Thought I would share this link with you regarding TS housing. It doesn't specifically speak to porches on the wooden boxes, but he does address perches. I guess a perch may be better than a porch
http://www.treeswallowprojects.com/boxmount.html
Also thought I would show you what I plan on doing this year. I'm using gourds with (S&K BO-9's) that have a TS specific entry plate and I was planning on adding a porch (as shown in photo) unless I hear from more experienced TS landlords that porches are a bad idea
D'Nese,
I apologize in advance if you've already read this, but Dr. Dan Drew has some great suggestions on keeping TS's in their own boxes and away from the PM housing.
http://www.drugfreeworkplace.com/~Dan/T ... GENCY.html
Again, I hope I'm not duplicating something that you've already know about....
EDIT: Sorry D'Nese, I just realized that Dr. Dan's guidelines were already referenced in this thread. My bad.
