JAUE2022-090: Multi-layer Walls Environmental Assessment for Affordable Apartment Design

Abstract

The U-value or thermal transmittance measure the heat transmittance of a building component and being used to quantify the heat gain or heat loss through the building envelope. Green building regulation is specifying reduced U-values for building components in an effort to reduce energy consumption for thermal comfort of the building occupant. Existing affordable apartment (Rusunawa) wall are using one layer material covered by mortar cement finishing and paint. For improving the thermal performance, the future Rusunawa design need an improved multilayer wall with a lower U-value. The addition of wall layers must consider environmental aspect such as embodied energy and carbon. This paper aims to estimate and compare the theoretical U-values, embodied energy, and embodied carbon of the alternative multi-layer walls. Six alternatives multi-layer walls constructions are investigated. The wall materials investigated were fiber cement board, aerated concrete block, and cross laminated timber combined with insulation materials of expanded polystyrene and rockwool. The results showed that the proposed wall configurations for affordable apartment in Indonesia have potential environment impact reduction compared to typical wall