Joining bamboo root barrier

Line up both edges to make sure they have clean cuts:

Before sliding the root barrier in to the trench create a fold on each end:

I find it's easiest to do this over a solid edge, like a table or length of wood:

Flatten this fold to create a crease in the root barrier:

Repeat with the other end - bearing in mind you want the 2 ends to 'hook' together (turn the roll over to make sure the flaps hook together)

Now slide your root barrier in to the trench and 'hook' the two ends together. On one side add a length of timber:

Screw through the the 4 layers of root barrier into the timber baton. This holds the folds of the rhizome barrier closed ready to control the bamboo growth:

It should look something like this:

There are other ways of securing the fold, I have tried to show the easiest way for DIYers, using materials and tools most people would have in the shed. Drilling small holes and using rivets of nuts and bolts with big washers is another secure way to achieve a similar result.