Hi,

I was set to build custom semi-private fence panels 6' high for a sloping back yard (1 foot down every 6 feet) with PT 4x posts set ~6 feet center with PT 2x4 rails (x3) using cedar panels, but I found a source for cheap composite decking for 0.9$/foot, not sure what brand but it has small grooves the whole way and looks the same front/back. My wife likes it because it is very dark brown color, and the alternative if I don't use the composite will be for me to stain all the wood dark brown on a regular basis (lots of work!!)

I have never heard anyone using composite deck panels for a fence. My concern is warping and the heavy weight of the material, and fastening of the panels to the PT 2x4. Can the composite screws hold onto the boards vertically like this? What is the best way to tie the 2x4's to the posts in this case to accommodate the huge extra weight??

Thanks!!

 

Apparently, you plan to install the decking vertically, the way pickets would look on a stockade fence. Water is going to collect on the top of each board if you don't cut angles. I don't know if that's a good thing.

If the posts are going to be 6' on center, you could buy 12' lengths of decking, cut them in half and install them horizonatally. That would solve the water problem and might eliminate the need for the rails. The posts could even be closer if you think that the weight is still a problem.