Weed blocker under pea gravel

landscape weed blocker?

Plastic if you don't care about drainage.

I have the black "paper" under mine. It's like a woven sheet. Seems like it keeps most stuff out. But coco grass pops through it. Never thought about shingles. I would try that.

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There's nothing you can do to permanently prevent weeds. They will find your smallest amounts of dirt in your gravel to grow and don't need much depth, so if you have say 1/2" of gravel and then a weed barrier you'll get weeds above your barrier.

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I've experienced this after spending the extra time and money to make sure all grass was eliminated and put down several layers of hardscape barrier. Weeds nor grass grow thru the barrier, but they do pop up on the surface of the gravel. Easy enough to pull up but I have a small area.

I've switched to spreading salt and watering it in. I've done it twice this year and nothing has been growing. Not sure if it's ever a permanent solution but it's cheaper/easier/more effective for me so far compared to spraying Kill All.