PSL Custom Wine Cellar handles wine cellar insulation for new builds and older cellars that just cannot hold their temperature. Insulation is the part nobody sees once the racks go in, yet it decides how hard the cooling unit works every single day in Port St. Lucie heat.
Heat and moisture usually sneak in through spots like these:
Most rooms get closed-cell spray foam or rigid foam board, which adds R-value and acts as a vapor retarder in the same step. Walls are typically built to R-19 or better and ceilings to R-30, with every seam taped and every penetration sealed so the barrier stays continuous.
Before the walls are closed, each job gets a thermal imaging scan to spot gaps the eye would miss. Cellar owners in Port St. Lucie, Orchid, Vero Beach South and Florida Ridge have used that extra check to cut the runtime on their cooling units.
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These design concepts show how better insulation fixes hot spots, sweating glass and overworked cooling units in very different rooms.

DESIGN CONCEPT · ST. LUCIE VILLAGE
A wine bar in St. Lucie Village kept 900 bottles in a block-walled back room that baked every afternoon under a flat roof. The concept furs out the walls with 3 inches of closed-cell spray foam, adds an R-30 ceiling under the roof deck and hangs an insulated steel door with full gaskets. The same cooling unit that once ran nonstop now cycles off for most of the day.
Estimated budget: $21,500
Estimated timeline: 3 to 4 weeks

DESIGN CONCEPT · SAWGRASS LAKES
This Sawgrass Lakes cellar had single-pane glass on 2 sides facing a sunny great room, which left the front racks 8 degrees warmer than the back wall. The plan swaps in double-pane low-E glass, adds R-19 insulation and a vapor retarder in the shared walls and seals every outlet and light can. Temperatures across the room now hold within a single degree.
Estimated budget: $18,900
Estimated timeline: 2 to 3 weeks

DESIGN CONCEPT · EASTLAKE VILLAGE
An Eastlake Village homeowner built a 250-bottle cellar against the garage using standard drywall and no insulation, and the bottles felt warm by noon. The concept opens the garage-side wall, fills it with closed-cell foam and adds a rigid foam layer to the ceiling before finishing with moisture-resistant board and a weatherstripped exterior door. The room now holds 55°F straight through summer.
Estimated budget: $9,600
Estimated timeline: 1 to 2 weeks

01
Restaurants, wine bars and shops often store wine in rooms never meant for it, like back offices or block-walled storerooms. Those spaces are furred out, foamed and sealed so the cooling can keep up with constant door traffic.

02
Closed-cell foam or rigid board in the walls slows the heat coming from garages, exterior walls and sunny rooms next door. R-19 or better is the usual target for cellars on the Treasure Coast.

03
Attics here easily top 130°F in summer, and that heat pushes right back down through a thin ceiling. An R-30 ceiling or better keeps that load off the cooling unit.

04
A vapor barrier on the warm side of the insulation keeps humid air from soaking into the walls. Every seam is taped and every outlet sealed, so moisture has no shortcut in.

05
Single-pane glass and hollow doors are often the weakest spots in a cellar. Double-pane low-E glass and insulated exterior-grade doors with full gaskets close those gaps for good.

06
Older cellars built with standard drywall and fiberglass can be upgraded without starting from scratch. The racks come out, the walls are foamed and sealed, and the room goes back together.
Thermal imaging check: Hidden gaps are found before the walls are closed.
Closed-cell foam as standard: More R-value per inch, with a vapor retarder built in.
Continuous vapor barrier: Every seam taped and every penetration sealed.
Lower cooling bills: A well-insulated room lets the cooling unit cycle off instead of running nonstop.
Insulating and sealing a closet or small room usually runs about $3,000 to $8,000, while larger rooms and full retrofits run $9,000 to $20,000. Removing old drywall, adding a thicker ceiling layer or going above R-30 raises the price.
Most new cellars are insulated and sealed in 2 to 4 days. Retrofits that remove and replace drywall usually take 1 to 2 weeks.
Closed-cell spray foam or rigid foam board, paired with a 6-mil vapor barrier on the warm side of the wall. Both handle moisture far better than fiberglass batts, which can sag and soak up humidity.
Plan on at least R-19 in the walls and R-30 in the ceiling. Rooms next to a garage or under a flat roof often benefit from going higher.
Yes. Insulation and vapor barriers can be retrofitted into existing cellars, often alongside a cooling or humidity upgrade, with the racks coming down while the walls are opened up.
Yes. The 2-year workmanship warranty covers the insulation and vapor barrier installation, so any gaps or failed seams from the install are fixed at no cost.