TOOLS, CONSTRUCTION, ALTERNATIVE ENERGY > What are you building?

DIY Foundation Advice

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TexasRedNeck:
I know some of you may be more experienced in construction than me.

I'm wanting to build a 16x24 wood framed building on my weekend place to use inititally as a dedicated reloading/gun smithing room.  I want to build it well so that later, if I decide to convert it to a Casita ( mexican word for little house) with an efficiency kitchen and bath with a loft for guests, I can.

For that reason I want to make sure I build a decent foundation.  I've been researching on the webz and can't quite decide how to go.

I don't want a slab - makes adding plumbing later too hard and any settling would require too much work.

Looking for design help.

I thought about 3 glue lam beams the long way on 4x6 treated posts sunk in concrete, with a 2x6x16 footers over the top leaving 8ft span, which could be on 24 inch centers to give me 20psf load rating for #2 yellow pine.  I would then use 1 1/4 subfloor plywood.

Keep in mind this is South Texas so there is no freeze/thaw concern with depth of footings.

1.  Is this a good plan?  If so, what size glu lam and spacing on the footings for a 24ft beam to support this building.
2. Is there a simpler cheaper way to acheive the same result?

The building will have either 10 or 12 ft stud walls, 6/12 pitch roof.  Metal roof and hardiplank finish with a loft area in the back 8 ft of the building.

Dawg25385:
How bout concrete footing and blocks around the perimeter, then run a beam down the middle on posts And instead of 16' joists, just do 8's since they'll terminate at the beam anyway


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TexasRedNeck:
Thought about that.  That's the way houses are built.  I'm not sure I like laying concrete block that much.  Never was much of a mason.

Dawg25385:
Then do columns of concrete piers, with steel beam saddles set in them (or bug all thread so you can tweak height). You can get those cardboard "form" tubes. Then 3 main beams, with beams saddled on the long ends to tie into the 3 long beams, obviously with one down the center. Then 2x8x8 or 2x6x8 joists in between with joist hangers (depending on how strong you need), to achieve flush top to sheet over with your TG plywood subfloor. You can clad the perimeter with fascia or tin or something to protect from weather when siding.

I would prefer closer OC with smaller lumber, via bigger OC and larger lumber, that's just me tho. I.e. 16" OC with 2x6 vs 24" OC with 2x8, but again that's just me. More joists and more hangers, vs marginally more expensive 2x8s... Again, just how my brain works.

Btw, I assume this is off grid style. I'm not a contractor obviously lol


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Dawg25385:
Edit: 2x6 is prob too small to span 8' even with smaller OC... Dunno


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