cheep waterproof membrane for wall

[hunggaur]

hi folks i am building a workshop in the back garden. One of the wall which is 6.5m long will but up against a 2 meter high garden wall which made from gabion baskets which support the lawn.

my concern is that water from the wall will drain through the gabion wall and then i will get damp on the inside wall of the workshop.

the gabions are already in place so anything i do to the out side of the workshop wall will have to be done while it is built as i will not have any room to get behind the wall at a later date.

i have been looking at dimple waterproof basement membranes as these could be put in place while the workshop is being built.

does anyone know where i can get some from cheap as i only need about 6.5 meters of 2 meter high but all the 2 meter ones i can find come in 30 or 50 meters roles. cheers jon

other ideas welcomed

cheers

jon

 

[catlad]

I am building something similar next summer and I am going to use box profile roofing sheets cut to size due to limited access when finished.