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Heavy Duty Bunkie Board King Size (76x80) - Under Bed Support

  • Based on 296 reviews
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Availability: In Stock.
Fulfilled by Amazon

Arrives Saturday, Oct 17
Order within 21 hours and 59 minutes
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Size: King (76x80'')


Features

  • NON-SLIP GRIP STAYS PUT A textured grip-side base locks onto your king size bed frame so your mattress stops shifting at night. Face the grip side down toward your slats or box spring, and the fabric side up toward your mattress, for the most secure, quiet fit.
  • FITS SLATS OR BOX SPRING Works on king platform beds, metal or wood slatted frames spaced 10 inches or less apart, and standard box springs. This king size king size bunkie board reinforces your existing foundation it does not replace king bed slats or a box spring, so measure your gap first.
  • REAL MATERIALS, REAL DURABILITY A fluted core with internal air channels resists trapped moisture, unlike MDF or solid wood. Wrapped in tear-resistant Oxford 600D fabric, this king bunkie board flexes under everyday pressure instead of cracking or splitting over time.
  • TWO PIECES, ONE FLUSH FIT Ships flat as two 38" x 40" panels that unfold and seat together edge to edge for one seamless 76" x 80" king surface. No tools, no hardware, no assembly just unfold, place, and you're done in minutes.
  • LOW PROFILE, BIG DIFFERENCE At just 0.4 inches thick and 18.5 lbs, this king mattress board adds firm, even support without raising your king bed height or your moving-day workload. A simple upgrade for renters, first-time homeowners, and anyone who wants better king mattress support.

Description

Do I still need bed slats if I use this board? Yes. This board sits on top of your existing bed slats or box spring — it reinforces them, it doesn't replace them. It works with slats spaced 8 inches apart or less. Which side faces up when I install it? The fabric side faces up, toward your mattress. The textured grip side faces down, toward your bed frame. Installing it upside down is the most common cause of the board shifting. What is the board actually made of? A fluted plastic core with internal air channels, wrapped in Oxford 600D fabric on top and a non-slip grip surface on the bottom. Unlike MDF or wood, the core won't absorb moisture or warp over time. It comes in two pieces — will there be a gap in the middle? No. The two 38" x 40" halves are designed to sit flush, edge to edge, when seated correctly on your slats. The two-piece design makes it easier to ship and maneuver into place. Can I use this with a box spring instead of bed slats? Yes. The board works on top of either a slatted frame (8" gaps or less) or a standard box spring. Bunkie Board King Bunkie Board Queen Bunkie Board Cal King Bunkie Board Full Bunkie Board Twin Bunkie Board Full-XL Bunkie Board Twin-XL

Item Weight: ‎18.5 pounds


Product Dimensions: ‎80 x 76 x 0.39 inches


Item model number: ‎1


Date First Available: October 29, 2025


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Oct 17

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • highly recommend, transformed my squeaky metal bed frame and sagging mattress into just right
Size: Queen (60x80'')
This transformed my squeaky metal platform bed into a more sturdy, quiet one. My recently purchased, high quality mattress kept sagging down the middle and no matter what I did I couldn't get the metal pieces to stop squeaking. This made everything better, and was not too firm like solid wood might be. They're incredibly easy to put on because there are two that are each half the size of the bed. So a single person can push the mattress halfway, unfold and install this product, and then repeat on the other side. It is extremely sturdy and durable which is not what I expected, it's much better. Since they are two pieces, you could also use them on smaller mattresses and beds. Highly recommend. ... show more
Reviewed in the United States on March 7, 2026 by Chris

  • Works great.
Size: Full (54x75'')
Works great and goes on easy. Zero issues. Make sure you measure though just to make sure that you get the right size. I’ve had it on my full size bed now for two days and I have way less back pain 👍
Reviewed in the United States on March 11, 2026 by Cward55

  • Amazing 10/10 BUY IT!
Size: Queen (60x80'')
Amazing 10/10 if i had another bed, i would get another one. Initially only bought one for my mother. But after seeing what it did, i decided to get one for myself. And made a huge difference. Quality is amazing. Fits perfectly, make sure you check the size. Increase my sleep quality. I saw some reviews where it said it caved in. I got a little worried since im on the heavier side. My guess is that they removed the slats or box spring. This is meant to lay on top of it. Will buy again if i ever need a new one. Yall should too. Its worth it. ... show more
Reviewed in the United States on March 6, 2026 by Cristian

  • Works as expected
Seems good, hard to know as it only been used a short time.
Reviewed in the United States on January 4, 2026 by Linda Starbard

  • Saved us from buying another mattress
Size: Queen (60x80'')
I never dreamed a bunkie board could make such a difference in our sleep and how our bodies feel in the morning. We have a very expensive mattress on a platform bed; the expensive mattress should be enough, right? Wrong. We slept fitfully and woke every morning with back and hip pain. Finally, after a year of this I came across this bunkie board. We decided it was worth trying. I'm glad we did! What a difference the extra support made. We slept well and woke without pain. It was as easy as one, two, three to set up. The worst part was wrangling the heavy mattress off the platform bed, but we managed. There was a slight odor at first so I left the mattress off the bunkie board, opened a window for a few minutes and when I checked on it a little later I didn't notice any smell. I suffer from migraines so I'm super sensitive to odors triggering a headache. I had no issues. I ordered a queen size board and fit perfectly. The bunkie feels very sturdy across the platform slats and I believe it'll last for a long time. I'm very pleased with the product. In fact, I'm planning on ordering another one for our other platform bed. At the price point it was definitely worth the try and I'm so glad we did. ... show more
Reviewed in the United States on January 6, 2026 by Mary

  • Too expensive for what it is
Size: Queen (60x80'')
It's an immediate difference in the way my bed feels, yes. It's got rubber grip to stop it from sliding around on my bed frame, but let's be real. You could make something equivalent easily from ace hardware. A piece of plywood, some kind of fabric stapled to the top to stop it from damaging your mattress, and some kind of rubber feet. That's all this is, and that doesn't cost $115. ... show more
Reviewed in the United States on March 19, 2026 by Vincent M.

  • As described.
Size: Queen (60x80'')
I got both a queen size and a full LX, both fit perfectly. They were easy to place. I have a mattress on the queen. My mattress hasn’t shifted. It seems to give extra support. So far it seems durable.
Reviewed in the United States on February 17, 2026 by Mary Schroth

  • Easy to put together
Size: California King (72x84'')
Very sturdy and super easy to put together. Highly recommended.
Reviewed in the United States on March 7, 2026 by Donna E.

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