Insufficient support from beneath or a breakdown in their internal support structures.
Best plywood for mattress support.
You may not get correct support.
If you do not want to throw out your box spring just yet adding a few layers of plywood will make your box spring firmer.
The plywood can be exactly 3 4 inch thick but ideally it should be thicker.
A mattress with plywood will not give the same support as a fresh new mattress.
Hope this helps brian.
As i say in this particular article the 1 2 plywood or pressboard over an existing foundation works great with memory foam or latex mattresses.
This may require two sheets of plywood if the bed is queen size or larger.
The thickness requirements for plywood vary depending on the type of mattress.
Most people prefer a firm mattress and rightly so.
You will definitely need a strong support if your mattress is foam or latex.
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Sagging mattress mattresses sag for two reasons.
The plywood must be 0 75 inches thick.
All these types of mattresses need is a firm uniform bottom for proper support of the mattress.
Plywood should be of the same dimensions as the mattress and the bed frame.
Measure the mattress and cut a sheet of 3 8 inch plywood to the same size.
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If finished the plywood can be put on the bed frame and the mattress directly on the plywood.
Using plywood may not allow the mattress to breathe properly and the wood can hold moisture even mold.
Plywood thinner than 3 4 inch should not be used as it will not be strong enough to hold the weight of a bed mattress and a person lying down.
This protects the mattress from splinters that can come from the plywood.
Using plywood board between the mattress and the bed frame can provide the additional support you need.
There are many ways to make your mattress firmer.
A tarp or a non penetrative sheet can be used to cover the plywood.
Wood under the mattress can splinter causing the mattress fabric to snag and unravel especially in the case of 2 sided models.