The Problems with Composite Decking

By Scott Sidler • April 23, 2018

the problems with composite deckingThere are a lot of options for decking today. It’s not like the old days where you had to simply choose between different species of wood. Today, there are still all of the wood options of yesterday, but now there are scores of different composite decking options.

If you been a reader of my blog for any amount of time, you’re probably thinking “Oh now, here he goes again bemoaning another modern product.” Well, I want to tell you that that is not the case. I don’t have problems with new products, only subpar ones.

Sadly, most composite decking falls into that category. It has been improving slowly over the years with the introduction of capped products and other upgrades, but still, the reports from consumers and contractors are not promising. Take a look at some of the websites where homeowners have posted their reviews, and you’ll read 1 and 2 star reviews all day long.

The Problems With Composite Decking

There are a multitude of problems with composite decking that show up all too often to be just a stray issue for a hard to please homeowner. The accounts of issues are repeated with a frightening regularity and sameness throughout the threads of complaints. Below are some of the issues that crop up most often.



Especially prevalent on older and uncapped composited decking, mold shows up quickly and is more difficult to eradicate than you’d expect. The mold seems to grow heavily not just on the surface, but inside the rough texture of uncapped decking. It seems to come on strong and takes constant effort to keep the decking clear of it, especially for a self-proclaimed “no maintenance” product.

Color Fading

Everybody knows color fades in the sun, but composite decking companies seem to be oblivious to what their products are really capable of. Some composite decking has faded so quickly in just a couple of seasons that replacements boards stand out like a sore thumb. Just like the mold, this issue is unpredictable and hard to understand which decking will have problems and which will not.

Warping & Shrinking

It’s not wood, so it shouldn’t be expanding and moving the same, right? Right! It actually moves more AND more unexpectedly than wood decks. Some composite decking won’t move a bit and others have been found to shrink, swell, warp, twist, bow, and any other word you want to use in amounts unheard of, even with wood. Again, it seems completely random when this happens, but it happens often enough that you should know about it.


This one has been the issue that I encounter most- composite decking boards that feel like a trampoline when you walk on them. They have gotten so spongey that they sag from one board to the next making your decking like a mini rollercoaster. I notice this issue showing up after a decade or more of use, but it certainly shows up and when it does it usually makes the deck unusable. Check out the video below to see how springy these boards can really get!

What To Do?

For now, I’d say the best way to avoid problems with composite decking are to avoid it altogether and stick with wood. You may be one of the lucky ones who installs composite decking and gets away with it, or you may end up constantly on the phone trying to persuade them into the honoring their warranty, which is extremely hard to do.

Sure, wood has issues of its own, but it’s nothing that will take me by surprise. And if it needs a replacement piece, it’s as easy as swinging by the local lumber yard rather than trying to track down a model that has been discontinued 2 years ago from a supplier halfway across the country. As for me, I’m sticking with wood. How about you?

Composite decking has come a long way since it first came out, but it’s not there yet. Someday, the industry may be able to create a consistent long-lasting product that lives up to the claims, but right now, they can’t seem to make it work. When they can make a product that is consistently better than wood, then I’ll be in line for it, but until then I’m sticking with a reliable option like wood. How about you?

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47 thoughts on “The Problems with Composite Decking”

  1. Like Laurie, our experience with Trex has been good. I’m not sure what level of Trex we have – likely Select – but we’ve had it for about 10 years now. No problem with warping or fading. The deck was poorly built, without enough space between slats to drain water, so water collects on it and it gets dirty and mossy, but power-washing cleans it well.

  2. Hey, how do you think about the material which is100% plastic lumber? Is it better than composite lumber? Or any experience you can share to me? Thank you very much!

