I am definitely new to this business, but a friend told me to never turn down work. So I have this customer that wants me to lay down one of these cheap brick/stone patios in this little fenced in condo yard. I have a question for those that have done these. What kind of liner what I put underneath the brick/stone to make sure weeds and such to not grow up through the brick? Also, is there any other generally useful information I might need to know that would of you experienced guys could provide? Thanks in advance.