While bumbling around on the TFwiki page I found a list of definitions which did not mesh with the wiki list. Just found it interesting. I am more in agreement with the wiki pages. As an example "purlin" they are only found between rafters.
http://www.dreamingcreek.com/glossary.htmI also found a list of disadvantages on the wiki page, which I found almost disturbing. Sorry no link. Tim
