California King Split Box Springs & Foundations

The Serta Flat Mattress Foundation is a box spring alternative and provides the perfect support for your Serta mattress, adds 9” in height to your bed, and is designed to provide durability and long-lasting comfort. Pairing this bed base with your mattress will support it and extend its life while helping isolate the effect of your partner’s movements in bed.

Great quality and meeting all needs. Anonymous. Monterey, TN. Sat Aug 22 2026

We are a proud manufacturer of the finest quality box Springs, with the highest standards in durability, quality, comfort, & beauty. All of our products are made in the USA to ensure that you get only the best! This item is part of our Hollywood collection, it has the following features: this box spring is uniquely designed to give you the kind of undisturbed sleep nature intended. Wood foundation, Continental box meets federal standards 1632 and 1633 fire code.

These fit perfectly! We just needed a little extra support and our bed raised because it was too low. We purchased the 8 inch box springs. They came in two separate boxes and we’re fully put together. We simply had to place them on our bed and put the mattress back on top. Love these.. Connie. Mc Bain, MI. Thu Oct 15 2026

Welcome to the Alwyn Home! Here we offer you the best prices for the best quality. Come have a look at our latest Split Fully Assembled Box Spring for Mattress from our Alwyn Home collection. This design is handcrafted so that you forget back pains and discomfort forever. Lay down your favorite mattress on our box spring to enjoy the beautiful sleep you always wanted. The equally distant slats and wood frame do not let the frame loosen up and are strong enough to handle various kinds of duress. You don’t need to worry about a squeaky bed frame ever again. The excellent packaging and design of the box spring are pre-assembled, just the perfect fit for your bedroom. The product is lightweight even as a traditional box spring and lets you have these benefits in assorted sizes namely: Twin, Twin-XL, Full, Full XL, Queen, King, and California King. We have twin profiles of the product in 4” and 8” thicknesses crafted just for your needs.

Love that you just open up the box and the foundation is already assembled. Just have to put the two sides together on the bed.. Anonymous. Fri Oct 23 2026

The bunkie board split bunkie board provides a surface foundation for any platform beds, bunks, and daybeds. It adds support to the mattress and will keep the mattress stay in good shape thus extending the life of your mattress. It will give firm bottom support for the mattress and raise the mattress by about. When a mattress is placed directly on slats or metal springs, the mattress will tend to rip or sink. These can be avoided with the use of a bunkie board. Using a bunkie board doubles the mattress' life expectancy. This bunkie board is a good alternative instead of a box spring that may be too high for day beds. It will give the bed a lift without adding much height. This bunkie board is strong enough to be used directly on the bed frame instead of a box spring. It will give the mattress a lift which is quite low but will hold up the mattress. It is wrapped in a stitch-bonded nonwoven fabric. It meets federal standards 1632 and 1633 fire codes. This bunkie board will give you enduring comfort and durability for excellent sleep. The split design will give you convenience and easy mobility since the 2 piece varieties are very lightweight utilizing 2 smaller pieces making them easier to carry and maneuver through the cramped quarters of an apartment house. Continuously aims to be the most reliable direct mattress manufacturer in the industry. With our prominent name and superior service, we satisfy customers all over. All of our products are made in the country to ensure that you get only the best. We take great pride in the quality of our products and the quick service we provide. Our customers are our best advertisement. Customers and business partners alike have experienced the company's commitment to the unbeatable service we provide for their high-quality products.

I just received and started using it, and so far Im very pleased. It fits my bedframe platform perfectly and gives just the right amount of extra support to my mattress. I would recommend this product.. Cheryl. Thomasville, NC. Sun Sep 06 2026

Upgrade your sleep setup with this heavy-duty metal box spring designed for strong, stable mattress support. Featuring reinforced steel slats, noise-free construction, and a clean fabric cover, this 9-inch foundation offers lasting durability with easy assembly and reliable everyday comfort.

Exactly what I needed just the right height to go with my 12 inch mattress. Sally. Lubbock, TX. Thu Sep 10 2026

Discover the perfect foundation for your bedroom with our box spring, designed to combine elegance and durability. Handcrafted with care, the slats are strategically arranged to support your mattress, ensuring lasting stability for years of restful sleep. Featuring Kara-Guard padding, this box spring replaces ordinary cardboard, offering a quiet, noise-free experience that enhances your peace and tranquility. Choose this expertly crafted box spring and elevate your bed to a true sanctuary of serene sleep.

Very lightweight and easy to maneuver. Made the bed height and comfort level so much better.. Marsha. Midlothian, VA. Fri May 29 2026

Discover the foundational piece your bedroom with our mattress foundation, a testament to understated elegance and robust support. Handcrafted with precision, the slats are arranged to cradle your mattress, ensuring stability that lasts through years of restful slumbers. The unique combination of Kara-Guard padding, in place of ordinary cardboard, offers a silent guardian against noise, so your peace is never disturbed. Whether you choose the stately 9” regular profile or the sleek 5” low profile, this box spring is a canvas for comfort in any bedroom. Opt for this crafted foundation and transform your bed into a bastion of serene sleep.

Good. Zeina. Sat Sep 05 2026

9inch All wood foundation

Ordered a King Boxspring and received half of the mattress only. Called Wayfair and their only solution after I have waited weeks for this is that I would need to return it and shop for another bed! The representative acknowledged that the listing was wrong and lead buyers to think they were getting the entire King Boxspring but said there was nothing she could do to help me based on their error. She said she could refund me and I can shop for another bed. Now I still have no Boxspring for my bed and have to sit with this in my living room until a delivery company can come pick it up if at all. Wayfair needs to fix their customer service because they messed up and have found a way to make their error my problem. If you have a King bed you better order 2 of these.. Patria. Elizabeth City, NC. Thu Nov 30 2023

High-grade durable steel is configured and welded into a unique design for dynamic support of Kingsdown mattresses to further optimize mattress performance and support the body for optimal sleep through the night.

For the price, this Kingsdown foundation is a winner. I used this to replace and old Sterns and Foster box-spring that started to squeak and disturb ones sleep. This replacement has been a pleasant surprise! Highly recommend.. Denise. MO. Sun May 11 2025

Bring added comfort and more restful sleep to your life when you choose to add our two-inch split box spring mattress foundation to your bed. Featuring a slat support system made from North American timber, it has three layers of multi-needle quilting in a white knit fabric with fire-safety stitching.

Solidly constructed. Packaging a bit frustrating.. Wenshuo. NJ. Sat Nov 30 2024