A king fits perpendicularly below! Us two parents wanted to transition from bedsharing in our king with our 4 & 5 year olds to a bunk bed/loft bed where we can sleep in our king below and they sleep above us in the full. We found the perfect 6" platform frame that our king memory foam mattress sits upon, a nice 8" memory foam full mattress for them and it all works great! We did go to hardware store and but nylon washers (see pics) and glad we did because it prevents squeaking and for some reason one bar was about 1/3-1/2 inch shy of meeting it's connecting bar...so we used them as spacers and used a longer screw of our own (see photos). Anyways, we are happy. And in a few years, we can move our king out and slide a twin in with a small nightstand and both kids will be good to go for many years.
A king matress DOES fit beneath!
A king fits perpendicularly below! Us two parents wanted to transition from bedsharing in our king with our 4 & 5 year olds to a bunk bed/loft bed where we can sleep in our king below and they sleep above us in the full. We found the perfect 6" platform frame that our king memory foam mattress sits upon, a nice 8" memory foam full mattress for them and it all works great! We did go to hardware store and but nylon washers (see pics) and glad we did because it prevents squeaking and for some reason one bar was about 1/3-1/2 inch shy of meeting it's connecting bar...so we used them as spacers and used a longer screw of our own (see photos). Anyways, we are happy. And in a few years, we can move our king out and slide a twin in with a small nightstand and both kids will be good to go for many years.