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Miami — Tier-1 Pillar

Miami Insulation + Vapor Barrier — Hot-Humid Climate, Spray Foam, R-Value

Miami insulation reality. Hot-humid climate inverts vapor-barrier rules, closed-cell spray foam dominates retrofits, FBC minimum R-30 ceiling + R-13 wall, ice-dam not a concern but mold-risk is. $4K-$18K typical.

~1 min read·Updated 2026-04-23

Miami's hot-humid climate reverses vapor-barrier convention. Vapor drive is inward from the exterior, not outward from interior heat. Closed-cell spray foam (2 lb/sqft) simplifies the assembly and handles the humidity. FBC minimums: R-30 ceiling, R-13 wall, R-0 floor (slab-on-grade typical).

Frequently asked questions

Why is Miami insulation different from the Northeast? Vapor drive is inward from hot-humid exterior, not outward from heated interior. Traditional kraft-face fiberglass on the interior can trap moisture in the wall cavity — closed-cell spray foam is the durable retrofit.

How much does Miami spray foam cost? $3-$6/sqft of surface area. Typical attic: $4K-$12K. Full wall + attic gut retrofit: $14K-$28K.

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