pistolpete wrote:may be it's the fact that you mentioned structural applications and drywall screws in the same line that has me confused. If you were referring strictly to attaching the luan, then you are right. I am just trying to make sure King Crabb gets quality advice.
He is supporting ~52 gallons with this stand.. I am suggesting that given the very low loading on the sheet rock screws, it isn't an issue. I am also stating that wood OR sheet rock screws would be sufficient.
Sheet rock screws WILL break IF over torqued or bent at 90 deg angles. Based on this application & the screws embedded into 1.5" of wood, there is very little probability that the screws can be bent. The only way this would/could occur is if the support leg and braces bent/bowed/collapsed to the point that the screws would bend to the point of breaking.. Same things would happen to wood screws as well.
Now, if you want to debate the relative strength of lag bolts,nuts & washers to wood or sheet rock screws, I will agree that there are significant strength differences. Significantly in favor of the lag bolts.
I have built several stands supporting as much as 180 gallons using sheet rock screws without failure. If designed correctly, the lumber is supporting the weight - not the screws. The way it should be.
Sorry Crabb for the hi-jack.