[lee12]

Building an addition with full basement and would be interested to get some feedback about the foundation drainage system. Here is what is planned.

http://i566.photobucket.com/albums/s...2/drainage.jpg

It is an 8" masonry construction for a general use basement (not finished). The drain pipe will tie into the current drain pipe around the existing house (I assume this drains to daylight somewhere, I do not have a sump system). Pipe will be at least 6" below the top of basement slab. Clay type soil. The drainage stone quoted for the job is 2B modified but this could be changed. Really appreciate any comments, thanks.

[speedball1]

Before you connect into the house drain, (I hope you don't have a septic tank) check with your local Building Department.
In my area it's against the law to connect anything but gray water and sewage to a city sewer.
If you need options, other then the city sewer, click on back or you can reach me faster if you post onn the plumbing page. If you wish I can move this thread over there. Your pleasure, Tom

[lee12]

Thanks Tom. I may not have made it clear, but I won't be connecting to any sewer/septic lines (I have septic). What I will be doing is tying into the current foundation drain that runs all the way around the footing of the existing house.

[hkstroud]

Sounds good to me, with the comment.

Wrap drainage pipe in nylon fabric,
Wrap gravel in nylon fabric.

This will help to keep the sand and sediment out. Otherwise pipe and gravel will fill up with sand and sediment in about 20 years.

[lee12]

Thanks for the tips

[speedball1]

And thank you Lee, for the update. I was going to suggest french drains plus dry wells but you seemto have the situation well in hand. Good luck, Tom