How to control weeds growing between pavers?

[ssaw]

Hi team,

There is weed growth between the outdoor bricks—please see the attached photos.

To clean and refresh the area, would the following steps be suitable?

• Apply weed killer to remove the weeds
• Pressure wash the area
• Use polymeric sand ie:  Brunnings Landscape Paver Sand to refill the gaps
• Apply outdoor paints ie: Dulux Weathershield or Taubmans Sunproof to paint/seal the surface

Would these steps help resolve the issue? It seems the gaps between the bricks are getting wider, so I’m thinking something is needed to properly seal them. However, I’m also conscious of whether this might create any drainage issues.

Appreciate your advice—thank you

 

[MitchellMc]

Hi @ssaw,

You're on the right track with your approach, but there are a few things to consider.

Firstly, we don’t typically paint brick pavers that have sand between their joints. If you were to place sand between them and then paint over it, the paint wouldn’t properly adhere. You could potentially paint the pavers first and then add sand, but keep in mind that paver and concrete paints are generally designed for solid surfaces like large concrete slabs or large-format pavers without significant gaps. Additionally, exterior paints like Dulux Weathershield and Taubmans Sunproof aren’t suitable for surfaces that experience foot traffic, so you’d need a specific concrete or paving paint instead.

Using polymeric sand is a good idea as it helps lock the joints and reduces weed growth by preventing water ingress and washout underneath. However, if your pavers are shifting or the gaps are widening, that could indicate an issue with the base underneath. If the bedding material isn’t compacted properly, movement over time can create instability.

As you’ve noted, sealing between the pavers could lead to drainage issues if they don’t have proper fall. If water can’t drain through the gaps, it may pool on the surface, leading to further problems. If you’re concerned about movement and widening gaps, it might be worth checking the stability of the pavers before sealing them. 

If the weed growth is your primary concern, I'd simply kill off what's there, bed in new paving sand between the pavers by brushing and watering it in, and spraying the area every 6 months with a path weeding spray. It sticks around in the sand and stops weeds from emerging.

Please let me know if you have any questions.

Mitchell

[ssaw]

Hi Mitch

Thank you for the detailed advice. It is really helpful

I’m still keen to paint the pavers as part of refreshing the area. I understand there are some challenges, but with the right process and materials, I hope to give it a proper go.

I have a few questions before starting:

• How could I inspect the base and find out the stability issue ?
• Is a primer necessary before painting, and if so, which type would you recommend?
• Should a sealer be applied after painting, or will the paint itself be enough to protect the surface?
• Would painting first and then adding polymeric sand affect the durability of the paint?
• Are there specific brands/products you recommend for the primer, paint, sealer?
• Best tools for this project to ensuring an even finish?

Appreciate your guidance. keen to get it right!

Thanks again!

[MitchellMc]

Hi @ssaw,

Glad you found the advice helpful! 

To check the base stability, try lifting one of the pavers in an area where the gaps are widening. If the bedding underneath is loose, uneven, or has eroded, that’s likely the cause of movement. Ideally, the base should be compacted crushed rock with a layer of sand on top. If you notice gaps or shifting, you may need to re-bed some of the pavers before painting to prevent cracks or damage over time.

For painting, you’ll need a system suitable for masonry, such as the Dulux concrete & paving paint. This is a three-stage system of prep, prime and paint. A sealer isn’t necessary if you’re using a paving paint, as they are formulated to withstand wear.

Be mindful that any movement in the pavers could cause cracking or chipping in the paint over time.

For application, use a long-nap roller for even coverage and a brush for edges. Here's a helpful guide: How to paint a concrete driveway.

Mitchell