Super Duty Foundation High Profile 8.25″ Springless Box Spring Quick Assemble (King)



Made In The USA!

Free shipping at STL Beds


  •  Our strongest foundation for your toughest job & is handcrafted from solid wood.
  •  Super Duty Construction 8.25″ Tall Foundation.
  • Our Very Best Support Built to support the heaviest toughest applications.
  • 1 Sturdy Reinforced I-Beam running head to toe for maximum strength.
  • 14 Super Wide Bed Slats: Closely spaced for complete mattress support and spaced for better breathability.
  • Fast Do It Yourself Assembly: Approximate assembly time is just over 15 Minutes. No tools are needed.
  • Fits Most Anywhere: Goes right through those nightmare stairways, the narrowest hallways, and extremely tight turns. Fit in places where a traditional one-piece box spring/foundation won’t fit.
  • Free & Fast Shipping To Your Home.
  • Learn More Below:
SKU: KDSDHP825found-K Tags: , ,


1-Piece Super Heavy Duty High Profile Boxspring

Walk the Super Duty Low Profile Springless Box Spring 8.25″ (King) easily through your home and assemble it in your bedroom.


Every mattress should have a sturdy foundation and the very best mattresses require one. A great support system needs to be resistant to dipping and sagging. It is extremely important that your mattress has the necessary required support for long life, warranty compliance, and comfortable sleep.


Will It Fit? Simply carry the box with contents into your room of choice, pull out the pieces, and lay them out according to instructions. Take it in the room you thought you couldn’t get a boxspring into and assemble it according to the directions.


Compare Super Duty To The Rest


Ours: We do not sacrifice building materials, strength, and durability for profitability. The hand-crafted Super Heavy Duty knocked down, solid wood foundation is built exclusively for STL Beds to the most rigid of standards. You can’t beat the value. The very best construction for the same or less than most brand name boxsprings and 2-3 times the quality. That is no joke! We stand behind our quality and encourage you to compare this to any big brand name boxspring or foundation. Why?


Because our super heavy-duty wood foundation starts by doubling the total number of wooden slats to 14 you will receive with your new system. Each slat is at least 2 1/2 inches wide and made from Canadian spruce and fir. No matter what size you choose, each corner will bolt securely together with a large carriage bolt to secure the mainframe together. Then it is reinforced with two wooden dowel rods. All super duty foundation sizes include a solid wood I-Beam running head to toe that includes extra support blocks for added strength. California King, Eastern King, Queen, and Full all include two super-strong I-Beams.


Compare this to our competition who typically uses nothing more than a 1 3/8 wide, flimsy piece of wood for center support and with no reinforced support anywhere. STL Beds adds additional wood blocks for extra side strength down each side of the foundation for seating. We only use solid wood to provide the optimal support for you and yours and your new or old mattress.


Theirs: Most of the box springs and foundations built today are stapled together using only 7 to 8 wood support slats. The wooden slats are usually only 1 1/2 inches wide instead of 2.5 inches wide. They include no middle or side strength reinforcement for strong seat edge support. Most brand-name foundations are supported by a flimsy wire support grid. In fact, the only advantage of a system like this is that they are lightweight.


NOTE: This is NOT a plus. In fact, it is a sure sign that very few raw materials were used to build the unit and are probably not built to last all while charging crazy prices to you.


What Kind Of Mattress Can I Use This Box Spring With?


The STL Beds Quick Assemble High Profile 8.25″ tall heavy-duty foundation can be used underneath virtually any type of mattress including memory foam beds, all bed in a box type of mattresses, latex mattresses, coil spring, pocketed coil beds, and hybrid beds. The slats are spaced 2 3/4 apart to provide the necessary support for all the listed mattresses.


The foundation comes with a luxurious encased cover that completes the look of your mattress set. The neutral, white-colored cover allows for it to coordinate with virtually any mattress color and design. The zippered encasement fully encases the foundation for a beautifully tailored look.


Your new knockdown mattress support system comes with all the necessary parts for a trouble-free assembly. The estimated time to remove the packaging and assemble is 15 – 30 minutes. The foundation comes in pieces making it a one-person job. Carry the foundation into the desired room piece by piece or in the box. This is a smart alternative to the traditional two-person carry of a traditional bulky box spring. No tools are needed to turn this dream into a reality. Everything you need comes standard.


This Knock Down (KD) Wood Mattress foundation is shipped directly to your house. This springless box spring can be knocked down and moved at your convenience, making it easier to move than your ridged one-piece box spring or costly split box foundations. It is ideal for tight spaces such as upstairs where your traditional foundation or box spring may have fitment issues.

Additional information

Weight 94 lbs

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Product Features

Features & Benefits:


  • Made In The USA!
  • What Can This Hold? It’s the hardest working foundation in the business. Supports softside waterbeds, bariatric people, plus sizes, latex mattresses, memory foam, heavy people. We can support it.
  • Solid Wood- All solid wood super sturdy structure. We do not use any composite woods OSB oriental strand board, particleboard, or flimsy sheet metal slats.
  • Super Duty Foundation Height– 8.25” It is so popular it is our bestselling height. People like how it looks and how it makes entering and exiting the bed easier.
  • Individual Mobility– Lifts mattress to a more sensible bed height. How high will my bed sit when complete? Simply add the height of your frame, mattress, and foundation together. This is the point where you need to determine if this finished height will work for: Kids so they can easily climb into bed with you? Aging pets that can’t jump that high. Can the elderly get in and out without problems or is falling out of bed a concern?
  • Take It Anywhere Easily– Move it assembled or take it apart for lightweight moving that can be done by one person with ease. When unassembled this foundation can fit through very tight spaces and even through low overhangs where 1-piece boxsprings normally will not fit. Foundation can be assembled in the bedroom.
  • Solid Level Mattress Support– Even weight distribution for better consistent support. Improves overall mattress life. Helps prevent that annoying middle mattress ridge associated with split two-piece foundations.
  • Wider Slats & More Of Them– Fortified with 14 solid wood 2 1/2-inch-wide slats that are properly spaced for perfect support. The slat count includes head and foot end pieces which are block reinforced. Breathable Design- The engineered design allows this mattress to breathe properly. The natural spruce construction and soft zippered cover mean you get perfect airflow no mattress what kind of mattress you choose.
  • Zippered Cover- Easy to install. Easy to remove it and disassemble foundation for easy moving. Replace it if you stain it. Do not wash spot, clean only.
  • Closely Spaced Slats– the distance between each wood slat 2 3/4
  • Bolted Together– bolted together in each corner with carriage bolts. Also includes wooden dowel rods for additional strength.
  • Less Movement– no bouncy coil springs for unmatched motion isolation so sleeping partner is not disturbed during the night.
  • 1 Solid I-Beam Construction– Includes one super heavy-duty head to toe center support I-Beam with extra support blocks. Most competitors don’t have one and simply single, thin piece of wood as a head-to-toe backbone running head to toe.
  • Stronger Seat Edge Support– extra wood block supports down each side for reinforcement for sitting when entering, exiting the bed. Includes All Necessary
  • Hardware– Included
  • Fits All Types Of Bed Frames– Hollywood, steel, platform, beds with headboards, beds with headboards and footboards.
  • Weight capacity– can support up to 3000 pounds when weight is distributed properly. So strong it can support a soft-sided waterbed.
  • Nightstand access– helps put your nightstand within reach for better access and ease of use.
  • Zippered fabric cover- this cover installs easily. Simply pull over the foundation and zip it closed.No tools needed or required for assembly
    Available in all sizes
  • Quiet- Whisper quiet so you sleep better and are not disturbed.
  • Perfect For Active Couples.


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