However, over time the cellular structure of memory foam breaks down, becoming softer and losing its ability to bounce back, aka to support you. If your memory foam mattress has a body impression that stays long after you've gotten up, or if the impression is deeper than two inches, it's time to replace it.
Sagging memory foam mattresses can be fixed by rotating the mattress 180 degrees or flipping it. It makes sure that your heaviest body parts apply pressure in various areas, thus dispersing the memory foam and making the bed even. Using a memory foam mattress topper is another option.
Much like latex, foam mattresses vary significantly in terms of their materials and corresponding quality. Memory foam mattresses can last 10-15 years, especially if they are made with high-density materials and maintained well. However, low-density foams will only last around 5–7 years.
Memory foam mattresses will sag or dip over time which is one of the drawbacks of one-sided foam beds. Memory foam is notorious for settling into dips and bumps. This is because you can't turn it to even out wear.
Here's how often she recommends changing your mattress based on its material: Latex: 10 to 15 years. Memory foam: Lower-quality mattresses should be changed after around five years have passed. Better-quality ones can be switched out every eight to 10 years.
Rotate or Flip the Mattress
If you're noticing body impressions from where you sleep, merely rotating the memory foam mattress can solve the sagging issue. Mattress manufacturers recommend rotating your mattress every three months. This practice evens out wear and tear, and may even extend the life of your mattress.
Although memory foam is generally considered safe, it may pose a problem for certain people, such as those who suffer from allergies, asthma, or other respiratory conditions. Memory foam may also bother you if you are very sensitive to smells.
But a mattress is likely sagging in the middle more often than not because it's simply getting old. Over time, your sleeping habits cause physical changes in the materials within your mattress. And areas that receive frequent pressure tend to lose structural integrity faster than others.
Sagging Mattress Causes
Low-Quality Construction– Some memory foam mattresses are just poorly made. All memory foam contains chemical additives that speed up degradation, but some use cheaper foam blends than others and start to sag with just a couple years of normal wear and tear.
Sagging or Squeaking
Once the mattress begins sagging, it's unable to provide you with even support or proper spinal alignment. Similarly, a squeaking innerspring mattress is a sign of worn out springs and that the mattress can no longer support you.
In short, yes, a 20-year-old mattress is definitely too old and should be replaced. At that age, it's highly likely that it's filled with a buildup of dust mites, allergens, and potentially mildew or mould. The structural integrity is also likely compromised, leading to sagging and less effective support.
Retention of Heat
One of the most common complaints about memory foam mattresses is that they trap heat and become uncomfortably warm. Memory foam, particularly traditional memory foam, can become quite warm due to its design to respond to body heat and the density of the material.
Respiratory symptoms can also indicate a memory foam mattress allergy. These can include sneezing, runny or stuffy nose, coughing, and difficulty breathing. These symptoms are often caused by dust mites and mold spores that can accumulate in the mattress, triggering an allergic reaction in sensitive individuals.
On average, a memory foam mattress lasts about 8 to 10 years, but it depends on a few factors.
Similarly, electric blankets and hot water bottles should not be used with memory foam mattresses as the strong heat source will interfere with the foam's performance, damage the structure of the foam, and ultimately shorten its lifespan.
There are several advantages to using plywood under your mattress. Firstly, plywood creates a solid and uniform surface that can help prevent sagging. This is especially beneficial for mattresses that lack proper support, as it can help distribute the weight evenly and maintain the mattress's shape over time.
Disadvantages of Memory Foam Mattresses
Retain Heat: The main drawback of these mattresses is the heat retention problem. The traditional memory foam without technological add-ons tends to get very hot through the night and may become uncomfortable.
How Do I Know If My Tempur-Pedic Mattress Needs to Be Replaced? If it no longer comfortably supports your sleeping patterns and your body starts to feel a lack of support from your mattress.
Memory foam is a durable material that retains its shape well over time. High-density memory foam is more resilient and less likely to sag. However, mattress sagging is to be expected over time. With correct mattress care, you can help minimise the effects of sagging and prolong the life of the mattress.