Actually I built one this summer. What I did was to drill 18" holes every 8', then pour the slab to include filling the holes then added achor bolts and finished building as a stick built garage. I have to concern over woodrot not termites eating the wood. Termites will eat the pressure treated wood we have today. Been in the pest control business over 20 years now and I see it all the time. Wood that supposedly would not be damaged by the termites. Anytime to have wood in contact with the soil, you are prone to termites.

Anyways, pouring the slab as a monolithic with the 18" holes is more than enough support for the size building you are putting up. Make sure you check with the local building authorities to make sure they are ok with it.

Lastly, by building mine this way I didn't incur more cost, it actually saved me a little. Especially where lumber cost are right now.

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