can I run CAT5/6 cables parallel to electrical cables? ...
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2 votes
3 answers
5k views

Easiest way to dig trench along existing fence

My friend cannot currently allow his dogs in his backyard because they dig under his privacy fence. I wanted to fix it for him and just planned on digging a trench (8-10inches deep, 6-8inches wide) ...
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2 votes
0 answers
61 views

Spacing of underground pipes with differing freezing points

I need to run a variety of electrical and plumbing from my house several hundred feet to the site of my future pool and pool shed. Included in this is geothermal piping, connecting my house geothermal ...
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1 vote
1 answer
404 views

Where is electrical trench measured from on slope?

My pool is about 7ft from fence, and i need to dig a trench about 70ft long. About 10ft (will bring pvc at 45 degree angle to fence and out 45 deg to other side of pool) will run along fence and the ...
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  • 1,001
0 votes
0 answers
423 views

Water fills trench outside of home appears to be coming from under foundation

Live in San Diego, CA in an early '70s townhome unit that shares both walls with a front courtyard. Previous owner rerouted the mainline from detached garage above ground (possible slab leak all of ...
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  • 1
1 vote
1 answer
1k views

Trenching up against fence posts

I am planting a small nut orchard. I have about 1500' of fence line enclosing a few acres. So far, I have placed all of the poles for the fencing. These are 12' 6 inch diameter treated wood posts,...
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1 vote
1 answer
60 views

Utility trenches to Accessory Dwelling

I live in Georgia and am putting a garage apartment behind my house. It is about 30 - 40 feet from the main house. I would like to know how many different trenches I will have to dig, how deep, and ...
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1 vote
1 answer
214 views

Drain Help - Cannot Divert to Street

I have a drainage issue in my back yard that we've dealt with for years. I have a few ideas, yet I thought I'd post one to see if it will work first. We live in a typical SoCal track home surrounded ...
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1 vote
2 answers
1k views

How to wrap french drain

I'm putting in a french drain to control runoff and get it out of the yard. The drain is going in an area of the yard that is covered with 1.5" river rock, no dirt will cover the trench at all. I want ...
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  • 11
0 votes
1 answer
756 views

How to run water through winter with bedrock?

Ultimately, we want to have year-round water in a building roughly 300 feet (90m) from our well/house. Where we live the average winter temperature is ~14 farenheit (-10 celsius), and bottoms out ...
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3 votes
1 answer
23k views

Should I rent a trencher, or hire it out?

I need a straight 100', 18" deep trench to run power from my house to a workshop. Though I've never used a trencher before, I'm more than willing to give it a go. That said, when I needed to have a ...
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  • 33
1 vote
1 answer
60 views

I need to Improve drainage in croncrete

I have greyhound kennels. Built them brand new the concreter was a moron and the fall is everyway except towards the drains, I was wondering If it's oossoble to cut a small trench to squeegee water ...
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  • 11
3 votes
5 answers
28k views

How do I dig a 3 foot deep narrow trench in soft clay

I need to dig a 3 foot trench in soft clay to put in a new water pipe. If I use I drain spade to dig it about 16cm ( 6 inches) wide will I have enough space to do the digger? Is there a better ...
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  • 5,913
2 votes
2 answers
3k views

What extra conduit should I include in a utility trench?

I'm putting in a trench with electricity + water + phone from the street to a future house site. The trench will be around 150' long. The electricity and phone will each be in their own conduit, ...
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  • 11.4k
6 votes
3 answers
25k views

Has anyone here ever rented a trencher? What was your experience?

I need to dig a 2 feet deep trench, about 100 feet long. Has anyone used one of these trenchers? The first one in particular? http://rentalsunlimited.com/catalog/trenchers/trenchers.html What was ...
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  • 2,203