cabin foundation

Started by eighthdoctor, January 25, 2013, 10:01:20 AM

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eighthdoctor

Hi Everybody
its been a while since my last post we have finely settled on the pier and beam foundation but not sure on the span for the sona tubing the cabin we be 20 x 40 with 3 beams two on the outside and one in the middle is there a good book on this foundation or web site how to use string to set up the foundation so it is level

thank you all
eighthdoctor (watch Dr who)

Redoverfarm

I would set batter boards up to get it square and at the right elevation.  A good set of batterboards with string lines IMO is the only way to go.  I put screws into the batter boards to position the string lines.  I can take down the lines and put them back up easily.  You either need a builders level or water level to get the batter boards horizontal at the correct heigth.  In your circumstance you will need 4 corner and then and probably 2 sets of  intermediate one to run the center with. Of course that is all dependent on how many piers you use for the center secrtion.  The string on the corners crossing the middle string will determine the location of the end(middle) piers. 


itpdk9

I am in the planning stages of my 20x40.  I am going to use 6 post spaced 8 feet apart down each side.  Im sure more experienced people will answer but thats my plan... ;D

eighthdoctor

Thank you for the post
Where in the country are you building your cabin we are in Maine and the frost is my concern and the reason I am doing the middle footings is the concern over the floor sagging.

Redoverfarm

Quote from: eighthdoctor on January 26, 2013, 08:46:46 AM
Thank you for the post
Where in the country are you building your cabin we are in Maine and the frost is my concern and the reason I am doing the middle footings is the concern over the floor sagging.

Do you have plans to canterlever the beams on the outside?


UK4X4

You need to start from the top down

Snow load ?
1 or two floors ?

from that you can calculate the basic loading on the beams

Then you look at what spacing for the posts and the beam strength required

Then you need the soil type and support pressures expected - frost depth

with all the calculations you then see if you need small footings or large footings and how many of them