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naehring2000 03-11-2010 05:36 PM

question for builders in massachusetts
I am planning on building a shed in the next couple months and after back and forth emails with my local building inspector he said for the sized shed I want with a concrete slab floor that 10" sono-tubes would be an acceptable footing for the slab.

My question is how do I pour a slab on top of sono-tubes? From what I can figure, I would dig and fill the sono-tubes to exactly level across all tubes excavate 2 feet of dirt from the middle and fill with 2 foot of 3/8" gravel, build a box around the tubes to pour the slab?

Does this sound plausible?

Scuba_Dave 03-11-2010 06:17 PM

Is this going to be heated ?
Attached to the house in some way ?

My pool cabana doesn't have anything under the slab
I added on 10x10' to the cabana & just put in a ~12" deep foundation to build the walls on

naehring2000 03-11-2010 06:50 PM

nope, free standing structure, i will have a wood stove in there for heat, the inspector up here said anything over 192 sq ft needs footings below the frost line

Bondo 03-12-2010 08:12 AM

Ayuh,... A floating slab, with parimeter footings would work around here,...
But anyways,...
Excavate the area of the slab, Dig out,+ install the sonotubes where ya want 'em,+ then pour the Whole thing at once...

Semi - pro 03-14-2010 07:17 PM

My experience with Massachusetts and sheds and building inspectors is that your inspector is assuming that you will have a wood floor on your shed. The floor is attached to framing which is attached to posts that are attached to the sonotubes.

In Massachusetts, small slabs can be "heaved" by winter frost. This might be particularly bad if your stove pipe disconnects because your floor slab moves and your sonotube supported structure does not.

Consider a meeting, in person, with your inspector. Since you need a building permit from the inspector, he'll list many of his requirements.

Sometimes your local (not big box) lumber yard will give you detailed guidance, advice on working with the local inspector, maybe plans, and even a "lumber package" quote. Ask who might be available for this help and when they could help you. You'll get the best advice when the staff is the least busy.

Good luck!!

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