Yes, you can do this. If they are thin, lay the "doubled" but if they are thicker you can split and put down single thickness. Make sure to overlap. However, you will still get weeds due to wind blowing seed through the air and landing in the area. But this will help to cut down quite a bit.
Hi M yes plastic would work as a barrier, I would put mulch (or something) over them though both to hide them and hold them down.
Plastic, sheets or wet layers of newspaper.
Yes that would work
They should work although they are kind of thin. The heavy duty bags would be better.
They can, but if they are to be used in a flower bed they won’t be able to get any rain water.
it is best to buy weed block at your local home depot, etc so it doesn't smother the plants but kills weeds https://www.gardenloversclub.com/reviews/weed-control/best-weed-barriers/
They could be used as weed block. If you wanted to be more eco-friendly, I'd use layers of newspapers.
You can also put down a combination of cardboard (pizza boxes and other boxes), wet the boxes and newspaper, and then cover with mulch. This video will show you how: https://www.youtube.com/watch?v=VdXQ2ljEijA
Ive done it before. I also used old black cotton sheets
Yes i have done it before
They might degrade or cause mild flooding/pooling issues since water can’t permeate. You might be better off with cardboard, newspaper, or a commercial weed fabric.
Hello you could but the consequences might not be favorable or worthwhile. I have had good luck with cardboard, I suggest it would be a better alternative.
Yes, but I think they'd be best in small areas since the weeds will find a way in between bags.