[DavidandCollette]

Hi. Has anyone had experience of joining sheets of weed suppressant together please?

[Womble]

I've always just given it a good overlap. If you need to join the sheets, how about the double sided tape that they sell for damp proof membrane?  It's not exactly cheap, but I'm sure it would work.

[Louise Gaunt]

I have joined it using the black plastic pegs with fins on the side sold to hold the membrane down. A wooden mallet will drive the peg through both layers, and if you are careful, you can pull the peg out and reuse the membrane if necessary.

[Dan]

We stitched ours together with bailer twine. 

[DavidandCollette]

Another use for baler twine!!