- Posts: 32
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I would think any perceptible sag/deflection in your foundation could make a difference in your sensation of firmness, the overall comfort, and possibly even the durability of the mattress.
I've seen pictures of the Zenhaven foundation. A picture isn't much to go on, but to my eyes the slats appear to be too far apart (relative to recommendations one sees for latex mattresses). A little give in an individual slat is one thing (maybe even desirable?), but if you press down simultaneously across several slats, using your forearm or a board to distribute pressure, do they bend much under your body weight?
I used an exciting online tool called the "Sagulator" to predict slat sag/deflection (yes, I know, I need to get out more). I figured a 5 pound load per linear foot of 3/4" thick poplar slat (using a generous estimate for total mattress + human weight, divided by slat surface area). Sagulator computed a total sag of .11 inch over the 60" width of each fixed slat, which it deems "acceptable" ... for a book shelf without fibromyalgia.
Thanks for your contribution to TMU’s Forum and providing an interesting concept in the use of the online Sagulator tool . Unfortunately, the tool does not translate to the physics of a mattress foundation for a number of reasons, but it’s a provocative concept nonetheless. Zenhaven ( by Saatva) mattresses are produced through a network of independent contract manufacturers throughout the US (and also now in Canada, I believe). These mattress manufacturers have their own design and specification for wood foundations which are primarily low-cost offerings that are made and sold to regional mattress retailers. If you visit the Zenhaven website, you will notice there are not any details or transparency about the foundations other than 2 height options available. In general, the quality of the foundations is controlled by the regional contract manufacturer. The designs are fairly similar as most are “industry standard” promotional wood foundations. These designs are prone to making having noise from the wood (and in many instances, cardboard) movement under the mattress. However, the promotional wood foundation design has shown that is can properly support most mattress systems. While this design is not one TMU recommends, it is widely used and is an economical alternative. I'd keep in mind that using a promotional wood foundation under a luxury mattress appears to be a risky way to save a few dollars.
The "Sagulator" is designed to predict shelf sag (not bed slat sag). I wonder how hard it would be to adapt it to show whether a certain number of slats, of specified size/spacing/etc., could handle a specific mattress?
Meanwhile, I go by an old carpentry/woodworking adage: "When in doubt, build it stout". I bought a bed frame that appeared to be well made, from an apparently reputable furniture maker. Then I beefed it up even more (by adding a hardwood center rail). I'm now fairly confident that it will not sag significantly during the usable life of the mattress. I'm not sure I could say that about something like the Zenhaven foundation (given the apparent slat spacing and lack of specifications.)
Hi Cloud999! I'm getting ready to call SleepEZ and thought I'd check in and see how you were liking yours, any "discoveries" I should know about?
Zenhaven 2.0 has not had all the failures of the original one they sent but it's still not "my" bed. Making it work with 2 toppers, which makes me feel like the fancy mattress buried 3" deep isn't worth it.
I wanted to revisit something Phoenix mentioned above...that the promotional wood foundations are a risky way to save a few dollars.
Is it even a savings at $260 a pop? What would a good foundation cost?
I never would have bought the foundation had I looked harder on the forum...it just never occurred to me they wouldn't make a foundation up to the same quality as the bed!
(Then again...with the latest glue seam find today in the sleeping portion of the mattress...I'm not sure what that quality really is? Better than the average bed in a box, I think, but not as good as the marketing would make you think.)
Crap. The new foundation is starting to fail. It's not as dramatic as last time, but I took out a level and checked the slats. Without a center support in the foundation, it's bowing to center. Which makes the whole mattress bow to center...
I don't even sleep in the center. I'm not that hefty at 135lbs. I've only slept on it for about 3 months.
Sorry to hear about the foundation, not sure what there policy will be but it is not surprising especially given the weight of the mattress...although even the most basic box springs do not show that much failure at three months.
Good foundations can be a lot more than $250.
There is more information about the different types of support systems (bedframes and foundations or platform beds) that are generally suitable for different types of mattresses and some examples of each of them in this post . I would also keep in mind that these are general guidelines and some manufacturers have requirements that may be different so I would always confirm with the retailer or manufacturer of your mattress that any support system you are planning to use under the specific mattress you purchase meets their warranty requirements and guidelines.
Thank you Sensei! Yep, this is the second one of their foundations to fail...I know the TMU line is to buy the foundation the manufacturer recommends but I would say in Zenhaven's case...don't. For other Zenhaven owners, please do note that slat foundations VOID the warranty unless there is a solid surface over them. I would rather do slats for ventilation but fortunately it's not very humid here.
Zenhaven will allow me return the foundation in this instance.
Thank you for the link! I have attempted to wade through some of the 76 pages in the foundation page but lots to take in! Ultimately for me I think a new foundation will be secondary to dialing down a mattress, so it's all warranty-approved and such.
Thank you for your continued help!
Since you are such a prolific poster, I orginally wanted to send you 176 pages of links, but I figured you could do the 76 pages in half an hour or so.......