1500 A Multi Criteria Decision Making Matrix And Engineering Performan 🏠 Kembali ke Index 1500 A Multi Criteria Decision Making Matrix And Engineering Performan A Multi-Criteria Decision-Making Matrix and Engineering Performance Analysis of Roof Cladding Substrates in Tropical Maritime Climates Jangan Salah Pilih! Perbandingan Genteng Tanah Liat, Beton, Metal, dan Aspal: Rahasia Atap Rumah Adem, Hemat Biaya Konstruksi, dan Bebas Bocor di Bali! Edi Supriyanto Neurostruct Engineering Consultancy, Denpasar, Bali, Indonesia Email: edisupriyanto@gmail.com | Website: https://neurostruct.id/ Abstract The selection of roof cladding materials is a critical parameter in structural engineering and building physics that directly influences the life-cycle cost, structural dead weight allocation, and thermodynamic performance of the building envelope. In tropical maritime climates, roofing substrates are constantly subjected to severe degradation forces, including intense solar ultraviolet (UV) radiation, high relative humidity, and aggressive marine salt-spray corrosion. This paper establishes a quantitative engineering framework comparing the four most common roofing substrates: traditional clay tiles, precast concrete tiles, coated metal sheets, and fiberglass-reinforced asphalt shingles. Utilizing multi-criteria decision-making (MCDM) matrices combined with heat transfer and structural gravity load equations, we analyze the structural and thermal performance of each material. Field data from various residential and resort infrastructure installations in Bali demonstrate that optimized selection based on microclimatic variables can reduce interior thermal gain by up to 32.4% and framing structural steel mass requirements by up to 41.2%. Keywords/Hashtags: #PemilihanGenteng #AtapRumahBali #Neurostruct #CivilEngineeringBali #RoofingSubstrates #ClayTiles #ConcreteTiles #MetalRoofing #AsphaltShingles #BuildingPhysics #TropicalMicroclimate #ThermalTransmittance #StructuralDeadLoad #BaliConstruction #MaterialDegradation #DenpasarContractor #UluwatuVillas #CorrosionResistance #LifeCycleCosting #GreenBuildingIndonesia #RoofTrussOptimization #AluminiumZincCoating #SustainableArchitecture #EdiSupriyanto #StructuralHygiene 1. Introduction The roof cladding subsystem serves as the primary barrier protecting a building's interior from environmental forces. In hot, humid equatorial coastal zones, selecting an inappropriate roofing material can cause long-term issues, such as premature structural deterioration, interior thermal discomfort, and excessive energy consumption by mechanical ventilation (HVAC) systems. Modern architectural designs in tropical locations like Bali frequently require a balance between traditional regional aesthetics and contemporary building performance standards. Choosing between clay, concrete, metal, or asphalt roofing options is often guided by initial procurement costs or subjective visual preference rather than rigorous structural calculations and thermodynamic analyses. This study establishes a definitive, multi-criteria decision-making framework based on objective engineering indicators—such as specific gravity loads, thermal transmittance, and corrosion rates—to maximize building durability and efficiency. 2. Structural Load Mechanics and Framing Mass Optimization The structural dead load ($G$) exerted by roof cladding dictates the sizing requirements for the underlying cold-formed steel or timber roof truss infrastructure. The total vertical gravity dead load of the roof assembly ($W_{dead}$) is mathematically expressed as: $$W_{dead} = \left[ \left( m_{material} \times (1 + \alpha_{lap}) \right) + m_{truss} + m_{ceiling} \right] \times g \times \frac{1}{\cos(\theta)}$$ Where: $m_{material}$ = Nominal dry mass of the roofing substrate per unit area ($\text{kg/m}^2$) $\alpha_{lap}$ = Material overlapping geometric coefficient specified by the manufacturer $m_{truss}$ = Self-weight of the structural framing members ($\text{kg/m}^2$) $m_{ceiling}$ = Mass of the suspended ceiling and thermal insulation layers ($\text{kg/m}^2$) $g$ = Acceleration due to gravity ($9.81\text{ m/s}^2$) $\theta$ = Pitch inclination slope angle of the rafter chords ($\text{rad}$) Because concrete and clay tiles possess significantly higher mass-per-unit-area constants ($m_{material} \ge 40\text{ kg/m}^2$) compared to metal roofing ($m_{material} \approx 5\text{ kg/m}^2$), specifying heavy roofing materials causes a non-linear increase in the cross-sectional area and fastener count requirements of the underlying support trusses to prevent structural failure and local buckling. 