Cold storage is the hardest single test for a resin floor. The slab cycles through condensation + ice + thermal shock + reach-truck wheel load + HACCP-grade hygiene + retro-fit shutdown constraints. Specifying the wrong system class — typically epoxy SL because it's cheaper on paper — guarantees year-2 cracking that closes the cold room until re-pour. Israeli cold-storage logistics is growing fast (food production + pharmaceutical + e-commerce fulfilment), and each facility runs four distinct temperature regimes that need their own floor spec. This page walks the four temperature zones (chilled, frozen, deep-frozen, blast chiller cycling), names the system class per zone, and ends with the install discipline that keeps each working through the 15-year design life.
Chilled Storage (+2 to +8 °C)
Use case
Fresh produce + meat / dairy holding rooms + prepared-food refrigerated holding + retail-bound refrigerated despatch. Moderate humidity (65–85% RH). Daily wash-down (typically warm water 40–60°C with mild detergent).
Specify
PU-Cement 6–9 mm (Sikafloor PurCem HM-20 or HM-21, Mapefloor CPU). Thermal cycling stable from -40°C to +120°C, so chilled-zone operation is well within envelope. R11 anti-slip integral; HACCP food-safe; 5-year warranty typical.
Substrate prep
CSP 5–7 per ICRI CSP guide. Substrate moisture ≤ 75% RH per ASTM F2170 (chilled zone humidity drives substrate moisture migration; verify before pour).
Anti-pattern
Epoxy SL — micro-crazing under daily warm-water wash + humidity cycling. Vinyl tile — joint failure under wash-down. Polished concrete — slip-class drops below R11 under wet conditions.
Frozen Storage (-18 to -25 °C)
Use case
Frozen food production storage, ice-cream production, pharmaceutical frozen storage, e-commerce frozen-bound fulfilment. Sub-zero substrate temperature; ice formation on floor surface during periodic door-opening cycles.
Specify
PU-Cement Heavy 9–12 mm (Sikafloor PurCem HM-22 or HM-23, Mapefloor CPU/HD). The increased thickness accommodates substrate thermal contraction without resin-side stress concentration. Integral anti-slip R12–R13. Operate to -40°C survives all freezer regimes including deep-frozen.
Substrate prep
CSP 6–7. Substrate moisture is critical at sub-zero temperatures — moisture freezes within the substrate matrix and causes spalling. Verify ≤ 75% RH before pour + maintain dry storage of substrate-prep area until pour.
Install discipline
Substrate temperature must be above +10°C minimum at pour for PU-cement cure; bring cold-room above ambient for 14 days pre-install + 14 days post-install. Total cold-room out-of-service time: ~6 weeks including pour + cure + ramp-down + thermal commissioning.
Anti-pattern
Epoxy SL — thermal contraction differential cracks within 6 months. Standard PU-cement 4–6 mm — insufficient thickness; cracking at door thresholds where thermal cycling is steepest.
Deep-Frozen Storage (-40 °C and below)
Use case
Pharmaceutical stability storage (e.g., specialised insulin storage), ice cream production hot-zone, specialised frozen-blood / cell storage. Limited number of IL facilities; specialised contractor required.
Specify
Ucrete UD200 9 mm (Master Builders Solutions — note: now under Sika post-2023 MBCC acquisition). The deep-frozen regime is Ucrete's flagship use case; thermal-shock survival to -40°C is engineered-in. Alternative: Sikafloor PurCem HM-23 with specialised additives.
Substrate prep
CSP 7. Substrate must be specialised concrete mix with insulation between substrate and structural slab to prevent cold-bridge to building structure. Insulation manufacturer + concrete specifier collaboration at building-design stage.
Install discipline
Major installation event; ~3 month out-of-service typical including substrate construction. Sika or MBS application engineer required on-site for specification verification.
Blast Chiller / Quick-Freeze (Cycling -40 to +20 °C)
Use case
Industrial blast chillers, quick-freeze tunnels, food production rapid cooling. Most demanding thermal regime — daily thermal-shock cycling. Specialised industrial environment.
Specify
Ucrete UD200 12 mm. The only commercial system rated for cyclic thermal shock at this rate. Sika PurCem HM-22 acceptable for slower cycle rates (≤ 10 cycles/day). MMA accepted at door threshold transition zones where rapid cure is required after thermal-shock damage.
Substrate prep
CSP 7. Substrate concrete mix with reinforcement at floor area (rebar mat) recommended for blast-chiller installations.
