Basement Addition - Drain Tile Pipe Size

[Bolson32]

Hey Guys,

We're breaking ground on a 24x32 addition over a full basement that I'm GCing and doing some of the work for on my own. The budget is pretty tight with the HELOC we have to work with for the next year or so, so I'm looking to be frugal where I can be. That said, we are adding to the side of the house that has had basement water issues previously, and I'm taking a bit of a belt and suspenders approach to the waterproofing already. I'm already planning on asphalt sealing/priming the poured walls and covering with a 60mil waterproofing membrane, adding 2" of XPS followed by a dimple board/drainage mat down to a drain tile burrito of geotextile and rock around a perforated pipe.

My question is, can I get away with 3" pipe? And also drain pipe not sch40. It seems to be what Standard Water(basement waterproofing company) uses in their drain tile and it's over twice as cheap, 4" sch40 is 4x the price of 3" sewer and drain pipe. Socked, corrugated pipe is also cheaper yet, but it seems like rigid pipe is the preferred approach these days.

Any tips would be greatly appreciated!

 

[The Cobbler]

4" socked drain tile is what's commonly used here. 3" isn't that much cheaper .
lots of clear stone and Delta Wrap is what I would do , and 4" sock drain tile . not a place to cheap out, in my opinion

 

[Bolson32]

4" socked drain tile is what's commonly used here. 3" isn't that much cheaper .
lots of clear stone and Delta Wrap is what I would do , and 4" sock drain tile . not a place to cheap out, in my opinion

4" Socked pipe is actually cheaper than 3" rigid PVC. I think the concern with corrugated is that the holes and sock tend to fill up and clog with minerals. Whereas rigid PVC has larger holes and is more free-flowing.

 

[mike93lx]

Corrugated is garbage. It's only benefits are that it is light and can be coiled up for transport.

I will never use it for drainage

I do use S&D where there is no risk of damage. For solid pipe, foam core 4" isn't a lot more expensive when buying in a decent quantity, in my experience, but the fittings cost a lot more

 

[Bolson32]

I dont see Menards selling foam core, this appears to be what I was planning on using.

4" x 10' Perforated PVC Sewer and Drain Pipe ASTM D2729

This 4" x 10' ASTM D2729 perforated pipe is for gravity sewer systems.

www.menards.com

Where else can I look for it?

 

[mike93lx]

I've bought it at HD and Lowes. Plumbing supply house may also have it.

One other nice thing about S&D is that it is bell end, so no couplings are needed

Pipe in any downspouts at the same time, too.

 

[jkuro]

Put in both inner and outer drain tile. For the outer tile , backfill with gravel to within a foot of grade.

 

[Bolson32]

Is foam core stronger than solid core?

 

[mike93lx]

Is foam core stronger than solid core?

No, it's lighter and cheaper, though.

Foam core sched 40 is stronger than S&D by a long shot, though. Just a matter if that is needed in your application.

Both are lightyears better than corrugated

 

[larry4406]

All our new homes have 2” weep holes in the footings every 6-8’. We use 4” corrugated draintile in a bed of 4” stone (#57) and 4” cover of same stone. This is then covered with filter fabric.

Our foundations are hot spray tar GMX waterproofed, not damp proofing.

A foundation is no place to be frugal. It all starts here right or wrong.