January 2020

Will my memory foam bed sag or dip?

Memory foam is renowned for complaints about it sagging and sinking over time. The truth is this will always happen when the same side of a mattress is repeatedly used night after night without rotating or turning it. Our article gives you some advice on how to minimise any sags or dips in your memory foam bed.

Updated 2020: So the quick answer to whether memory foam will sag or dip is yes it certainly will. It may be a shock to hear but the way that memory mattresses are made means they have the shortest mattress lifespan unless you follow some guidelines to help extend their lifespan.

The foam inside an ikea mattress being shown
Memory foam is notorious for settling into dips and bumps. This is because you can’t turn it to even out wear.

Memory foam compresses far faster than hybrid or latex foam beds so you need to be aware of how to reduce the settlement to limit the dipping over time. We provide some handy tips to try and avoid the problems associated with memory foam beds.

Compression is not always a bad thing, though, take the example of a new sofa at first when it arrives the cushions may look lovely and plump but, when you sit on it, you feel like you’re just resting on the top of the firm cushions, then after a few weeks the cushions ‘bed in’ and you get a more comfortable experience. This is the same with all synthetic mattress foams.

Our guidance is that all foams will compress at some point, it is more important to assess the percentage or amount of compression.

How far will my memory foam mattress compress?

The industry-accepted amount of sag in a memory foam mattress is 2cm. Which means that any indents of 2cm-3cm that don’t return to their original position are considered acceptable. This is a real issue with memory foam mattresses as the foam tends to hold a sleeper in one positon meaning this quickly becomes a dip where the sleeper lies. This is because there is repeated pressure applied night after night in the same spot. There’s no way to flip the mattress over meaning you’re concentrating all of your pressure in one spot continuously.

This compression and wear will happen far faster than a Natural Fibre Pocket Sprung Mattress. There’s no way to turn or even out memory foam wear, unlike Natural Fibres as you can’t turn the mattress over.

The industry accepted amount of settlement is 2cm-3cm
The industry accepted amount of settlement is 2cm-3cm
However, there's many variables that need to be considered such as material used
However, there's many variables that need to be considered such as material used

Memory Foam Mattress dipping & sagging

A dip is where part of the mattress has compressed beyond its tolerated level, assumed as 2cm in memory foam. It is usually the reflex layer that has failed as there is too much pressure on it for its intended use, or in cheaper mattresses, the quality is so low of the foam that it will fail when put under stress.

This causes a crater or hole effect that’s permanently embedded in the mattress. Once your mattress has dipped like this there is zero you can do to rectify it. The best method is to prevent this from happening in the first place with your mattress. This is where choosing a mattress with significant upholstery can almost eliminate the potential for sagging and choosing a two-sided model.

Guide to spotting a compressed mattress

How can I prevent my memory foam mattress sagging?

This is why it is so important to ensure you choose the right mattress for your specific needs. Choosing the correct mattress for your weight and tension will enable you to reduce the issue of compression or potential sagging that may be found with an unsuitable bed.

Our advice if you haven’t bought a memory foam or boxed mattress is to buy a 2-sided pocket sprung model than then add a separate memory foam or Latex topper.

Origins Pocket sprung 1500 mattress
The Origins 1500 is one of our Best Selling Pocket Spring Mattresses. Click to view.

The easiest way to prevent a mattress from sagging is to buy a high-quality Natural Fibre pocket sprung mattress such as our Origins 1500 mattress. This removes the issues experienced by many with Memory foam and foam pads where they get crushed quickly from wear.

However, If you do choose a Memory foam mattress you need to make sure that after this compression you still have enough memory foam to react to your body to support it and offer the comfort you require. The prime example would be a cheaper memory foam mattress which offers 2cm of memory foam, leaving little to no room for compression, causing a potential dip.  You should be looking for memory, hybrid, latex foam or other upholstery materials in the quantities that will offer enough depth after compression.

We wouldn’t recommend anything less than 5cm of any memory foam, hybrid foam or latex as a top ‘comfort’ layer as this will certainly settle really quickly.

How can I reduce compression and avoid dips in my bed?

One way is to make sure you rotate and turn your mattress regularly, once a month if possible.  This will even out the wear.  With a traditional mattress, you are guided to turn and rotate the mattress, with memory foam some mattresses construction methods make this unnecessary.  With our unique dual construction method, the topper is fully turnable and can be rotated as well to increase the longevity of your mattress.

luxury mattress details
Choosing a two-sided mattress will vastly improve the lifespan of your mattress. Click to view 2 sided mattresses.

Always look for a model with a separate removable topper this ensures that not only can you rotate the core mattress, but turn and rotate the topper.  The topper takes the brunt of the compression and you can even this our with turning.  It means that if years down the line the topper has compressed beyond what’s comfortable, you can simply replace this and not the entire mattress!

Alternatives to memory foam mattresses that don’t sag

The best way to prevent a mattress sagging is by choosing quality Natural Fibre sprung mattress that can be turned and rotated to even out wear and tear over its lifetime. You simply can’t do this with a one-sided memory foam mattress. You can also combine a memory foam or latex mattress topper with a pocket sprung mattress model. This can get you the feeling of memory foam but without the drawbacks. So if you’re a die-hard memory foam mattress fan then this method can be a good compromise. When your memory foam mattress topper compresses and dips you can simply replace it.

If you feel this is really wasteful, given they tend to only last 1-2 years, then a latex topper may be a better option. These last far longer and are not as heat retentive as memory foam. However, they are more expensive. Our Origins and Artisan mattress ranges are all two-sided so have a look at those models in comparison to no turn beds to see the difference.

Artisan Luxury mattress
Why settle for a one-sided foam mattress that may last half as long as a traditional mattress? Click to view hand made 2-sided beds.
To avoid memory foam sagging you will need choose a 2-sided mattress to begin with. Then maybe add a topper.
To avoid memory foam sagging you will need choose a 2-sided mattress to begin with. Then maybe add a topper.
Then you can turn and rotate your mattress each month extending its lifespan considerably.
Then you can turn and rotate your mattress each month extending its lifespan considerably.

All foams and upholstery layers will have a tolerance of 2cm-3cm compression over time. This is totally unavoidable but you can help even it out with a two-sided model.

By choosing a well upholstered and pocket sprung mattress you can significantly reduce the potential for sagging and dipping. As you have two sides to use and rotate through meaning your mattress will last far longer than a memory foam alternative.

On one-sided mattresses, we advise always having a separate topper comfort layer which enables you to do this and prolong the life of your mattress. Simply using your mattress night after night without any monthly maintenance will only speed up and exacerbate the compression and dips that may occur.

Why not get in touch with our expert team for tailored guidance on how to choose the best mattress? Call us on 0161 437 4419 or drop us a message below.

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