  3. I’ve been installing Trex since 2007, I’d heard of issues but never experienced any. Went to see a couple of examples and clearly the installation was a DIY error which I helped remedy. This last August and early September I installed a trex deck for some dear friends. Then I went on vacation and came back to finish it. In mid October it rained and then November it froze. The ends of the trex began to swell up at the butt joints,, never seen that before. Yesterday I examined the deck and the butt joints have swollen more. I’ve contacted both Trex and Home Depot. They are looking for fine line reasons to NOT honor their product. Trex says that because I used unapproved fasteners that they caused excessive moisture build up which caused the swelling. I’ve seen trex under 2 feet of snow and used as a dock surface over water. This is a defective produce and no one wants to be responsible. Home Depot is saying that because they didn’t install it that they are not responsible. I believe that the Trex rep is reading from a script designed to disparage my installation and find any reason possible to NOT honor their warranty. I’ve searched the internet and can’t find another example of expanding ends when there is plenty of space between the boards at the butt joint. I also have pics of a DIY job where the butt joints were installed tight with no gap and the boards did not swell up. There is moss growing between the boards in many places and the boards did not swell.. If anyone else is having this issue please contact me..

    Thanks, Bill

    1. Hey Bill, I installed a Trex deck 8 yrs ago and it seems like it is falling apart. It’s spongy and mushy and looks like it is going to fall to pieces within a year. I paid $30,000 to have it installed. I do not know where to go to try and get my money back. All I can think of is take a picture of it and put it on the internet to warn people not to buy this product and stick to real wood decks!!

  4. We are going to build a deck on the North side of our house. Our contractor says that we can use Trex decking for the floor but that we should use redwood with sicken for the railings. He said that in his experience the Trex railings have warped. The north side of our house does not get really intense sun but I am concerned about mold because the deck is shaded for a long portion of the year. What is your experience with railings warping and mold in these conditions?

  5. Woodbridge, VA, 26 October 2018.
    In the last month I have been working with a contractor on plans for a small porch to be built over my townhouse front stoop, using Trex Transcend, Island Mist or Vintage Lantern, for ease of maintenance. Are there still longevity/performance issues with the product?

    1. Hello, I live in the Pacific Northwest (Idaho). My house is situated in a damp location next to a creek. Winters here are a bit harsh as well. We put rhino composite decking on about twelve years ago and haven’t regretted that decision. While it has faded a bit and had a little moss from time to time, a quick power washing cleans it up nicely. It looks great and there are no splinters or sanding/refinishing.

  6. Need to replace a small 13 x 7 ft deck over dirt in a kind of atrium patio that is completely enclosed on all four sides, gets hardly any moving air and is very hot 10 months out of the year (Houston, TX) but little direct sun on the surface. Installed a wooden deck seven years ago and it is completely soggy and rotten (also due to Harvey hurricane).
    One contractor suggested Trex, one suggested brick looking 12×12 pavers. Any comments on what would be best.

    1. Hi Tina!

      We live in an area that gets a ton of moisture too (Orlando, FL)
      Our best and safest recommendation is to use our directory to find a licensed preservationist in your area who can provide an accurate recommendation upon seeing it in person.
      Good luck!
      -Alyssa at The Craftsman Blog

  7. Thanks for this brilliant information. I have 55 degree days in summer and minus in the winter. The foot burning problems with composite decking sounds exactly what’s happening with the artificial turf that’s being laid in the city gardens. So-called low maintenance, but can’t be walked on on a sunny day. Will go with real timber – I’d rather oil once a year than use harsh mold-busting chemicals that damage the environment and garden. Mould is a significant health risk as well. Once it’s there, you never can get rid of it.

  8. We looked at a wide range of plastic/composite decking, and one issue that was a problem for us was damage. If you use your deck, sooner of later you will scuff it, scrape it, or drop something sharp on it. The advice from the deck companies? Use a hair dryer or heat gun on it to soften it up and try to ‘weld’ it back together.. Ridiculous. With wood, I can sand and reapply the finish and be done. To top all that off, there’s cost. The stuff is more expensive than a high-quality wood! We wound up going with Cumaru, which requires little maintenance (coat of oil every other year) and actually was more cost effective per linear foot.

  9. We had a good local carpenter put a new porch/deck on our seasonal house in Nova Scotia. I asked about a synthetic surface and he told me it would get very hot, as that entry faces southeast and has sun on it most of the day. We went with pressure treated southern yellow pine which is probably not ideal in terms of old house purity but it certainly works, and does not get too hot on a 90 degree day.

