I am looking to extend about 7-10ft on the back of my home. This would increase the square footage of my 2 bedrooms and kitchen. What I really don't need is to extend the lower half of the home. I'm wondering if the addition can be put up on columns. Almost like a very long 4 season porch but better insulation. If there is a better way I'm open for ideas.
Yes, you can do a post system for an addition. 12" to 14" diameter footers 36" to 48" deep with your posts 8' on center or less. The posts should be treated 6X6 and set on top of the footing. You need to use some sort of lift so that the wood in not in direct contact with the concrete. Make sure that your top bracing is adequate. All your Deck/ Floor framing should be treated and fastened with stainless steel bolts and screws. For under the decking use marine plywood facing the dirt, then insulate than install your 3/4" subfloor. Make sure when you attach your ledger to the house you use treated lumber and stagger your 1/2" X 4" SS bolts 16" on center. Submit this to your local building dept. It should be fine.
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