I've been building a garage on weekends and am ready to install the exterior pre-hung man door. What I have done so far is frame the rough opening and then fold the house wrap from the exterior walls over the rough opening edges (not sure if that is recommended but it seemed like a good idea). I may peel that back and use blueskin or vycor underneath and than reapply the house wrap back over... tbd
. Anyhow I have the following questions:
1. The door is pre-hung and I plan on installing on the concrete garage floor and seal with caulking. Not thinking about this before hand I did not account for perhaps putting a PT piece of wood underneath the threshold. I only accounted for 1/2 inch space at the top of the door. Can I install directly on the concrete? If not what is recommended?
2. I notice that from top to bottom the RO is slightly out by 1/4 of an inch (sorry I'm a DIY' er). Since the door has to be flush and plumb can I hide this imperfection by planing the back of the trim?
3. The metal threshold at the bottom of the door is hollow (about 2" x 32")and made of what looks like aluminum that juts out about 1inch. This doesn't seem very strong for people to step on. Since the door jam needs to be flush with the exterior wall can I just stick in a piece of 1x3 and trim it to the 2" width and 32" length for additional strength? And perhaps PL it to secure the wood? Any better ideas?
Not sure what to do next so any advice would be greatly appreciated. Finishing is way more difficult than framing in my mind.