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Mineral Wool Compression Calculator
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UL/ULC & Manufacturer-Approved – ASTM E1399 / E2307 / UL 2079 Compliant
1. Nominal Joint Width
(at installation temperature)
inches
millimeters
2. Mineral Compression Percentage
(most common = 33% for ±25% movement)
20%
25%
30%
33% ← most common
35%
40%
45%
50%
3. Mineral Wool Density
4 lb/ft³ (64 kg/m³) – Standard
6 lb/ft³ (96 kg/m³)
8 lb/ft³ (128 kg/m³)
CALCULATE UNCOMPRESSED WIDTH
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