Red is a concrete foundation. Black is rotting wood foundation that needs to be replaced.
Foundation issues suck. House has foundation issues. Most of the foundation will need to be replaced. Part of the house currently has a wood foundation which is rotting. There is an addition which has a concrete foundation. (See image above).
I know that the wood foundation can be replaced with a pier and post foundation. They can stabilize the house, dig and pour piers, then use metal posts to brace the house at the right height.
Is a pier and post foundation the only option? Is there a way to do a concrete foundation?
Edit: The image is a top down look at the perimeter of the house. The red part is a ~600 sqft addition. The black part is the main house.
You need way more details here...
Basement or crawlspace? Do you have piers already? What's under the wood, and is the wood above or below grade?
I'm sure I need to add way more info...just not sure what's relevant.
Crawlspace. There are piers....but they appear to be wood. Wood piers in the ground, connect to wood posts/beams above ground. As expected the wood has started to rot and the whole wood foundation needs to be replaced.
This is in the PNW and earthquakes are possible, thus my preference for a concrete foundation(rather not get into the debate about how house would be effected from earthquake).
This is not a foundation repair situation...this is a foundation replacement situation.
What else can I tell you?
? I didn't know you could have a blank post...
Well that's not I typed lol
Is the house occupied? If not, can the existing floor/decking be removed to get direct access to the crawl space and supports? If so, that will make the job so much easier.
While you are at it, have you considered digging out underneath the house and creating a concrete and cinder-block basement? It would cost a bit more but since you are already doing major foundation work, it might be worth it and would dramatically increase the square footage of the house. Adding a basement would allow you the freedom to bring in large excavation machines to do the digging with.
The house is not occupied and there is access to the crawlspace.
My main concern is that I'm not sure a concrete foundation can be built underneath the house. Since it has the addition which a concrete foundation, the house cannot be lifted. The weight bearing concrete would have to be built upto the level of the house...which I'm not sure is possible.
A basement would be amazing.
I have seen time-laps videos on Youtube of a company that retrofits houses that have crawl spaces with full basements. It is pretty amazing to watch them work. They hand dig out sections at a time and pour footings and supporting walls, they then do a final pouring of the floor. They do this without lifting the house.