@JacobZ Thanks very much for the reply. I understand it isn't perfect and the risk of rot is higher. However, it is under cover and it is fairly comm ...

Thanks @EricL It has confused me a little more though. "because timber is a natural product it absorbs moisture, and sealing the whole timber in bitu ...

I'm building a low level deck over a concrete slab. There is minimal height so I will be laying a 70 x 45 on its side and using around a 6mm spacer wh ...