proper way to replace post from post and pier foundation?
First, let's make sure we're talking about the same thing. There's two types of posts in the picture. One kind sits on a deck block; the other is embedded in the ground, in what looks to be a sonotube filled with concrete.
The effort to replace each kind differs greatly (assuming the replacement gives you exactly what you started with).
First of all, if we're talking about a house and not a deck, deck blocks are insufficient. You need a footing that rests as least 12" below grade (I believe Sacramento has no frost line). So, if this is the kind of thing you have under your house, what's probably happening is that one contractor is telling you he can do a straight replacement. The other contractor is probably being more conscientious and telling you there's no way he's going to do a straight replacement. It's also possible he may have determined you have an insufficient number of posts (i.e., your beam span is too large). So, he's willing to put in proper posts and footings and decrease the beam span by putting in one next to each failed one.
This is all speculation on my part. I don't know exactly what you have under your house (that's not an actual picture of your crawl space) and I don't know exactly what each contractor said to you. But, I'm providing a theory as to why you may have two very different quotes. If you can post pictures of your actual situation and get a more detailed explanation from the pricier contractor, I can give you my opinion.
Last edited by cortell; 04-12-2012 at 06:48 AM.