12, 15 & 20 year ballasted roof system:
- Ballast surface protection.
- S-Felt T 300 or Sika-Trocal® SBV upper protection layer.
- Sika-Trocal® SGmA waterproof covering.
- Polyisocyanurate foam board insulation.
12, 15 & 20 year ballasted roof system:
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