See the Official web site on PWFs
The foundation is design to outlast the house above when install to a certified design.
The materials are fdn grade with stainless steel nails and hdg nails too.
We have 35 years of service of wood foundations right now in Michigan and expect 150 years more.
Many people do not understan the system and we can help.
Call Roscoe Clark at 810 232-5099 or www.pwfs.com Thanks