Building construction


SOMDRAIN T5 - Waterproofing and drainage of basement walls


When building structures, it is important to protect the foundations by preventing water from accumulating against the walls and by facilitating its discharge. A drainage system, combined with a waterproofing solution, is recommended.

SOMDRAIN® T5 is applied vertically in contact with the walls of the basement structure : residential, business or industrial premises. It simultaneously protects and seals the wall on which it rests while draining run-off water. This water is discharged into a collector drain at the bottom of the structure.

This product has been used for more than 25 years and 2 million m2 have been installed worldwide.


  • 4 basic functions in just one operation : mechanical protection, filtration, drainage and waterproofing
  • Does not require a waterproofer for its implementation
  • Waterproofing linked to its mechanical protection
  • Very flexible, light product, making installation easier in corners
  • No drying time
  • Quickly installed
  • Cost-effective and environmentally friendly solution which avoids the use of drainage materials at the bottom
  • No need for a blowtorch or heavy-duty tools


Drainage Drainage
Filtration Filtration
Mechanical protection Mechanical protection
Waterproofing Waterproofing


  • 5/10 mm PVC waterproofing membrane. Filtering and draining geotextiles made of polypropylene.
  • Roll surface area : 40 m2
  • Roll width : 1.95 m
  • Roll weight : 60 kg
  • Maximum construction height : 6 m
  • Output : 80 m2 installed per day by two people