    A friend 1/4 mile up the road insisted on a synthetic surface on his new deck. And has found it too hot on days with a lot of sun.

    1. Hi Noel,
      That’s a common complaint we hear from people that have gone with synthetic/composite decking- way too hot for anyone’s feet, especially down here where we are located in Florida.
      Thanks so much for reading and commenting!
      -Alyssa at The Craftsman Blog

  10. I live in the Rocky Mnt’s where the weather gets extreme. We’re getting ready to replace our wood wrap around decking with Compostie or Vinyl wrap (contractor suggested vinyl). But with NO knowledge of either I’m reaching out for information. I’ve been reading about Is anyone familiar with this one or have suggestions? We are retiring and really don’t want the hassle of maintaining a wooden deck anymore. TIA

  11. We used the mid-level Fiberon (Flagstaff) with the lifetime guarantee. The underpinnings of the deck were no more than 16″ apart and it was installed properly with space between the board ends. In less than 6 months, the boards warped. I contacted Fiberon and they wanted details. I sent them (pictures, specs, etc) and they have not replied. Good thing I purchased with AMEX. I am going to make them replace it or refund me for the cost of the product as it was not cheap! #hellhathnofury

  12. I agree that there is much less appeal these days with composites especially here with bay area decking. Although the composite decks are less maintenance initially the problems are abundant sand customer service from the largest suppliers is quite poor. I am a deck builder of 20+ years and i have certainly seen the shift back towards wood even the quality of wood is also being challenged

          1. Hi Cindi,
            The climate is different than here in Florida, but still damp like it is here. Our best recommendation would be to use this directory to find a licensed preservationist in your area who has in-person expertise with that specific climate.
            Best of luck to you!
            -Alyssa at The Craftsman Blog

    1. We have a trex deck that we are adding a small piece to at a cabin. We have the boards cut and sitting flat on the deck waiting for us to return and install and screw down. Do you think the boards will warp in the hot sun 95 to 100 degrees if they aren’t installed in the next 3 weeks?

      1. I don’t know about warping (though I’ve read a lot of comments about warping etc) but we moved into a house this week with Tex Transcend. The outside temp is 85 degrees and in the sun the deck get’s so hot we won’t even go near it in the heat. I burned the crap out of my feet in about 20 seconds. I’m terrified my dogs will get out there during the day and get hurt.

  13. We had a new dock built with azak last September. It is so bad with dirt/ mold stains that won’t even come off with a pressure washers. Any suggestions? Second guessing not going with wood….

  14. We moved into a house that has 3 decks made out of composite. We have the worst trouble with the one that gets direct morning sun. Tons of warping and now uneven to walk on. Gets extremely hot. Is there a solution to warped boards?

  15. There is a “newer” composite decking that does not have the challenges of the older generations of composites – it is less hot than other composites to walk on, less slippery, stronger, lighter and more stable. It has a 25 year warranty that includes removal and replacement. It is DecKorators Vault and Frontier decking. This deck material has been around for over 10 years and is growing in acceptance. It has no wood chips inside it to mold or mildew or rot. It does not have the expansion problems of PVC. It is so strong, you can swing a sledge hammer at it several times, HARD AS YOU CAN, and it will NOT break! AND, it doesn’t get brittle or weaker in freezing weather, and can be in ground contact or submerged in snow or water. This stuff is amazing!

  16. 100% recycled plastic deck anyone?! Hi, I am over in the UK and have just taken delivery of my deck. I was put off composite after some research… my understanding being that composite means your deck is a mix of wood “flour” and plastic… sounds like a mixture of MDF and plastic so of course the rot and is going to get in eventually. The answer for me was to go 100% recycled plastic. This was by a company called GovaDeck and whilst the price was eye-watering when compared to pressure treated softwood I’m hoping for zero maintenance once installed. Grey seemed to be the only available colour that looked decent, so it’s quite modern looking.

