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American Hardwood


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Beautiful & Strong

BedInABox.com's American hardwood mattress foundation combines U.S. grown poplar hardwood and a high-quality quilted cover, to create a beautiful and strong foundation. Our foundation is kiln-dried, which won’t warp, crack, or split. It comes in an 8” or a low profile 5”, with a 4.75” distance in between each slat, ideal for our memory foam mattresses. It comes in one compact box so it can be easily moved through small spaces and assembles in about 30 minutes.

Need a lower profile in another size?

Don’t see the size you want in our 5” low profile American Hardwood foundation? Check out our Clever Connect™. It is available in an 8” or a low profile 5”.

Please note:

Assembled King foundations are one complete 75.5 x 79" foundation. If your bed frame is designed for a 'Split' King foundation, please order two Twin Extra Long sizes. Assembled Cal-King foundations are one solid 71.5 x 83" foundation. 'Split' Cal-King foundations are not available. Please read our FAQ 'Do I need a foundation or can I use my existing box springs?' for more details.


Size Dims Weight Package Dims
Twin 37.75x74.25 38 lbs. 4x16x76
Twin XL 37.75x79.25 42 lbs. 4x16x81
Full 52.75x74.25 53 lbs. 4x16x76
Queen 59.75x79.25 65 lbs. 4x16x81
King 75.75x79.25 80 lbs. 4x16x81
Cal-King 71.75x83.25 79 lbs. 4x16x85

Limited 5-year Warranty

Knockdown Frameworks, Inc. warrants all of its products for five years against any defects that are due to faulty materials or workmanship. This warranty covers product defects only and will expire five years after date of purchase by the original consumer purchaser, with proof of purchase required. This warranty does not apply to damage caused by and resulting from misuse, neglect, accident, or improper operation, maintenance, storage, transportation, or handling of the product. This warranty is for for residential use only and does not apply if the product is used in any commercial application (such as rental property). This warranty does not cover any incidental or consequential damages.

Trial & Return Policy

Mattress foundations may be returned within the 120 day trial period. This product is subject to a $50 shipping charge and a 20% restocking fee. Foundations must be returned clean and include all pieces to qualify for a refund.