Using inch thick plywood is okay but ideally you should use plywood thicker than that to provide adequate support.
Best plywood for mattress support.
If finished the plywood can be put on the bed frame and the mattress directly on the plywood.
Most people prefer a firm mattress and rightly so.
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.
Measure the mattress and cut a sheet of 3 8 inch plywood to the same size.
It s not the best solution but plywood under the mattress is a decent temporary fix.
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.
Using plywood may not allow the mattress to breathe properly and the wood can hold moisture even mold.
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.
Wood under the mattress can splinter causing the mattress fabric to snag and unravel especially in the case of 2 sided models.
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.
The thickness requirements for plywood vary depending on the type of mattress.
There are many ways to make your mattress firmer.
Sagging mattress mattresses sag for two reasons.
Ditch your uncomfortable mattress for nectar s memory foam mattress with a lifetime warranty.
The best mattress pads of 2020 including machine washable mattress pads cotton mattress toppers and mattress pads for back pain to up the comfort level of your bed.
You may not get correct support.
Insufficient support from beneath or a breakdown in their internal support structures.
Plywood should be of the same dimensions as the mattress and the bed frame.
Using plywood board between the mattress and the bed frame can provide the additional support you need.
Mattress helper under mattress support fix your sagging mattress firmer solution for mattresses twin single side coverage king 3 6 out of 5 stars 780 zinus gulzar easy assembly quick lock 1 6 inch bunkie board bed slat replacement twin.
This protects the mattress from splinters that can come from the plywood.
Hope this helps brian.
You will definitely need a strong support if your mattress is foam or latex.