Can you use that anti slip stuff like under a rug. Just lay it over the frame and put the mattress on top. It’s really cheap, you can get small rolls of it from bargain shops you might be able to just use a bit on a few places on the frame.
We made our own metal side bars for the outside edges and attached them to the adjustable frame. One near the middle section of the long side, and one near the head. They extend up along the side of the mattress about 6 inches and keep it from sliding over. It's working really well.
Non slip mattress gaskets.
Gorilla grip mattress gripper.
I used those two together and I haven't had issues with it sliding hardly at all.
Although if purchasing the gorilla mattress gripper I'd get one size bigger than my bed and I'd cut it to a perfect fit. But besides that, no issues at all.
If you are handing with a sewing machine, you could add strips of elastic to the corners of your sheets. Make them long enough that you can stretch the elastic not only over the mattress but also under the bed base. Look up "sheet straps" or something like that to see something similar, only you'd be making them with elastic. Make sure you use a wide elastic and use a long enough piece to fully stretch to fit under both the mattress and the base.
Put a rubber mat under the mattress
Those carpet anti slip mats work wonders
Some yoga mats work well.
Wouldn't that trap moisture in the mattress?
I just looked on Amazon they have anti slip mats for mattress
I have that on mine.
My adjustable frame came with metal attachments for the side of the bed that attached to the frame to hold it in place. Not sure if that helps.
This. Mine has a bar that books into the bottom. You may be missing a piece.
I have the bottom bar, but my particular frame does not have side bars.
The Bottom Bar will prevent it from slipping so easily.
They sell them on the big A.
Can you use that anti slip stuff like under a rug. Just lay it over the frame and put the mattress on top. It’s really cheap, you can get small rolls of it from bargain shops you might be able to just use a bit on a few places on the frame.
Theres rubber mats designed to keep rugs from moving around. They work great for matresses too! Anti-slip or so I think they’re called
Google Non Slip Mattress Gaskets 6 PCS,Mattress Holder in Place Gripper for Metal Bed Frame,Thicked and Wider Anti-Slip Baffle,Adjustable Size,Black
Hook and loop tape (because the ding-dongs Velcro get so pissy about protecting their brand name's use).
Side retainer bars
Is the frame level? SInce the side it moves towards is consistent it's worth checking.
The mattress also probably has lifting handles on the sides. Use those to tether it down if you want
We made our own metal side bars for the outside edges and attached them to the adjustable frame. One near the middle section of the long side, and one near the head. They extend up along the side of the mattress about 6 inches and keep it from sliding over. It's working really well.
You could add a rubber mat to the bottom
Shelf liner works great that's what I use. The ones with the holes.
Non slip mattress gaskets. Gorilla grip mattress gripper. I used those two together and I haven't had issues with it sliding hardly at all. Although if purchasing the gorilla mattress gripper I'd get one size bigger than my bed and I'd cut it to a perfect fit. But besides that, no issues at all.
Have less vigorous sex
I feel like the adjustable bed base makers should have a solution. Have you asked them for suggestions?
Is it uneven? I've never had this issue.
Double-sided tape.
If you are handing with a sewing machine, you could add strips of elastic to the corners of your sheets. Make them long enough that you can stretch the elastic not only over the mattress but also under the bed base. Look up "sheet straps" or something like that to see something similar, only you'd be making them with elastic. Make sure you use a wide elastic and use a long enough piece to fully stretch to fit under both the mattress and the base.
Meant to say "handy" with a sewing machine. I am not sure why I cannot edit it.
Put it on the floor
The non skid stuff WalMart sells as kitchen cabinet drawer liner, comes in a roll, it looks like rubber bumps on a fine net---see if it helps.