The use of retes boards is to allow a range of different temps and humdities. I do not say, Retes stacks, as they do not have to be stacked or stacked a a certain way.
Retes boards are BOARDS because they are made of wood. Wood is a good insulator, which is why its used. It allows for Different temps at each level. Stone on the otherhand heats up and does not allow CHOICES. Also, on a side note, more monitors have been killed by using rock/stone in cages then any other material.
The stacking of retes boards allows for layers of temps, from on top the highest level, say 165F to under that board, of say, 140F, to 100F under the next layer, to 80F or whatever the substrate is, under the layers in the substrate. They can be stacked in many ways, offset, tilted, vertical, etc. And several ways in one cage is BEST.
This is what allows choices, The thickness of the boards determines how much insulation occurs. Thinner, equals less, thicker equals more.
Most reptiles, have a texture preference, that is, in nature, they perfer to use shelters with smooth surfaces. As opposited to rough stone or rough stickery wood. So sanding and painting may be needed depending on the type of wood you purchase or acquire.
I personally like to use old weathered wood, like what you find snakes under in nature. Which is where the idea for Retes boards came from.
So, Retes boards are suppose to have the hottest temps on top the the highest level, and the coolest temps under the bottom levels. They should be offset so that there are tight spaces between the layers and each layer has several insolated hiding spots.
So when folks like Bob or others use wood stacks in other ways, you know, in the cool part of the cage, with no heat on top and not into the substrate. And are stacked like some modern office building and have holes drilled in them for some dang reason I do not understand, Please do not call them retes boards, call them useless board piles. Use your name in front or something. If you wish.
Like any tool, a Retes board and stack of retes boards, has a use and is to provide temp and humidity choices, and secure shelters. If it doesn't, its because the keeper is not using the tools right. That is like, using a drill to loosen a nut.
So please, if your going to use Retes boards, find out what they are suppose to do before you go saying naive things. Oh by the way, if they are splinters on the wood, SAND THEM OFF.
Also, Retes boards are a simple easy way to accomplish those goals, there are many many other ways. And not all species are meant for their use. Many of the larger species rub their backs as adults, but as neonates, these boards are used well. Thanks Frank RETES.



I think the Aussies who keep Monitors outdoors in their yards construct pit cages for this very reason - to allow cool retreats that won't cook the captives. Problem with that where i live on the water......it's seawater 7-8' down here and we get some heavy raining for months on ends here in late summer. 



