Replacing a concrete tube lally
I have at least one (of four) Lally (Concrete filled Tube 3.5") that needs changing - the Tube seam is splitting / rusting and although OK now - should be changed in the near future). It is in a house that's about 20 years old (I know, I know it should not have gone that soon ...). I WILL hire a licensed and insured contractor to change this - but I want to better understand the procees and get a feel for the time to repair and cost ballpark.
To my knowledge (and for sake of this discussion) please assume this repair needs nothing else done (Main bean is fine, No sag, etc.). Lally bottom was installed on a Pad and then the floor was poured around the post.
So, I'm thinking that the general process will be;
- Support the beam both sides of Lally to be replaced.
- Jack it up enought to get out the top support plate.
- Cut off a foot or so of the lally.
- Chisle out around the base and loosen the pole
- Pull the pole up from the floor.
- Clean the floor base hole.
- Cut the new lally to length.
- Install lally and top plate (Plumb, etc.)
- Let down the temporary support jacks.
- Patch up concrete at base of lally - and level patch to floor.
Am I way of base here ??? If so what please??
I'm assuming a day to replace a pole ??
Cost is what ??? $500 to $1K per pole ?? More/less ??? (I know it depends on other Gotchas - but am I in the ball park ?
Anything else ??
All sounds good. Only issues that might arise is that the column is more deeply imbedded in the floor footing then you think. Just means a little more digging. And that the main beam doesn't necessarily need to be jacked up. Depends on how the two are connected. I've seen lag bolts, nails, screws with washers and nothing. Just the weight of the house on top holding it in place.
Shouldn't run more then $600-650. unless you have other issues. Materials are less then $100.
If anyone Else has any inputs/comments/suggests I would be most grateful.
The area will be supported on each side, as you listed, prior to it's removal.
However, there is no need to jack up anything to remove it.
It will simply be cut in half and then the rest of the pieces cut out, using a reciprocating saw or a skill saw with the right blades.
The pieces will be removed and the new column installed with new plates (or even using the existing top plate) as needed. Code requires that plates be 'mechanically fastened'. That means with bolts or lags.
(BTW- existing lally columns in 95% of spec homes are actually NOT installed perfectly plumb)
Thanks AtlanticWBConst. !!
By Plates you mean the metal support plates? And are you saying you must remove the plate at the bottom of the column (i.e. removing a larger area of concrete at the base to get the plate out ??) - or are you just referring to the top plate that must be mechanically fastened to the beam ??
Here's an article that covers the basics:
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