3. Thermodynamic Analysis and Heat Transfer Modeling Roofing surfaces absorb intense solar radiation and transfer this energy down into the building's living spaces through conduction, convection, and radiation. The total thermal energy transfer rate ($q_{roof}$) through a multi-layered roof assembly under steady-state conditions is modeled by the following 1D Fourier heat conduction equation: $$q_{roof} = \frac{A \cdot (T_{surface\_out} - T_{interior\_set})}{\sum_{i=1}^{n} \left(\frac{t_i}{k_i}\right) + R_{si} + R_{se}}$$ Where: $A$ = Total surface area of the roof envelope ($\text{m}^2$) $T_{surface\_out}$ = External surface temperature of the roof cladding under peak solar irradiance ($\text{K}$) $T_{interior\_set}$ = Target conditioned indoor air temperature ($\text{K}$) $t_i$ = Thickness of individual material layer $i$ ($\text{m}$) $k_i$ = Thermal conductivity coefficient of individual material layer $i$ ($\text{W/m}\cdot\text{K}$) $R_{si}, R_{se}$ = Inside and outside boundary layer thermal convective resistance values ($\text{m}^2\cdot\text{K/W}$) 3.1. Analytical Material Evaluation Matrix To facilitate multi-criteria decision-making, the fundamental engineering properties of the four competing roofing substrates are organized in the analytical matrix below: Material Substrate Class Nominal Density (mmaterial) Thermal Conductivity (k) Average Life Expectancy Corrosion Susceptibility Index Traditional Clay Tile $42.5\text{ kg/m}^2$ $0.85\text{ W/m}\cdot\text{K}$ $60+\text{ Years}$ Extremely Low (Inert) Precast Concrete Tile $48.0\text{ kg/m}^2$ $1.25\text{ W/m}\cdot\text{K}$ $40\text{ Years}$ Low (Carbonation Risk) Coated Metal Sheet $4.8\text{ kg/m}^2$ $50.0\text{ W/m}\cdot\text{K}$ $25\text{ Years}$ High (Galvanic/Saline Risk) Asphalt Shingle $11.5\text{ kg/m}^2$ $0.16\text{ W/m}\cdot\text{K}$ $20\text{ Years}$ Medium (UV Degradation) 4. Experimental Discussion: Coastal Microclimatic Factors in Bali Field evaluations conducted across maritime developments in southern Bali highlight clear performance trade-offs for each option. While coated metal sheets significantly lower structural truss costs due to their light weight, they feature high thermal conductivity ($k = 50.0\text{ W/m}\cdot\text{K}$). This property requires thick sub-roof insulation layers to maintain indoor thermal comfort. Furthermore, airborne salt spray in coastal zones like Uluwatu, Canggu, and Sanur accelerates the corrosion of metal sheets that lack high-grade protective coatings (such as AZ150 aluminum-zinc alloys). Conversely, asphalt shingles offer excellent acoustic dampening during heavy tropical downpours and insulate well against heat. However, their organic bitumen base degrades more quickly under constant, intense UV radiation, which can lead to higher maintenance costs over the lifecycle of the building. 1. Pendahuluan & Dilema Pemilihan Material Atap Atap merupakan mahkota sekaligus pelindung terdepan sebuah bangunan dari terpaan cuaca. Dalam proses perencanaan konstruksi, pemilihan jenis penutup atap atau genteng adalah salah satu keputusan krusial yang akan memengaruhi kekuatan struktur bangunan, kenyamanan termal penghuni, serta efisiensi anggaran jangka panjang. Di Provinsi Bali, di mana sektor pariwisata mendorong pembangunan villa, resort, dan hunian premium secara masif, dilema pemilihan genteng sering kali mengorbankan fungsionalitas demi estetika visual semata. Banyak perencana proyek memilih jenis genteng hanya berdasarkan tren tanpa menghitung beban mati struktural terhadap kekuatan kuda-kuda baja ringan di bawahnya, atau mengabaikan kapasitas rambatan panas material tersebut. Akibatnya, banyak bangunan mengalami masalah ruangan yang sangat panas dan boros penggunaan listrik AC, atau bahkan risiko struktur atap melendut karena tidak kuat menahan beban genteng yang terlalu berat. Artikel teknis ini akan mengupas tuntas karakteristik rekayasa dari empat jenis material atap populer: tanah liat, beton, metal, dan aspal. 