Historic Structure

Post by ken » Thu Aug 17, 2006 2:49 pm

**8/17/06

How to preserve a historic structure? (ex. 100 years old wood workshop)

-Location Boulder, CO
-Roof rafters (Note: Not using rigid board)
-Barn-roof like framing method (Where is the collar tie?)
-Birdsmouth cuts (What are they?)
-Bracing requirements (Let-in brace?)
-Wood-to-post connection (Is this ok?)
-Post connection (What do you think?)

http://primalkey.com/_blog/img/histwood1-081706.jpg

http://primalkey.com/_blog/img/histwood2-081706.jpg

http://primalkey.com/_blog/img/histwood3-081706.jpg

http://primalkey.com/_blog/img/histwood4-081706.jpg

http://primalkey.com/_blog/img/histwood5-081706.jpg

http://primalkey.com/_blog/img/histwood6-081706.jpg

http://primalkey.com/_blog/img/histwood7-081706.jpg

by ken » Thu Aug 24, 2006 10:22 am

**8/24/06 Further Readings for Preservation of Historic Structures

Anyone, who is interested in Preservation of Historic Structures, can read the following:

**Architectural Preservation Institute (at CSU)
http://api.colostate.edu/projects/index.htm

**The Association for Preservation Technology International (APT)
http://www.apti.org/

by Bruce Pooley » Sun Sep 03, 2006 3:30 pm

How can it still be standing?

The rafter ends but together and transmit the load, normally a ridge board is used to keep the ends aligned. In this case, I appears that toenails are doing the job.

Collar ties are installed resist the thrust forces at the ridge rafters. In this case, the dead load is not enough to cause much thrust. Any snow load must be minimal (snow melts or slides off roof almost immediately) and therefore not enough load to push the walls out.

Birdsmouth cuts are acceptable as long the the entire cut is supported on the post or other supporting member. Overhanging to the inside can lead to splitting of the rafter.

Post and foundations shown in the photos are customary in the old days. Today they would be required to be mechanically connected with straps, metal connectors, etc. The foundation would have to be more substantial.

Does preservation allow for adding new metal connectors to sides of wood members, or would all reinforcements have to be concealed?

by ken » Tue Sep 05, 2006 2:48 pm

For this particular case, the preservation allows the galvanized metal connectors to be used (heavier gauge is needed) and all additional reinforcing has to be concealed.