Menu Ask a Question Share a Post Account Search. Spring mattresses use coils as the main foundation layer, but customers often report this mattress type sagging after only a few years. First, we have to figure out if the sounds you’re hearing are indeed coming from the box spring. If your box spring or foundation isn't supportive, it could cause mattress weaknesses. 0. All mattresses will sag eventually, and this effect will have a significant impact on the bed’s feel and comfort. There is some debate as to how long mattresses actually last, most spring mattress companies recommend replacing them every ten years, but in actuality the time it takes to lose tension is probably closer to five or six. Rather than toss out an old box spring mattress you may be able to clean and repair it. Hybrid mattresses will usually use a combination of steel coils and wrapped coils, while foam and latex mattresses use high-density foam in the base. 1. Follow these steps to use plywood to fix a mattress that sags in the middle: The maiden step entails establishing your mattress … Flag. If you own a slat-based bed, use the plywood sheet to lace the slats. This is a guide about repairing a box spring mattress. How To Fix Dips in Your Mattress Videos #1 and #2 below walk you through how to fix a sagging plush top mattress - Video #3 shows how to fix dips in a Pillow Top style mattress - Video 4 shows why mattresses with latex stay much cooler than memory foam, especially Tempur type mattresses In this video below we will show Share. Repairing a Box Spring Mattress. Print. Pin. For those with box spring beds, placing plywood between the box spring and mattress is the prudent thing to do. Thankfully, there are a few things that mattress owners can do to help minimize the effects of sagging. Category Beds. Confirm the Source of the Noise. Email. Save. If your foundation's slats are broken or lacking, you can fix the slats, add more slats, or place a piece of wood over the slats for a more even surface. Follow. Unfortunately, you can’t really “fix” a sagging mattress. A box spring costs less than a mattress in most cases, which makes replacing yours a more affordable fix. How to Fix a Sagging Mattress.