×
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

Damp Rising in Old Buildings

Damp Rising in Old Buildings

Damp Rising in Old Buildings

(OP)
I am looking for  technical information/experience  to share on how to tackle damp rising in old historic buildings. Construction of walls in stones  held together with mud and lime mixed mortar. During rainy periods water table is almost above foundation level.

Existing building has neither damp proof membrane in the floor  nor damp proof course in the walls. The building is a 2 storey structure about 80 years old.

I have used a combination of French drain to lower the water table and applied a low viscosity epoxy pressure injection resin (Sika Product) to the walls for forming  a barrier against infiltration of ground water. The mortar for plastering walls had waterproofing admixture. The plastered walls were than treated with a water dispersed epoxy resin coating. The ground floor slab was touched with new screed having a waterproofing admixture. This has helped considerably.

RE: Damp Rising in Old Buildings

Riz,
Sounds like you've done about all one could reasonably do with this.  If you have no limitations on floor slab penetrations, you could inject a barrier under the floor slab, depending upon soil conditions, that would impede the upward rise.  A silicate gel would typically be used for this.  Another approach for the floor slab would be to let moisture come through and dehumidify mechanically.

Be sure that you do not install a barrier covering on the floor as blistering is likely.

There are a couple of companies in the US that have created cementitious barrier overlays for prevention of vapor migration in floor slabs.  They typically offer a 10 year warranty on them.  You might consider this approach if you intend to place tile or other barrier coverings on the floor.  One of the companies is "Floor Seal Technologies", but I can't recall the name of the other.

Good luck.

Ron

RE: Damp Rising in Old Buildings

There are some companies who manufacture special ceramic inserts for providing damp proofing in old buildings. I can't remember their names, but you might find on the internet. As far as I recall, you drill holes in the walls at recommended intervals and insert the ceramic. If I find any more info I'll let you know.

Regards,

david.

RE: Damp Rising in Old Buildings

As I understand it you've treated the INSIDES ONLY of the walls, which is fine. I would add that the mortar joints throughout might need replacement in order to prevent some continuing damp damage and in order to give you a better final result than leaving the old lime mortar in place, would provide better external protection and structural integrity.

I've done a couple of jobs like this (lived in one of them) and it can be done piece by piece by a good mason; it can also provide a substantial improvement in appearance, colour, texture etc. On no account would you waterproof the external wall face as well.

You seem to have already done a good job. Hope this may help as well.


Anthony Tugwell
Project Director & Consulting Engineer - just relocated to Australia

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! Already a Member? Login



Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close