New answers tagged lumber
If you look closely at the boards on the inside, you will see they are overlapping, the top edge being behind the bottom edge of the board above (behind when viewed from the outside). This is standard clapboard type construction (although many modern clapboards have a tapered upper edge and the overlap is much greater). Rain tends to drip off the lower edge ...
The spikey washer needs to go between pieces of wood. I doubt its usefulness, since the strength is either going to come from the bolt in shear, or friction between the wood surfaces, depending on how tightly it's bolted. The teeth won't fix poor clamping. A lockwasher needs a lot of compression to function properly, it's really intended for metal. If ...
As requested, composite really needs the tighter spacing. It will sag and feel really spongy at 24".
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