Estidama Pearl block selection — quick reference for Abu Dhabi projects
Which Tiger Stone SKU to short-list for Estidama Pearl 1 vs Pearl 2 walls, and how the U-value calculation works so you can verify the numbers for your energy report.
TL;DR — A 250 mm Tiger Stone insulated block plastered both sides can support Estidama Pearl 1 thermal-envelope compliance for many wall types, and stays useful for retrofits. For the tighter Pearl 2 target, adding an external insulation board over the same masonry improves the assembly further.
How the calculation works (ISO 6946 simple method): the assembly U-value is built from internal + external surface resistances plus each layer (block + plaster). The insulated block, with its EPS core, contributes the bulk of the thermal resistance. We do not quote a single headline U-value here because it depends on your full wall build-up and the tier you are targeting — share the layers and the target Pearl tier and we will work the numbers with you for the energy report.
Where the choice flips — atrium walls and high-glazing facades: thermal bridges around openings dominate the calculation. In those rooms, specify the 250 mm insulated block AND an external insulation board to push the assembly toward the Pearl 2 target.
Practical short-list for Abu Dhabi residential: 250 mm insulated block (TS-I-10) for external walls; 200 mm insulated (TS-I-8) where wall thickness is constrained; 200 mm hollow (TS-H-8) for internal partitions where U-value is irrelevant.