Would you??

[no704]

Build over existing three inch ABS sewer line? Looking to build a shop in my backyard. Location of the existing line limits how large I can build without going on top of it. In Tempe Az. Sewer is not deep maybe 2 1/2-3 feet. I believe footers should be 18”. My gut and plumber friend tell me it’s a bad idea. Other friend that was a builder for a time says build over it no problem. I just finished having the main replaced under the ally and finally have no sewer problems, and don’t want any!
Thanks.

 

[PCustoms]

Throw a spare section of 4" or 6" pipe under in case you need to run something later?

 

[nmk_61802]

Just make sure no footers land over or within 45 degree cone below. Slab on grade houses are built on top of waste plumbing all the time.

 

[azmodela]

That doesn't align with AZ state laws, unless it's just a sewer line going from a fixture in your house to the main line. In AZ, all sewer main line connections (not individual fixture lines, but the one they all drain to) is supposed to be 4" in diameter and buried 4 feet deep.

I wouldn't be worried about building over it, after all the slab of your house was poured around the sewer lines in your house. Weight shouldn't be an issue if its properly buried at 4 or more feet.

 

[The Cobbler]

I don't see any issues, other than if it ever needs to be dug up... then, do you have the space to go around the building with a new sewer ?

 

[WildBill]

My house sewer line goes under one corner of my shop, pretty sure its done all the time.

 

[no704]

That doesn't align with AZ state laws, unless it's just a sewer line going from a fixture in your house to the main line. In AZ, all sewer main line connections (not individual fixture lines, but the one they all drain to) is supposed to be 4" in diameter and buried 4 feet deep.

I wouldn't be worried about building over it, after all the slab of your house was poured around the sewer lines in your house. Weight shouldn't be an issue if its properly buried at 4 or more feet.

House was built in 1962. Replaced the orngeburg that was there with ABS. It is definitely less than 4 feet deep.it is the main line out to the city sewer that runs under the ally.

 

[no704]

Just make sure no footers land over or within 45 degree cone below. Slab on grade houses are built on top of waste plumbing all the time.

I think I’m understanding this. But if I build over it won’t this have to be the case? Or are you saying build over it and don’t have footings in that span?

 

[nmk_61802]

I think I’m understanding this. But if I build over it won’t this have to be the case? Or are you saying build over it and don’t have footings in that span?

Your initial post said “footers”, I had assumed steel, or post building with thickened footers at post/ column locations (right or wrong).


If using a continuous perimeter footing and the line will pass thru it sleeve it with a larger pipe. If it passes under, as long as the foundation is built properly, the effect on the pipe will be minimal. The foundation can be excavated under for that small area if repair is needed.

 

[no704]

Footer all the way around. Will be block walls. Diagonal line is the sewer line This is my current plan To get any larger I would have to build over the sewer, I’m still leaning toward not

 

[PCustoms]

Footer all the way around. Will be block walls. Diagonal line is the sewer line This is my current plan To get any larger I would have to build over the sewer, I’m still leaning toward not

Any larger is going to overpower that lot IMHO.

Aren't you already encroaching on the setback though?

 

[larry4406]

We build townhouse units buried basement with one side walkout at garage side (opposite side).

Sewers run under driveway whole length 25’+.

Bed sewer in properly with proper grade.

 

[no704]

Any larger is going to overpower that lot IMHO.

Aren't you already encroaching on the setback though?

Yes I’m already into the setback. Going to need a variance on that. On the ally side I don’t think it’s a problem as several homes in the neighborhood are set up like this to the ally. On the west side, I want to say I can’t move further east due to the sewer and overhead electrical. I’d like to say it’s no longer a residential street since they started running citi busses on it 6am till 10pm.

 

[PCustoms]

Yes I’m already into the setback. Going to need a variance on that. On the ally side I don’t think it’s a problem as several homes in the neighborhood are set up like this to the ally. On the west side, I want to say I can’t move further east due to the sewer and overhead electrical. I’d like to say it’s no longer a residential street since they started running citi busses on it 6am till 10pm.

What are you restrictions on height?

A 17' garage is going to stand out behind a 13' house...

 

[no704]

Ya i know

What are you restrictions on height?

A 17' garage is going to stand out behind a 13' house...

I relise that. Really want at least a 12’ ceiling in the shop got a car lift. So they can talk me down a bit. Not set on a roof system yet.

 

[bdbecker]

If you are worried that it might make future repairs difficult, would it be possible to re-route the line through the yard prior to construction of the shop?

 

[no704]

If you are worried that it might make future repairs difficult, would it be possible to re-route the line through the yard prior to construction of the shop?

Possible, yes. Practical, no.

 

[Bert_]

If you are worried that it might make future repairs difficult, would it be possible to re-route the line through the yard prior to construction of the shop?

My thought on that is you could redo it now or reroute it if there is ever a problem. Good chance there will never be a problem.

 

[no704]

My thought on that is you could redo it now or reroute it if there is ever a problem. Good chance there will never be a problem.

Probably true, but just recovering from orngeburg nightmare, I’m a bit gunshy!