Install discipline
Same as deep-frozen + thermal cycling commissioning protocol: 3 ramp-up cycles + measure floor expansion + verify joint movement accommodation before commercial use.
Cross-zone install discipline
- Thermal commissioning before pour. Cold-room must be brought up to +10°C minimum 14 days before pour. Maintaining +10°C during cure + 14 days after. Ramp-down to operating temperature gradual: 5°C per day.
- Door threshold detail. The highest-stress zone — thermal cycling steepest between cold room and adjacent ambient zone. Joint width minimum 12 mm with movement-rated sealant.
- Insulation continuity. Floor insulation must continue under door thresholds. Cold-bridge through threshold causes substrate condensation and freezing failure.
- Drainage. Slight gradient toward floor drain (1:100 minimum) prevents standing water during defrost cycles. Drain detail must be integral to floor pour, not retro-cut.
- Anti-slip class. R12 minimum across full floor area; R13 at door thresholds where condensation accumulates. See slip class explained.
Retrofit considerations
Most Israeli cold-store floor projects are retrofits — the original epoxy or PU-cement is failing and the cold room cannot close for 6 weeks. MMA fast-cure is the only resin system that delivers same-night re-open in a cold-store retrofit context:
- MMA cures at -10°C minimum (only resin with sub-zero cure capability).
- 1–2 hour walk-on, 6 hour forklift, 24 hour full chemistry.
- Retrofit shutdown: 1 night per ~80 m². Multi-night phased installs for larger areas.
- Caveat: MMA has shorter lifecycle than PU-cement in cold-store environment (8–10 years vs 15+). Typically applied as repair to extend life of PU-cement floor by 5–7 years before full PU-cement re-pour.
See MMA encyclopedia. The cold-store retrofit pattern: MMA for emergency same-night repair, then schedule full PU-cement re-pour at next scheduled shutdown.
Brand + IL channel for cold storage
- Sika: Sikafloor PurCem HM-20 / HM-21 / HM-22 / HM-23 covering chilled to deep-frozen. IL via Gilar.
- Master Builders Solutions (now Sika post-2023): Ucrete UD200 — deep-frozen + blast-chiller gold standard. IL via Sika's Gilar channel post-MBCC acquisition.
- Mapei: Mapefloor CPU + CPU/HD covering chilled + frozen.
- Flowcrete (Mapei sister brand): Flowfresh + Flowshield for cold-store retail-bound logistics.
- MC-Bauchemie: MC-DUR FloorTop available for chilled + frozen via A.Z Marketing (Ramle +972-8-9150190).
Common cold-store floor failures
- Cracking at door threshold. Insufficient joint width + sealant movement rating. Catch within first thermal cycle.
- Substrate condensation freezing. Missing or compromised insulation under cold room. Substrate spalling at year 2.
- Slip injuries at threshold zone. Condensation freezes; floor below R12 spec. Re-broadcast required.
- Epoxy SL chosen for cost. Thermal contraction differential cracks within 6 months. Most common cold-store failure pattern.
- Drainage not integrated to pour. Retro-cut drainage cuts through floor system; bond loss + leak path.
- Pour at substrate < +10°C. Cure curve disrupted; bond strength below spec; pull-off failure at year 1.
Final read
Cold storage is PU-cement territory. The thicker PU-cement variants (Sikafloor HM-22/23, Ucrete UD200) handle the most extreme thermal cycling that any resin floor encounters. MMA serves the retrofit niche — same-night re-open, shorter lifecycle, expects full PU-cement re-pour at next scheduled shutdown. Specify by temperature regime, hit the substrate prep discipline, plan the thermal commissioning before pour. The cold-store floor that survives 15 years is the one that was designed for thermal cycling from substrate up, not the one that "we use epoxy in our other warehouses". Related: PU-cement encyclopedia · MMA encyclopedia · Ucrete brand profile · PU-cement Big-3 comparison · selection by use case.
Sources
- Sikafloor PurCem cold-storage application guidelines.
- Master Builders Solutions Ucrete UD200 cold-storage technical literature.
- Mapei Mapefloor CPU + CPU/HD cold-storage specifications.
- Flowcrete Flowfresh + Flowshield product data sheets.
- MC-Bauchemie MC-DUR FloorTop technical data.
- EN 14904 + EN 13813 — Synthetic resin screeds standards.
- IIAR (International Institute of Ammonia Refrigeration) cold-store floor guidelines.
- Floor.DSGN IL contractor field documentation — 18+ cold-store installations.