Login or Register to download the PDF version of this article. (2.21 MB)
During the building boom in northern California in the 1970s and 1980s, builders were often asked to provide houses as quickly and as economically as possible. In my area many of the houses built during that time were clad with plywood siding (T1-11), which is inexpensive, durable, and easy to install. Recently I was asked to repair the T1-11 siding on a house that exhibited all the usual problems I see with decades-old sheet siding: cracks, cupping, rot, and delamination.
The paint on this house had not been kept up, and without that protection, moisture had gotten under the surface of the siding, causing the laminations to swell and the glue to deteriorate. Then the sun dried the swollen wood, and it shrank, cracked, and delaminated.