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What Is T-11 Siding?

T-11 is a mispronunciation of T1-11 siding. T1-11 siding is a laminated plywood panel with vertical strands running through it that give the product a rough-sawn appearance. T1-11 is a relatively inexpensive siding material.

Grades of T1-11

OSB is a type of wood composite used to make T1-11 siding.

There are two grades of T1-11 siding; plywood and OSB.  Plywood is slightly more expensive than OSB but provides better performance and more finishing options.

Finishing Options

Plywood T1-11 can be stained, or primed and painted.  OSB T1-11 must be primed and painted. On either product, it is important to finish the edges to prevent water from soaking in and expanding the product. 

Appearance

T1-11 is a panel imprinted with vertical channels that give the finished product the appearance of rough-cut siding. 

Maintenance

Proper maintenance of T1-11 is essential to product performance.  Left unfinished, the product is susceptible to water damage. Maintaining paint or stain on T1-11 will keep water from soaking into the board and causing it to expand.  Stain should be re-applied every three to five years, and paint should be re-applied after about 10 years.

Performance

While it is slightly more expensive, plywood T1-11 tends to perform much better than its OSB counterpart.  OSB, which consists of a series of wood flakes bonded together with resin, is much more prone to water damage than plywood.

References

About the Author

Robert Howard has been writing professionally since 2004 and writes a weekly column for the "Synthesis," a Chico, Calif.-based newspaper. He maintains a blog and has published articles and works of fiction in a variety of different print and online magazines. Howard holds a Bachelor of Arts in visual arts from the University of California, San Diego.

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