I've seen these recommended as a means of reducing condensation. Do they need to fit the mattress exactly, do they scratch the wood base as they flex and has anyone tried them in a V berth?
You'l need to cut them to shape from both ends to retain the curve, otherwise they sort of don't work and loose the spring as they are made from a formed laminated curve, ours have been in place for 5 years with no complaints.
They also do/did a set for double beds but I mounted the batons onto a piece of 100 x 25 to secure them in position and raise it a bit more, as the mattress will sink into the gaps between the batons.
An expensive but very effective alternative is VentAir mat from Hawkehouse. We suffered badly living aboard in the UK over winter. Problem completely solved using it.
We also use the Ikea slats, with a little adaptation (easily done with some basic carpentry) to fit.
As said, they work very well - and inexpensive too.
We have a sprung mattress on our bed but the guest bed and side cabin bunks both have foam and they are very comfortable and appear to work just a well
Another recommendation.
We bought the double bed size and cut them to fit our forecabin V Berth. We have a bespoke spring mattrees with a breathing bottom layer so we have no problems at all.
It does restrict our ability to get at the underbunk storage areas though.
I have thought about getting some willow woven to it the fore cabin, what do you think? Concept is that we can have it made to measure at reasonable cost, it's green and if it does't work it'd be firewood or the winter!
I use an anti condensation matting 2 layers thick. I would love to be able to tell you where it came from but cannot remember. Google anti-condensation mat you'll get it there. Not very cheap but it works "as it says on the tin". On reflection, I seem to remember spending in the region of £150.
I brought some lengths of copper pipe insulation. (rubber not foam) Came with sticky on either side of the split. Glued down both sides to the bunk base in a 'n' shape. Separated by about a foot. Seems to work. About £10 for the lot.
Used capillary matting underneath the bunk on my previous boat and that worked very well but didn't have to contend with much damp. Next boat was very damp underneath the bunk in aft. cabin. I assumed that the large tank of fresh water underneath didn't help as it provided a nice cold surface for condensation.
I laid down reflective, foil type insulation on top of the tank, under the locker lid. Then I put down capillary matting as used on previous boat. Very effective and never any sign of damp when sailing West coast of Scotland. Pretty cheap solution and it seems to work on my boat.
I'm not sure what sort of slats Ikea sell in the UK. We bought ours, in Oz, 5-7 years ago. They are sprung curves and were slotted into a pocketed rubber tape. The tape was bed length with rubber pockets for the slats. We needed 2 sets to suit a queen berth. We needed to cut one set back slightly as the berth is not quite rectangular. They work a treat, we use a foam mattress, I think its a genuine Dunlopillow. Here Ikea no longer sell 'our' kit you need to buy a frame to go with them.
One minor issue. The slats lifted the mattress above the, very low, fiddle and despite being a catamaran the mattress would fall off the berth in big seas (leaving the slats behind)
I'd recommend the curved slats with whatever tape is available, the frame (here) would need be discarded.
The Ikea slats I bought for a single bunk now reside in the sole of my Avon Rover.
Just the right length with the rubber pocketted tape for the width of the dinghy and much lighter than plywood.
We bought the cheapest bed slats from Ikea, about a tenner a pack, flat not curved and cut them to size to fit under our custom mattress in aft cabin. They have been brilliant, cured all condensation problems. We had to screw them down to stop them sliding out of place, and if you need to access the under berth lockers this is just a minor problem. We are very pleased with them and can definitely recommend.