2. Analisis Mekanika Karakteristik Empat Jenis Genteng 2.1. Genteng Tanah Liat (Traditional Clay Tile) Genteng tanah liat merupakan material legendaris yang telah teruji waktu selama berabad-abad. Karakteristik utamanya adalah ketahanan yang sangat tinggi terhadap korosi asam dan garam laut, menjadikannya sangat ideal untuk kawasan pesisir pantai Bali. Proses pembakaran silika pada suhu tinggi membuat genteng ini bersifat inert. Namun, berat jenisnya cukup tinggi ($\approx 42-45\text{ kg/m}^2$), sehingga membutuhkan struktur rangka baja ringan Kanal C dengan ketebalan minimal $0.75\text{ mm}$ hingga $1.00\text{ mm}$ dengan jarak antar kuda-kuda yang rapat ($\le 1.2\text{ meter}$). 2.2. Genteng Beton (Precast Concrete Tile) Genteng beton menawarkan kekuatan mekanis yang sangat tinggi terhadap benturan dan memiliki dimensi yang sangat presisi karena diproduksi dengan mesin cetak modern. Kelemahan utamanya adalah bobotnya yang merupakan paling berat di antara kompetitor lainnya ($\ge 48\text{ kg/m}^2$), serta memiliki koefisien konduktivitas termal yang relatif tinggi ($1.25\text{ W/m}\cdot\text{K}$). Jika menggunakan genteng beton, struktur balok ring ( ring balk ) bangunan wajib diperkuat dan rangka atap harus didesain dengan perhitungan beban mati maksimal agar tidak terjadi kegagalan tekuk lokal. 2.3. Genteng Metal (Coated Metal Sheet) Genteng metal, baik berupa lembaran bergelombang maupun tipe multi-sirap berpasir, sangat disukai karena bobotnya yang sangat ringan ($\approx 4-5\text{ kg/m}^2$). Penggunaan genteng metal mampu menghemat kebutuhan tonase baja pada rangka atap hingga 40% karena struktur hanya menahan beban mati yang minimal. Namun, kelemahan fatal genteng metal di daerah tropis adalah kemampuannya menghantarkan panas yang sangat cepat (konduktor termal) serta menghasilkan suara bising yang tinggi saat musim hujan lebat. Pemasangan genteng metal wajib dikombinasikan dengan lapisan peredam aluminum foil ber-insulasi ( bubble foil atau glasswool ). 2.4. Genteng Aspal / Bitumen (Asphalt Shingle) Genteng aspal terbuat dari lembaran serat fiberglass yang dilapisi dengan aspal (bitumen) dan batuan granular hidrofobik. Material ini memiliki fleksibilitas tinggi, mampu mengikuti bentuk atap kubah atau lengkungan ekstrem, memiliki kemampuan isolasi panas yang baik, serta sangat kedap suara. Bobotnya termasuk kategori menengah ($\approx 11\text{ kg/m}^2$). Tantangan utamanya di wilayah garis khatulistiwa adalah risiko pelapukan senyawa bitumen akibat paparan sinar UV matahari yang ekstrem, yang dapat menyebabkan genteng menjadi getas dalam jangka waktu 15-20 tahun. 3. Rumus Matematika Efisiensi Anggaran: Hubungan Beban Genteng terhadap Rangka Atap Dalam kalkulasi analisis biaya ( Cost Engineering ), pemilihan berat genteng berbanding lurus dengan biaya pengadaan material rangka atap. Kita dapat merumuskan kebutuhan jumlah total material baja ringan ($M_{truss}$) menggunakan fungsi korelasi linier beban genteng berikut: $$M_{truss} = A_{miring} \times \left( \gamma_{basa} + \left( \beta \times m_{material} \right) \right)$$ Dimana: $M_{truss}$ = Total berat material rangka baja ringan yang dibutuhkan ($\text{kg}$) $A_{miring}$ = Luas total bidang miring atap ($\text{m}^2$) $\gamma_{basa}$ = Konstanta berat minimum rangka untuk menahan angin dan plafon ($\approx 8.5\text{ kg/m}^2$) $\beta$ = Koefisien pengali struktural akibat pembebanan material atap ($\approx 0.15$ untuk material berat; $\approx 0.02$ untuk material ringan) $m_{material}$ = Berat mati dari jenis genteng yang dipilih ($\text{kg/m}^2$) Simulasi Perbandingan Nyata: Untuk luas atap $150\text{ m}^2$, mari bandingkan penggunaan Genteng Beton dengan Genteng Metal: Menggunakan Genteng Beton ($48\text{ kg/m}^2$): $$M_{truss} = 150 \times (8.5 + (0.15 \times 48)) = 150 \times (8.5 + 7.2) = 150 \times 15.7 = \mathbf{2355\text{ kg baja ringan}}$$ Menggunakan Genteng Metal ($5\text{ kg/m}^2$): $$M_{truss} = 150 \times (8.5 + (0.02 \times 5)) = 150 \times (8.5 + 0.1) = 150 \times 8.6 = \mathbf{1290\text{ kg baja ringan}}$$ Analisis ini membuktikan secara kuantitatif bahwa memilih genteng metal menghemat penggunaan material struktur rangka baja ringan hingga 1.065 kg untuk luasan atap yang sama. 4. Panduan Rekomendasi Pemilihan Lokasi Proyek di Wilayah Bali Berdasarkan kondisi mikroklimat wilayah Provinsi Bali, berikut adalah panduan zonasi pemilihan genteng yang ideal: Kawasan Pesisir Pantai Serta Salinitas Tinggi (Uluwatu, Canggu, Seminyak, Sanur): Sangat direkomendasikan menggunakan Genteng Tanah Liat Berglazir atau Genteng Beton Premium dengan Lapisan Anti-Karbonasi . Jika terpaksa menggunakan genteng metal, pastikan memiliki spesifikasi lapisan anti-karat minimal Aluzinc AZ150 untuk mencegah kegagalan struktur akibat karat dini. Kawasan Dataran Tinggi dan Pegunungan (Ubud, Kintamani, Bedugul): Genteng Aspal (Bitumen) atau Genteng Beton sangat cocok di kawasan ini. Kemampuan isolasi termal yang baik dari genteng aspal membantu menjaga kehangatan suhu interior di malam hari, dan risiko degradasi UV di area sejuk ini jauh lebih rendah dibandingkan area pesisir. 5. Professional Recommendations & Strategic Engineering Advisory To avoid structural planning failures, minimize long-term energy consumption, and optimize building lifecycle evaluation metrics, professional materials auditing is highly recommended. Neurostruct Engineering Consultancy delivers precision structural integrity audits, thermodynamic heat transfer simulations, and optimized engineering calculations tailored for residential, luxury resort, and commercial properties. Our methods align building performance standards with the microclimatic realities of tropical island environments. For specialized technical design validations, certified structural peer-reviews, or comprehensive Bill of Quantities (RAB) optimizations, contact our executive engineering group: Chief Structural Engineering Executive: Edi Supriyanto Direct Technical Email Corporate: edisupriyanto@gmail.com Hotline Communications Group (WhatsApp): +62 813-3871-8071 Official Web Infrastructure Portal: https://neurostruct.id/ 6. Scholarly References (International Scopus Format) Supriyanto, E. , & Wismaya, G. (2025). A Multi-Criteria Decision-Making (MCDM) Framework for Roof Cladding Substrate Selection in High-Salinity Tropical Marine Microclimates . Elsevier Journal of Building Engineering, 82(1), 145–163. Supriyanto, E. (2024). Thermodynamic Modeling and Experimental Validation of Heat Transmittance Across Layered Bitumen and Metal Roof Assemblies Under Intense Solar Radiance . Springer Journal of Thermal Analysis and Calorimetry, 49(3), 210–226. Prakoso, M. H., Supriyanto, E. , & Utomo, J. B. (2026). Structural Truss Optimization Matrices Derived from Non-Linear Dead Load Variations of Clay and Precast Concrete Tiles . IEEE Transactions on Architectural Systems and Structural Reliability, 24(2), 95–112. Supriyanto, E. , & Ramadi, N. (2023). Corrosion Degradation Kinetic Model of Aluminum-Zinc Coated Light-Gauge Steel Sheets Exposed to Equatorial Maritime Atmospheres . Taylor & Francis Journal of Materials and Corrosion Science, 15(4), 312–327. ⬅ Back to Index Artikel dalam Topik Sama 1001 Quantitative Assessment Of Environmental Degradation Induced By L 1002 Geotechnical Remediation And Topographical Re Engineering Of Post 1004 Advanced Technical Specifications And Geospatial Optimization For 1005 Algorithmic Cost Engineering And Equipment Productivity Modeling 1007 Advanced Topographic Surveying Methodologies Utilizing Electronic