I've done a lot of research into them as a way to mitigate some potential concrete foundation issues we had.
You will see many posts like above saying they wouldn't do it without much information behind them.
The facts are, wood foundations can be just fine, and have some advantages over concrete in some cases.
The other fact, is they can be really screwed up if constructed by someone who doesn't know what they are doing.
Drainage is the biggest issue. A wood foundation without the proper drainage mechanisms will be at risk. Structurally, if they didn't properly secure against kick out forces, they can bow in and you can have a mess (as with concrete). If you use the wrong fasteners in treated wood, they will corrode and lose their holding strength.
For a place from 1985, it should be pretty obvious if they've had to brace it, or if it is bowing. If not, you're probably good. Pull some of the fasteners, ensure they are galvanized or stainless, and not a mixture of both.
There are wood foundations that have lasted hundreds of years. In some areas they are the majority of houses. There are failing concrete foundations all over the place. Either one will built does just fine.
|