Hello Phoenix,
Thank you for your great site. I need help trying to figure out what has happened with my latex mattress. I purchased it October of 2012 and primarily slept in the middle of the bed. I have an Ikea boxspring on legs with a fifth leg in the middle: Shop Quality & Affordable Products - IKEA CA It’s a typical wood slat construction.
My partner moved in with me after a few months and when I started sleeping off to the side of my bed, I noticed that the mattress had a big dip in the middle. The company exchanged it for another one. After 1.5 years, our mattress now has two dips on each side (one for each of us). They have exchanged this again, and noted that there was a defect in their first one (air pockets in the base layer, I believe).
We’ve been sleeping on the new one for less than one week and the exact same issue is cropping up again. I thought it might be the boxspring, so we moved the mattress on to the floor. It still has these stiff spots interspersed with softer spots where we’ve been lying. In fact, after only two nights, I could feel the spot where my partner sleeps (a depression in the mattress). The other very annoying thing is that the bed “dips” towards my partner (who is heavier) and makes it so that my hips are uneven, which causes pain. The bed does this on a granite floor as well, so it’s not the wood base causing this. I thought latex foam was supposed to guard against this phenomenon?
The wood frame seems sturdy enough, but there is give when we lie down on it without the mattress on it. How can a little bit of give in a wood frame lead to a mattress losing its support in less than one week? Or is it normal to have these dips and uneven places in a latex mattress for the first week? I may be noticing these dips more now than I did when I first got the mattress, especially as I did not move around so much on it back then, and especially because I’m very frustrated by this ongoing mattress saga! 
I now want to make sure I put this new mattress on a firm base so that there is no risk of the base causing it to bottom out like this. To do this, I’m assuming I will have to go with a non-slatted base with a bed rug, since it seems that all wooden slats will eventually dip. Is it ok to just get myself some untreated wood? Or is plywood better? Or can you recommend some places that sell non-slatted bed supports? (I’m in Vancouver, Canada). My apologies if this is mentioned in this thread–I did read all 19 pages of it, but maybe I missed any info about non-slatted supports. I plan to put the wood on top of my existing bed frame, plus add more legs for support.
I don’t want to get a metal frame because I found this article. Call me paranoid, but I don’t want to risk this if it’s true, especially after spending so much money on a natural bed! Toxic Chemicals in Your Mattress
Thank you very much for your help and great site! :cheer: