Performance / value: Building envelope question
I’m building a new home in Parker, CO and am researching building envelope options. I love all the great information I’ve read here, but I’ve found in my research that often the questions I’ve seen asked and the responses given involve products well beyond my price point. Our house is a large 2 story walk out – so building envelope costs really add up quick. Additionally, I’m looking for methods that are going to be able to be successfully implemented using average contractors (even if that means more oversight…that’s fine). House will have Marvin Ultimate Alu clad wood windows and a pretty high end hvac systems designed by a ME using JDST that has a few large zones and uses all modulating furnace and AC equipment.
The goal is the stick to a price point around 10%-15% or less higher than OSB + Tyvek + Fiberglass bat in 2×6 exterior walls.
So I’m learning toward one of three options:
1) Zip + Ownes Energycomplete/Knauf Ecoseal Plus + Fiberglass BIBS
Pros: Cost is reasonable, common skillsets for local contractors, great air sealing potential, descent insulation (r23 on 2×6 walls)
Cons: Low envelope permeability, questionable long term performance of zip system
2) Soletex Mento + OSB + Ownes Energycomplete/Knauf Ecoseal Plus + Fiberglass BIBS
Pros: Better permeability, not too complex of an installation, but slightly more so than #1. More predictable long term performance of the WRB
Cons: Envelope air infiltration will likely be higher than #1, but still should be very good with the internal air sealing
3) Barricade Thermo-Brace Red, Barricade Seam Tape + Ownes Energycomplete/Knauf Ecoseal Plus + Fiberglass BIBS
Pros: Non OSB sheathing offers better performance in the event of WRB failure. Don’t really know much about this type of sheathing in terms of other benefits. Should offer similar air sealing with taped seams similar to that of zip.
I’m in no way an expert in this area as probably evident from my post. Would love to hear what others would recommend in terms of the best value option for our build. Thank you all in advance for your insight, wisdom, and criticism!