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AllGoNoShow 10-10-2006 10:41 AM

Hardest hardwood available?
I need to use wood shims in between the steel post "lally" column (and wood main beam) that extends from my basement floor to the main beam (need to shim 4-5 inches). The previous shims that were used were pine so they have compressed over the years and the floors have sagged a 1/2 inch to 1 inch.

I am going to need at least a 9 inch by 5 inch piece(s). What would be the best type of wood to do this so it does not compress much in the future? I doubt there is more than a 5-8 thousand pounds pressure on each post (house is only 1050 sq ft. 2-story but has 4 "lally" columns already in place under an 18 foot long main beam). Is oak fine for this application? Any other wood better that is not going to be overprices?



joasis 10-10-2006 12:52 PM

Oak.....and didn't I say shim it up? You can probably get 2X oak plank scraps at your lumber yard...just stack them in and you are set.

AllGoNoShow 10-10-2006 04:11 PM


Originally Posted by joasis (Post 20475)
Oak.....and didn't I say shim it up?

yes...and thats why i am doing it instead of replacing the "lally" columns :)

After a little research it appears oak has a 6000-7000 lbs per square inch max. compression strength. Considering the metal pads for the columns are 15 sq. inches wide to disperse the weigh, less than 1000 lbs psi will be placed on the shim so there should be no problem at all with compressing.

fqp25 10-11-2006 03:03 PM

Just a thought without looking into a code book: Is wood an acceptable material for shims?

redline 10-12-2006 10:14 AM

Are the columns adjustable?
They do sell columns that have a threaded adjustment.

joasis 10-12-2006 05:33 PM

Since it is existing, and nothing essentially is being changed, it would be no different then wooden collumns being used as many thousands were. Code would come into play if a structural change were to occur, and I understand the collumns are shimmed to the top. He is replacing old soft shims that have flattened out after only a hundred years or so.

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