Penguin W1608-GP-12 Manuel D'instructions page 59

Suggestions
*
The below mentioned are only suggestions in order to permit drainage, these will vary depending on your
flooring – material, flatness and slope.
flooring – material, flatness and slope.
On the outside face, it is suggested
to drill holes at the bottom end of
the panels to permit drainage when
installing on concrete floor
59
For Concrete
Flooring