CSA S406 is the design standard for PWF foundation in Canada
Clause 7.2.3 states “ Perimeter drainage tile or pipe shall not be used with preserved wood foundations.”
The standard does call for a perimeter French drain and that it shall extend under the footing and be drained to a sump or natural drain, but I cannot understand why perimeter drainage tile is specifically prohibited.
Does anyone know the background and rationale for this clause?
Rick Kitson MBA P.Eng
Construction Project Management
From conception to completion
Clause 7.2.3 states “ Perimeter drainage tile or pipe shall not be used with preserved wood foundations.”
The standard does call for a perimeter French drain and that it shall extend under the footing and be drained to a sump or natural drain, but I cannot understand why perimeter drainage tile is specifically prohibited.
Does anyone know the background and rationale for this clause?
Rick Kitson MBA P.Eng
Construction Project Management
From conception to completion
