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How To Fix A Sagging Mattress With Plywood

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The easiest way to fix a bed that sags in the middle is to determine the mattress type, measure the sag's depth, and cut plywood that is smaller than the bed and mattress dimensions.

Plywood is a good short-term foundation option for mattresses compared to other, more cumbersome options.

Plywood provides a firm base and 'buys' you some time until you can afford to buy a new mattress (this should be your top priority).

Keep in mind that using plywood under sagging mattresses may lead to mildew growth and a softer mattress over time.

Will Plywood Really Fix My Mattress?

Plywood is your best option for fixing a sagging mattress besides buying a new bed entirely (which is the ideal solution).

In most cases, fixes are temporary. Using plywood to fix your sinking mattress might work, but it won't be the same as it was before.

Sagging causes structural damage in foams (and springs, if you have them) - damage that cannot be restored.

Keep in mind - plywood can cause heat pockets, so make sure your plywood sits on a sturdy, dry and straight surface.

Can Plywood be Used With Bed Slats?

Yes. Plywood can be used on top of bed slats.

Make sure your slats are less than 3 inches apart. Otherwise, you'll have support issues if your bed is larger than a full size (most people's bed size).

Metal slats can be found on Amazon if you want to save a trip to the hardware store.

Buying A New Foundation Or Box Spring To Fix A Sagging Mattress

Yes. A new foundation or box spring can help fix your sagging mattress.

You'll want to replace your existing support if it has soft spots on top (which indicates it's old and failing).

This also means your mattress is likely damaged from poor support.

Consider replacing not just your foundation, but your mattress too.

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