Does Preen work on brick patio?

I've never used Preen before. I just sprayed my whole brick patio (1200 sq ft) with Roundup.
If i sprinkle Preen all over the patio and water it in, will it prevent or at least help prevent future weeds?
Also, I just pulled about a thousand weeds from one area of landscaping on the south side of the house.
The mulch that's there has held up really well from last year, so I only need a light covering of new mulch. Should I mix Preen into the existing mulch, water it in, then put down the new mulch? Or should I put down the new mulch and Preen that?
Dumb questions, I know. I'm so sick of pulling weeds.
Someone buy my house so we can move to Austin.
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On May 31, 1:44 pm, Mitch@_._ wrote:

Put down some landscape fabric under the mulch.
R
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Mitch@_._ wrote:

Preen will work for both of these applications. Remember though ..It does not kill weeds, It stops new weeds from germinating. The effects are not instantaneous and some weeds will continue to grow for a while after your first application. I usually make two light applications about two weeks apart. HTH, EJ in NJ
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Preen will work, but there are even better, more cost effective products that will prevent growth of weeds for 6+ months. Look for them in the lawn/garden center with the herbicide products are sold.
With hardwood mulch, you shouldn't need anything else in those areas. I'm not a big fan of landscape fabric either. It's a pain to deal with when you want to do any additional plantings and it's not particularly effective with mulch either. Dust, debris, and decaying mulch eventually provides a suitable environment for weeds right on top of the fabric and mulch. Periodically renewing the mulch is what you need to do, with or without the fabric.
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Can they be applied right next to your plants like Preen?
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Mitch@_._ wrote:

Preen works on dirt by creating a thin layer that prevents the seeds of weeds from germinating. Those seeds that are under the bricks or beneath flagstones may still be able to germinate - "you pays you money and you takes you chances"
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