Building construction


SOMDRAIN T5 - Waterproofing and drainage of basement walls

Marquage CE


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 basement walls : 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.

Certification :

SOMDRAIN T5 has been granted a technical certificate by the CSTB.


  • 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


Technical data sheet
Ask for the technical data sheet