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How to stop weeds coming through your decking

Read our guide on how to stop weeds coming through your decking. A deck is a great place to relax with family and friends. But weeds coming through your decking will drive you nuts.
So, how can you avoid getting weeds under your deck and losing your cool in the summer? All you need to do is a bit of planning.

5 tips on how to stop weeds coming through your decking

  1. Remove the grass. If your decking hasn’t been laid yet, remove or kill the grass in the area that it will go on. By doing so, weeds are less likely to become established and spread. Also, you’re less likely to have grass growing through your decking.
  1. Put down weed control fabric. Once you’ve removed the grass, the next step is to put down a layer of good-quality weed control fabric, such as Weedtex or Groundtex. It’s important to cover every inch of the ground where your deck will go. Leave a gap and it’s an open invitation to weeds to grow.
  1. Add an extra layer of protection. Once the weed control fabric is down and secured with landscaping pegs, the next step is to cover it with mulch or gravel. Put a good, thick layer down – both help keep the light out and suppress weeds and anything else that might grow.
  1. Wield the weed killer. Of course you might inherit a weed problem or not discover it until your deck is down. If this is the case, it’s worth getting the wield killer out and thoroughly treating the problem area. You will have to be persistent and it might take a while, but it could do the trick.
  1. Be vigilant. Whether you’re tackling the problems of weeds coming through your decking before or after installation, it always pays to keep an eye out for any weed growth and spend some time on a bit of maintenance around and below your decking if possible. Get to the weeds early!

Another tip for anyone dealing with weeds already growing through decking is to get the decking taken up. It might not be possible and it is a much bigger project, but once the decking is up, you can follow the first steps above and tackle the problem much more efficiently. If this isn’t an option, check out our top 5 tips for effective weed control.

Overall, it’s worth remembering that weeds can be maddeningly persistent and even the most thorough planning can sometimes come up short. But the more you do and the more you invest, the better the results will be.

We hope that the guide has given you ideas of  how to stop weeds coming through your decking.

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Latest News

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Knight fencing installed a field gate for me, great service at a sensible price, would definitely use again. Recommended
Cassie H.
Knight fencing team arrived on time and well presented. They were very friendly and only too happy to discuss what was to be done and they made sure that we were happy. They worked well and repaired our fence and installed a support pole for a large tree. They were quick and very tidy and even sharpened my garden shears that were blunt. I would definitely recommend this company for any garden repair work.
Paul T.
Terry in Plymouth did a great job installing my 7m fence in difficult terrain,will use again soon,thank you Paul..
Rik N.
Alex and Jason did a great job for us. Very pleased with the result. They also dealt with attention from the neighbours very diplomatically. Would deffo deal again !
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First rate job in our boundary fence installed in awful weather yet care taken to ensure all levels are correct!
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Absolutely delighted with this fencing installation. Most professional team came in and made a perfect job. My garden is now transformed! Many thanks to this superb company.
Malcolm B.
In June 2025 excellent fitters Kevin and George from Knight installed these well made Iroko double gates.
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I had delivery of my gorgeous garden swing this morning. How nice to be taken by surprise that Knight Fencing really delIvered on it's promise! Recent experience has shown me that not all companies do this. Since placing my order, Jade in customer services has been fab, and I also must mention how accommodating and friendly Knight Fencing's delivery partners, F&G Transport were - they couldn't have been more helpful. These are most definitely companies you can trust!! A very satisfied customer!!
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Great and efficient response to a post that needed replacing. Thank you Terry.

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Trusted, Accredited, and Committed to Excellence

Association of Fencing-Industries
DuraPost Trained Installer
SMAS Worksafe preferred supplier
Postsaver Approved Installer
AJS Training
Constructionline Gold Member
CLD approved installer
Checkatrade.com members
CHAS accreditation advanced
Alexandra recommened installer

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News, Tips and Advice

  • Women in Construction: Celebrating the Team at Knight Fencing
    Women in Construction: Celebrating the Team at Knight FencingMarch 11, 2026 - 3:49 pm
  • Knight Fencing team member working in waterlogged, muddy ground conditions during a winter timber fencing installation
    Professional Fencing Installation West SussexFebruary 27, 2026 - 1:01 pm
  • Before and after of a free timber gate installation for a local resident by Knight Fencing Ltd
    Community Support ChichesterFebruary 24, 2026 - 12:59 pm
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Knight Fencing
4.9
Based on 72 reviews