You've given me thoughts to consider. I will need to re-examine the weight factor and perhaps reinforce the bottoms. I was calculating weight of the soil and each square foot of floor would be supporting 65-70 lbs. A 1' wide stretch of the 3' span would then need to hold around 200lbs. Of course weight is a very rough estimate and changes on moisture content.
Good to think about that now. When the soil is wet, it gets a lot heavier. Add to that, the wood will soak up some water and lose strength over time. I'm just saying that my 2X4 (8 square feet) elevated beds were a lot heavier than I thought they would be. Your bed is 3X6 (18 square feet) and will be more than twice as heavy.
I did watch the entire video. I get the SIP idea but that's too much hassle for me. I may revisit the idea in the future but for now I'm not keen on the expense or extra prep. I appreciate you sharing the idea though. I had not heard of that concept before.
Yes, there is a lot of work up front and to build a proper sub-irrigated system is much more costly than a typical raised bed. It's not for everyone and I really don't see many people using them, due to both cost and complexity of construction.
Although my sub-irrigated elevated planters outperform all my other beds, I can't afford to build many of them and most of my gardens are typical raised beds using the hügelkultur method of using wood on the bottom half of the garden beds. Much simpler to construct and much cheaper for the build.
Still, all knowledge can be valuable and there may come a day when that type of sub-irrigate system may make sense for you.
Instead I'll have the beds on a timed drip system similar to what I do for all of my potted flowering plants. I think I'd need to feel a lot more ambitious to tackle a SIP system.
That sounds like a good plan. I don't have water conservation concerns (I live on a lake) so I just set a timer on my garden hose for watering my raised beds. If I was living back in California with water shortage issues, I would be using a drip system to conserve water.
Hope you keep the thread updated with your progress and some pictures of everything when the plants are growing.
In that spirit, here is a picture of my elevated sub-irrigated planter full of beans. I got more beans from that 2X4 planter than I ever got out of my main garden with 8X8 patch.