Help with rainscreen options and cost for insulation on 1970s remodel
Hi, I am in Zone 4, Portland, Oregon.
My existing 1970’s home is two stories with 2×6 framing with ) insulated walls(probaby still R13 in a daylight basement. Top floor main living room has 2×4 walls (R13). Existing Sheathing is Fiberboard sheathing (Cellulosic Fiber Insulating Board,).
I am tearing off existing combination of T111 and some other wood composite lap siding and installing a new rainscreen + fiber cement cladding, + new windows.
My Questions are:
1) What are the best cost effective option for a rainscreen layering if my fiberboard is intact and re-usable?
WRB+ 2″ Roxul CIS + furring+ fibercement cladding?
2) what if my fiberboard needs replacing? Should i then go with something with integrated insulation and WRB? What is least labor overall?
Option 1) Looking at Zip R System that includes Polyiso layer + furring + cladding.
Option 2) demo any damaged Fiberboard, install OSB or Plywood + 2″ Roxul CIS + Cladding
Any issues you can think of?
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