    I can keep you posted maybe after a cold season, I would also be interested to know if anyone else has any thoughts on/experience of using this material. Thanks

  17. Kyle, now that we are in the summer months what is your feedback as temps change in regards to warping and are you able to use the deck without shoes? Love the idea but with my Colorado sun I am concerned about mostly about how hot it gets.

    1. Hi Danielle,
      We’ve had a couple people comment/write us before and say that they had bad experiences with burns on their feet on composite decking 🙁 we wish this wasn’t the case. We would much rather have our theory/opinion proved wrong than hear that people are getting hurt.
      -Alyssa at The Craftsman Blog

  18. We have verenda decking in back yard. Worse choice we could have made when it comes to decking. It literally burned the bottom of my granddaughhters feet. I called Home Depot and they told me to call Veranda. Called Veranda and there response was to wear shoes. .
    Feel this material should be banned from all stores. Please if anyone knows how to correct this problem please let me know.

    1. Hi Kathy,
      Oh my goodness, we are SO sorry to hear that. Stories like this make us so sad. There are a lot of reasons we believe original materials are better, and stories like this make us wish that they didn’t prove our point because people are getting hurt.
      Best of luck to you in the future and thanks for reading our blog and joining the discussion.
      -Alyssa at The Craftsman Blog

  19. I had composite wood on my dock for over 15 years now. Love it. Yes it would get hot in the summer on bear feet but just splashed water on it. Little heavy but loved it.

  20. Our17 year-old trex deck has changed color yet remains solid on 12″ on-center joists without warping or maintainance issues. I call BS on detractors comments about this superlative product. When all else fails, read the instructions.

  21. Replaced wood with composite about 10 years ago. We got mold spots after a year or so. Fortunately we were able to eradicate the black mold spots using Olympic deck cleaner combined with scrubbing and pressure washing. Not a material recommended by Trex. It seems like the issue has gotten better in recent years, in that I haven’t had to clean or scrub as much. Originally we had to do this twice a year, once in the spring and again in the fall. While there has been some color fading, I consider it moderate. I have a question for anyone with some information. Is it advisable to use a waterproofing material like Thompson’s. We just cleaned it this year and I thought that might help make future cleaning easier.

  22. I was going to replace my old wood front porch with this stuff. I thought, “No painting!” “No maintenance!”.I guess this is not the answer…..Thanks for saving me a ton of money.

  23. It is so tempting to use composite….and vinyl siding…and vinyl windows…and spray foam. The amount of plastic/petroleum products that are on/in houses these days is quite astounding.

  24. A few years back I lived in a condo building that had some composite decking as part of a walkway. Only a few years after installation there was extreme warping to the point that it was a tripping hazard.

  25. Wow, thank you for posting this!

    I’ve built a couple of redwood decks at our houses and was seriously thinking of using Trex for the next house. I too was sold on the “No/low maintenance” aspect of using it. Now I see that’s really not the case at all.

    Looks like I’ll be sticking with Redwood and stain every couple of years!

  26. I just installed composite (Trex Transcend) on by deck as part of a major rehab (new wood on about 1/2 the framing plus getting up to code). I agree that the cheap and middle tier stuff can be garbage, but I think you should look again at some of the higher end products offered these days. They probably don’t save any money (damn it was like 3x wood price), but it is convenient not having to shovel spring snow off the deck every other day (snow in the spring melts then piles again then melts, causing anaerobic rot on wood, even pressure treated).

    We’ll see how well it holds up fading-wise. At least I have good shade 3/4 of the day.

    1. I think I’m in the unpopular group on this topic! 😅 We installed Trex composite decking on our 1900 country Victorian about 12 years ago. My husband and I spent hours debating whether to use wood or composite. Our winters are harsh and our house is sited in a damp’ish location. After four big dogs and two rough kids, the decking still looks great and is wearing well. The color has faded a bit and we do get the occasional moss growth. We pressure wash it about every three years. Meanwhile, my neighbor, who installed a covered wood deck is sanding and coating about every four years. Overall I’m very pleased with the product performance and would definitely choose it again.

      1. Hi Laurie,

        I’m so glad to hear it’s working well for you! Thank you for sharing your experience!

        Alyssa at The Craftsman Blog

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