Expert: Ted Barnhill (Principal, Design45 LLC) - 1/6/2008

Question
We have a three season "camp" in Pennsylvania with seasonal issues of temperature contraction/expansion and humidity. We recently rebuilt the flooring systems, joists, sub floors, flooring etc. and we are now thinking about replacing the walls which are currently various types of wood paneling. Camp is opened in early May and closed in early November and has no heating system. We have been looking at using T-111 siding to replace the paneling....T-111 appears to be sturdy and we like the rustic look of it. Can we use T-111 siding for interior walls without worry? Should we stain and/or polyurethane it? If we stain and/or polyurethane it will it bring out the grain..we don't want a bold grain for all the walls as it would be too overwheming...Will it be maintenance free  if we stain and/or polyurethane it?  Are there any concerns about using this siding inside the camp? chemical throw off, threat of bugs ...we currently have a bug company come in three times a year to treat inside and out...Are there other matierals that may be better suited for a camp environment?

Answer
Debi-

T-1-11 is a generic name for exterior grade sheathing/finish material with vertical grooves routed into it.  It can be either plywood or OSB (made of woodchips), and is almost always made with formaldehyde-based glue.  As such, it does offgas, possibly for years, and isn't a good choice for an interior finish if you are concerned about indoor air quality.  

There are many types of finished plywood panels, including some very attractive hardwood panels, that will prove very durable, and can be stained or polyurethaned to your desired look.  The following link describes a major manufacturer who  offers formaldehyde-free panels:

http://www.buildinggreen.com/auth/productDetail.cfm?ProductID=1144

The Building Green website in general is a great resource with non-biased information on many building materials.

Yes, generally poly will bring out the grain; on most woods a medium-dark stain will visually diminish the grain.

You may want to look at "cabin-grade" pine paneling.  This economical choice has more knots and imperfections, which may be a boon for your rustic look.  As solid wood, it will be as durable as any panel product and can be finished to your liking.

Good luck.  -Ted