In a week, I'll be building a 10x12 shed.
The plans call for a on-grade foundation with 6x6 skids. My property is slo
ped. From high pt to low pt is about 8 inches. I called out a guy and asked
about pouring a slab. After I got over the price objections ($3k), he and
I talked about cheaper suggestions. He said, oh, we could do Sonotube pier
s. I agreed but the project at that point stalled as I lost the person who
was going to help.
Anyways, I found another person and he said he and I would do the foundatio
n layout, digging, etc. ourselves. I told him my soil is kinda hard (clay a
nd possible sandstone). No problem, just water the area and it will soften.
I did a test dig yesterday and the water didn't drain for over an hour. Hm
m, this is gonna be tough going.
Here's where I'm at. I could go with on-grade foundation using solid concre
te blocks to level up the low spots. Not a problem for me, easy to layout a
nd make happen. Or... we could get a power auger and drill the Sonotube pie
rs. My helper who is a expert carpenter is away on vacation until two days
before we start, so I can't get his opinion.
Which way would you go? Block or tubes?
My only concern is earth movement. Earthquakes are possibility. But a rare
one. Would one would see a wood foundation come off a cement block pier in
a minor (less then Richter 2) quake? I thought of drilling into the block a
nd holding the joists with anchors. Can you drill solid block?