How do I get my stick-framed house in Tampa, Florida, to breathe and keep the heat out?
We live in the Tampa Florida area (latitude 28, zone 2) in a Manufactured Home. The house is 46 feet long. All of its front is facing due east with absolutely no shade. The exterior wall temps range from 110 to 120f in the very long summer. Manufactured homes are built to HUD standards and as such are framed differently than a normal site built home. I have provided a pdf of the typical framing anatomy for our home. Ours is slightly different in that we have two 3/0 windows in the bedroom (the one pictured has one.) and a smaller bath window higher ours is also wider. Item #13 is 2x4s not 1x4s. Item # 9 is 3/4 plywood. and item # 18 should follow #17 and is a typo in the description. That said, plans are to remove aluminum siding, remove 2″ fiberglass insulation in all stud bays and install Roxul comfortbat in lieu. new cladding to be 5/8″ double sided HDO 4×8′ sheets installed vertically. The HDO is 100% water barrier with a vapor perm of less than 0.1. It shall be attached to meet new wind load uplift etc. required. The interior of the home shall be structurally sheathed in APA rated 3/8″ sheathing staggered horizontally (except first 2′ at every corner shall be continuous vertical panel), nailed and glued for shear. The home sits on concrete pier (blocks) which are 4′ OC on top of 17″x 22″ ABS base pads on what was tested and assumed still is 1000 PSF soil conditions. Every 5′-4″ OC is a galvanized earth anchor as well as 4 longitudinal anchors at each end of the house + three roof over straps and earth anchors.
The objective is to feel safe in hunkering down during a cat 3 hurricane and cutting our energy bill significantly while increasing comfort. My dilemma is how to prevent thermal bridging (studs), provide R 16 or better insulation (total wall except windows) and let the interior water vapor escape the walls. With the way manufactured homes are framed, bridging control and vapor control are the real bugbear for me.
The other two pdf are self explanatory. form APA.
Best Regards to all in advance for my laughable situation,