From the picture you already have your patio installed.
To implement the polymetric sand solution or the mortar solution requires that you
- Pull up the pavers
- Clean out the sand/dirt between the cracks
- Reinstall the pavers
- Apply polymetric sand/mortar
I've been working on the same issue but I am trying to not pull up the pavers.
- Dirt gets into the cracks between the pavers
- Seeds blow onto the patio and get into the dirt
- Seeds grow and send roots down between the pavers
So, polymetric sand/mortar provides less opportunity for dirt which reduces the chance for seeds to sprout.
Putting weed blocker under the patio fails to address the root cause.
I know I'm going to catch some heat for this but here goes.
I have a large paver patio and I hate pulling weeds so I decided to try salt to prevent weeds. Salt gets down into the cracks and makes an unfavorable environment for seeds to sprout.
- Bought a 20 pound bag of table salt for $7 (not rock salt, table salt is super ground super fine)
- Poured about 3 pounds of it onto the patio
- Used a push broom to work the salt into the cracks. Since it was table salt it is very fine and broomed into the cracks nicely.
- Using my water hose I wetted down the salt so that it washed into the cracks. Not a major hose down, just enough to get the salt wet and further into the cracks.
The patio looked a little salty for a few days. A rain or two brought the patio back to it's normal color.
- Weed free patio all summer
- No salt damage to the pavers
If weeds start to grow again I'll broom in more salt. I'm one year into my experiment - so far, so good.