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Influence of cracks on moisture conditions in façades with water-repellent treatments

Sandin, Kenneth LU (1999) In International Journal for Restoration 5(5). p.499-521
Abstract
A water-repellent treatment normally works well if there are no cracks in the façade. The occurrence of cracks, however, may allow water to penetrate, resulting in significant moisture. How wide a crack may be tolerated is not known. A limit of 0,3 mm is often allowed. To illuminate this question and create a better basis for evaluating an acceptable width for a crack, this paper will present both a theoretical review and laboratory studies. A simple method for testing the effectiveness of the various treatments will be reviewed. Results from laboratory studies indicate that the practical contact angle is less than has usually been assumed. For most treaments this angle was 110 degrees - 120 degrees. In practical terms the acceptable width... (More)
A water-repellent treatment normally works well if there are no cracks in the façade. The occurrence of cracks, however, may allow water to penetrate, resulting in significant moisture. How wide a crack may be tolerated is not known. A limit of 0,3 mm is often allowed. To illuminate this question and create a better basis for evaluating an acceptable width for a crack, this paper will present both a theoretical review and laboratory studies. A simple method for testing the effectiveness of the various treatments will be reviewed. Results from laboratory studies indicate that the practical contact angle is less than has usually been assumed. For most treaments this angle was 110 degrees - 120 degrees. In practical terms the acceptable width of a crack will be dependent upon exposure to wind and driving rain as well as wall construction. In areas of heavy wind and rain exposure, 0,1 mm would seem to be the maximum acceptable width for most treatment compounds. In less exposed locations, however, a crack witdh of 0,3mm is often acceptable. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Building, Façade, Exterior, Crack, Humidity, Insulation, Hydrophobization, Test, Analysis
in
International Journal for Restoration
volume
5
issue
5
pages
499 - 521
ISSN
0947-4498
language
English
LU publication?
yes
id
e5b6c019-d511-401b-b608-38d340bc8b91 (old id 1496852)
date added to LUP
2009-10-28 09:28:19
date last changed
2016-04-16 06:39:08
@article{e5b6c019-d511-401b-b608-38d340bc8b91,
  abstract     = {A water-repellent treatment normally works well if there are no cracks in the façade. The occurrence of cracks, however, may allow water to penetrate, resulting in significant moisture. How wide a crack may be tolerated is not known. A limit of 0,3 mm is often allowed. To illuminate this question and create a better basis for evaluating an acceptable width for a crack, this paper will present both a theoretical review and laboratory studies. A simple method for testing the effectiveness of the various treatments will be reviewed. Results from laboratory studies indicate that the practical contact angle is less than has usually been assumed. For most treaments this angle was 110 degrees - 120 degrees. In practical terms the acceptable width of a crack will be dependent upon exposure to wind and driving rain as well as wall construction. In areas of heavy wind and rain exposure, 0,1 mm would seem to be the maximum acceptable width for most treatment compounds. In less exposed locations, however, a crack witdh of 0,3mm is often acceptable.},
  author       = {Sandin, Kenneth},
  issn         = {0947-4498},
  keyword      = {Building,Façade,Exterior,Crack,Humidity,Insulation,Hydrophobization,Test,Analysis},
  language     = {eng},
  number       = {5},
  pages        = {499--521},
  series       = {International Journal for Restoration},
  title        = {Influence of cracks on moisture conditions in façades with water-repellent treatments},
  volume       = {5},
  year         = {1999},
}