×
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

Parging and Tar
2

Parging and Tar

Parging and Tar

(OP)
I don't know if this is the place or the group I should be asking.
But here goes, my problem is the outer wall of my foundation (blocks)is covered with tar. I would like to apply a finish to it. I don't think the tar would be stable enough to hold the parging.
I have been given a number of solutions given by people,mainly doit yourselfers.
Apply directly on top of the tar and hope for the best.
Remove the tar using solvent(?)and scraping.
Fasten a mesh to the foundation and then apply the parging.
Maybe sandblasting will remove it.

Does anyone have any ideas?

Thanx

Pierre

RE: Parging and Tar

2
I wouldn't remove the "tar".  It is there for waterproofing.

You may apply a layer of lath (mesh), fastening with one fastener for every 2 square feet of area, then apply your portland cement plaster (stucco) in at least two layers...the first layer being the one to embed the lath, the second being a finish layer.  Heavily score the first layer to provide a good bond between the first and second layers.

Ideally, a third layer would be applied, but since this is a retro-coat on a foundation block, you can get by with only the second layer.  I would suggest a rough texture finish, as this will hide the finishing flaws if you are not a pro at finishing stucco.

RE: Parging and Tar

How do you properly mix parging?  What is the ratio?  Can I tar over parging?  Can I place Styrofoam SM insulation directly on this tar or does it have to be held on by some mechanical means?  If I want to properly parge a stone wall, after repointing (below grade) do I hammer into it a wire mesh and then put two coats of parging over it then tar then sytrofoam?

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