Do they need to be pressure treated? This is not a basement. It is a hollow concrete block wall. I closed off a window and need to add drywall. I can't tell if the furring strips are pressure treated or not.
The CMU will let moisture through to possibly mold the paper on paper faced drywall. Sounds as if you are limited to furring strips rather than set-height hat channels for your wall patch. Paint the strips all edges/sides/ends to limit water capillarity. If doing the whole wall I would suggest foamboard first, then drywall, as you are in FL; http://buildingscience.com/documents/insights/bsi-037-mold-in-alligator-alley
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