Michael J. Knowles
P.O. Box 487
Concho, Arizona 85924

Arizona xxxxxx xxxxxx, LLC
P.O. Box xxx
Tuscon AZ xxxx

Gentlemen,
    Last month, I started to dry wall the house. I started by hanging it in the closet, then hung and finished bathroom. I am now working on the kitchen lid. I am having problems with the bottom cords of the trusses lifting away from the walls. More so, toward the center of the thirty seven foot span. I'll give you the gist of it.
    I started in the closet. I hung the dry wall, everything seemed to be normal. I continued to the bathroom. After the bath room was hung. I proceeded to mud and tape. The joint/seam between the wall and the lid cracked. I thought nothing of it, maybe to much mud or it just shrunk. I remudded. Where the trusses are running perpendicular to the walls, it happened again. I remudded. It happened again, and again. I thought that was rater odd.
    I investigated, and found that the trusses would lift during the warming of the day. As the top cords warmed up, they would pull the bottom cords up, more than one eighth of an inch at truss point number 15.
    I suddenly realized that, by remudding the areas, was causing the trusses to rest on the 5/8 lid, then the 1/2" vertical dry wall that is attached to 3-1/2 studs and intern on the slab. The interior dry wall, walls and slab have not been designed to carry this weight, nor is the truss designed to bear at this point.
    I thought, perhaps, the trusses just needed the full load placed upon them. I did so, by hanging most of the lid in the kitchen. This made no significant difference. The bathroom seam in between the wall and the ceiling is still opening and closing. This is more evident at the trusses intersections.
    The trusses look like, the computer calculated and generated representation of them. A copy is enclosed, as well as a truss.jpg/(Knowles 1.) and some digital pictures. An internet browser will open the file "Pictures.htm" or they are all in a .jpg format.
    Perhaps the computer truss design program, either KEYMARK and/or KEYSMART II and/or the structural engineer Robert G. Brock of Arizona, did not consider and/or account for the very important factor of thermal expansion and contraction of metal and the reaction upon this truss design.
    Up here, in Concho Arizona, it is not uncommon to have better than a 50 degree temperature swing during the day. I am also wondering what the reaction will be between the seasons. -5 degrees in December and 110 degrees in July, and effect upon the dry wall screws moving/working within the 5/8" lid as this movement continues.
    Evidently, I need this truss oddity resolved, in order for me to continue finishing the house.
    Your help would be greatly appreciated.

Thank you,
Michael J. Knowles