×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Waterstop location-inside face or outside?

Waterstop location-inside face or outside?

Waterstop location-inside face or outside?

(OP)
What is the best location for waterstop in a basement wall, inside face or outside face? I like to show the waterstop along the face that has vertical re-bar so that they can tie to it if needed. But if you have re-bar along both faces, what would be the preferred location?

Thanks,

RE: Waterstop location-inside face or outside?

I prefer showing it on the outside face.

RE: Waterstop location-inside face or outside?

Why not in between the the reinforcing?
Also, for a basement you'll probably not get this, but the way you have it shown requires that the top slab bars be lowered to get the wasterstop in. We put in a "starter wall" that's poured with the slab to raise the waterstop. Contractors hate it with a white hot passion, but it is a little better design.

RE: Waterstop location-inside face or outside?

Except for water retaining structures or unusually wet sites, I never use waterstops between wall and footing.

BA

RE: Waterstop location-inside face or outside?

If this a non-yielding basement wall with the rebar at the inside face of the wall, I would place any water stop to the soil side of that.

If this is a yielding wall with the rebar near the soil face, then I would put any water stop inside of that, away from the soil face.

Mike McCann
MMC Engineering

RE: Waterstop location-inside face or outside?

Agree with Jed that using a "kicker" is the best way, to get away from the footing bars, and also to provide a backing for the formwork. This assists in keeping the formwork sealed, avoiding honeycombing. Using a kicker, I like to specify back face waterstops.

RE: Waterstop location-inside face or outside?

Hate to tell you SlideRuleEra, but bentonite is no longer considered that great. It breaks down over time and can start to leak. The modern replacement is chloroprene rubber. It has much better longevity.

We center the waterstop where there are two mats of reinforcing. Tying it against the rebar risks short circuiting the waterstop. Order the waterstop with hog rings and have the contractor demonstrate that they can tie it properly without flopping over. A contractor experienced in using plastic waterstops can pull this of fairly easily.

RE: Waterstop location-inside face or outside?

I use a product called hydrotite which goes straight down the middle between the reo.

RE: Waterstop location-inside face or outside?

Uh-oh... shocked Thanks, Gumpmaster. I'll scratch that recommendation in the future. Good example of how quickly a person (me) can get out of date after retiring.

www.SlideRuleEra.net idea
www.VacuumTubeEra.net r2d2

RE: Waterstop location-inside face or outside?

Be careful to meet the cover requirements if you are using bentonite waterstops. They will break the bottom of the wall.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources