the absolutley best way....

[cruzn57]

to seal a new construction basement.
not huge, maybe 12x20...
probably cinder block, dirt back fill on 3 sides,
membrane? tar?
I want no problems 20 yrs down the road,

in the dreaming stage now, but it will include a BIGGER garage!

basement will be safe room/ not public/ cool in the summer room!

 

[Chris]

Will you have access to the outside of walls after built or only before stacking block? Had this conversation last night with a buddy.

 

[cruzn57]

meaning, will have access to exterior, as excavating to pour footing,
will back fill after walls are built, and sealed.

 

[Chris]

On commercial work we use the tar and then the membrane and also do a drain pipe at the bottom of the wall wrapped in gravel to divert any moisture out of the area, not sure if you will need that where you are.To me the little extra cost to do both would be worth it for peace of mind that it is done right.

 

[havasu]

I've only seen it on DIY shows. I like when they throw the 2" hard foam insulation, then the membrane and tar over it all. That seems like a great water retention and insulation idea.

 

[Chris]

I think tar should go first to soak into the block then the membrane and insulation if you think you need it.

I will be going through this fairly soon when I do my room addition.

 

[cruzn57]

thanks
I've seen the "TV" method, but wonder if thats "sponsored"
spray on tar? I'd guess,
then the rubber membrane, what seals the membrane to each other?
some sort of rubber glue?
had block basement back east, and had seepage, always smelled wet.

 

[Rusty]

When I worked construction, many years ago, we rolled tar on the outside and then backfilled after it dried. It was fun in 100+ temps.