How well sealed should exterior foam board be?
External Rigid Foam Insulation Board Question: How well sealed should the foam board be?
I am building a house on the Gulf Coast with 7/16 OSB sheathing on the exterior walls (required by code here). I plan on using Tyvek “DrainWrap” on the OSB then Install R5 Dow Foam board over the Tyvek. The cladding will be brick. I have most of the details about sealing and taping the foam board figured out via various GBA, EEBA and BSC publications but am still unsure if I should caulk and seal the top and bottom of the foam board at the top plates and the sill plate. I understand the need to prevent air flow behind the foam boards to achieve max thermal benefit but is there a need to leave a “path” for a little ventilation behind the foam board for drying purposes?