Sorry for the very late reply, but I thought I would respond just in case it could be of use. I can't remember exactly, but I think there is kerf on the top rail that the mesh slides into. On the sides I think they drilled for the horizontal members of the mesh and on the bottom rail, I think it sandwiched between two members so rainwater does not sit on top of the wood.
pwg architecture
Related Discussions
"need to design space under the staircase"
Q
Your suggestions to look front end of the proposed house arttistic
Q
Need help with my living room's renovation
Q
How to utilize area under this staircase?
Q