Yes. The mattress will sag between the slats. An unsupported mattress will not only lose its integrity, it can cause problems with your back, not to mention your sleep. Mattress warrantees may also be voided if not supported by a proper foundation. Many people purchase platform beds for their low profile. If a mattress and foundation set makes the bed higher then desired, there are low profile foundations available to put under the mattress. If any foundation rises the mattress higher then desired, a plywood deck may be used. Be sure to check your manufacturer warrantee on the use of decking. If all the above fails, there are mattresses available that have a frame build into the bottom of the mattress. These mattresses are widely used for bunk beds in twin and full sizes. Other than low profile, the other reason people buy platform beds is because it saves money on box spring. before saying no, i would suggest you give it a try, see if there is a sagging problem or if you will have trouble sleeping at night. If none of that happens, then a box spring may not be needed. Of course, if you have the budget and don't mind spending another $300, then buying a matching box spring is always a good idea. I have found this blog about platform bed is useful, maybe you should keep track of it, it has a post just discussing the issue about box spring on a platform bed.
There should always be a few slats placed accross the bed frame before putting your box spring on. They are supports to your box spring.
You want to measure from the edge of your particular frame to the other edge and subtract about 1/4" for margin. Slats should be 1x6 at a minimum, at one per linear foot. 1x4's are ok if they are all that is available, but you should make sure to use 8 or more.
You can put a mattress on the floor and it will be ok to sleep on. Box springs are a unit that allows you to use the matress on a bed. The springs sit on the edges of the bed frame and keep the mattress from falling on the floor. If your bed frame has slats that go across from one side to the other, you can just use a mattress. It won't be as comfortable.
The vertical bars or slats must be no further apart than two and three-eighth inches or 60 mm, to prevent infants from slipping through or becoming stuck between them.
Slats Jordan is 6 feet 1 inches tall. He weighs 190 pounds. He bats left and throws left.
A regular bed usually has a set of box springs under the mattress. A platform bed just has slats supporting the mattress. Also, beds with box springs are also higher off of the ground than platform beds.
There should always be a few slats placed accross the bed frame before putting your box spring on. They are supports to your box spring.
Slats Long was born in 1906.
Slats Long died in 1964.
Venetian is a blind with horizontal slats.
Slats Gill died on 1966-04-05.
Slats Gill was born on 1901-05-01.
Slats Jordan was born on 1878-09-27.
Slats Jordan died on 1953-12-07.
The slats stabilize the plane (Mc Doneld Douglas DC10 for example) for take off. There has been two crashes in the instance when the pilots forgot to extend their flaps and slats.