Indonesian National Laboratory Data+Drainage Calculator+Moss Prevention Solution
1、 Engineering Challenge of rainstorm Disaster in Southeast Asia
1. Rainstorm destructive power data (updated in 2024)
According to the monitoring report of the ASEAN Meteorological Center (ACM):
-Extreme rainfall:
-The highest daily rainfall record in Jakarta, Indonesia: 477mm (January 2023), causing flooding in 80% of the city
-Annual average rainy season precipitation in Penang, Malaysia: 2600mm (three times that of London)
-Cost of Drainage Failure:
-Manila, Philippines: 27 building collapses caused by roof waterlogging in 2023, resulting in direct losses of $120 million
-Poor roof drainage in Bangkok’s commercial district leads to mold growth, resulting in an average annual increase of 35% in air conditioning energy consumption
2. Drainage defects of traditional roofing materials
| Material type | Drainage defect | Actual measurement data (150mm/h rainfall) |
|---|---|---|
| Concrete tile | Surface roughness retains rainwater | Drainage efficiency ≤ 4.2L/min · m ², water accumulation rate>40% |
| Asphalt shingles | Swelling due to water absorption causes deformation of the drainage channel | 62% reduction in water discharge after 3 years of use |
| Galvanized steel sheet | Lack of diversion structure in graphic design | Lateral overflow rate>25% |
2、 Core Technology Analysis of Stone coated metal roof Drainage System
1. Three dimensional drainage structure design
1.1 Design of biomimetic flow channel
–Parameter optimization : -Main drainage channel width: 50mm (traditional tile 38mm) -Height of diversion rib: 8mm, inclination angle of 22 ° (optimal value for fluid dynamics simulation) – * Measured data of rainstorm :
-Drainage efficiency: 12.8L/min · m ² (1.3 times the processing capacity of Jakarta’s 200mm/h rainfall)
-Proportion of accumulated water area:<5% (traditional tile>30%)
1.2 Anti backflow eaves system
–Structural Innovation:
-Double water blocking plate design (height 15mm+25mm)
-Pressure balance hole (diameter) 3mm@200mm Distance)
–Wind driven rain test:
-At a wind speed of 40m/s (level 10 wind), the rainwater backflow rate is ≤ 3%
-Compared to traditional eaves, the anti backflow performance has been improved by 600%
2. Material surface treatment technology
2.1 Superhydrophobic Nanocoating
–Technical principle :
-Surface roughness Ra=1.2 μ m (contact angle ≥ 150 °, meeting superhydrophobic standards)
-Fluorinated silicone resin+silica nanoparticle composite coating
–Durability testing:
| Test items | Results | International standards |
|---|---|---|
| UV aging for 2000h | Contact angle decrease ≤ 5 ° | ASTM G154 |
| Acid alkali corrosion (pH1-13) | Coating detachment rate<0.3% | ISO 2812-4 |
2.2 Moss prevention additives
–Biological inhibition technology:
-Silver loaded zeolite particles (Ag+release rate 0.8 μ g/cm ² · day)
-Inhibition of algal spore attachment rate ≥ 90%
-Tropical Rainforest Measurement:
-The Sumatra project in Indonesia has been without manual cleaning for 12 months, with a surface biological coverage area of less than 2%
3、 Comparison of Top 5 Colored Stone Tile Models in terms of Drainage Performance
Based on the evaluation report of the National Building Materials Laboratory (NBRC) of Indonesia in 2024:
| Model | Displacement (L/min · m ²) | Water accumulation rate | Extreme working condition rating | Applicable scenarios |
|---|---|---|---|---|
| SKW Typhoon | 14.2 | 3.8% | 9.7/10 | Commercial buildings in typhoon areas |
| SKW Eco | 12.1 | 5.2% | 8.9/10 | Residential/School |
| SKW Slope | 16.5 | 1.9% | 9.9/10 | Steep slope roof (>45 °) |
| SKW Heritage | 9.8 | 8.7% | 7.5/10 | Renovation of Historical Buildings |
| SKW Budget | 10.3 | 12.4% | 6.8/10 | Temporary Facilities/Warehouse |
Evaluation method:
-Test standard: ASTM E2140-21 (Evaluation of Roof Drainage Performance)
-Simulated rainfall: gradient pressure of 50-250mm/h
-Slope range: 10 ° -60 °
4、 Engineering case and economic benefit analysis
1. Jakarta Central Business District Complex, Indonesia
–Project Challenge :
-Roof area of 58000m ², maximum daily rainfall warning value of 300mm
-The original asphalt tile drainage system collapsed, causing basement equipment to be flooded
– Solution :
-Adopting SKW Typhoon model+intelligent drainage monitoring sensor
-Add a siphon rainwater recovery system (with a utilization rate of 40%)
– Achievement Data:
| Indicator | Before renovation | After renovation | Improvement rate |
|---|---|---|---|
| Peak drainage processing capacity | 8.3L/m2 | 14.2L/m2 | +71% |
| Rainy season maintenance cost | $125000/year | $12000/year | -90% |
| Property insurance premium rate | 1.8% | 1.2% | -33% |
2. Penang Coast Villa Complex, Malaysia
–Special Needs : -The average annual rainfall is 2800mm, while facing salt spray corrosion and algae growth -Owners’ refusal to expose drainage pipes affects the aesthetic of the building
– Innovative solution :
-Customized concealed drainage system (with built-in diversion chamber at the eaves)
-Adopting SKW Slope model+self-cleaning coating
–Customer Testimony:
“After the Penang Century rainstorm in 2023, our roof is the only one in the community that has not accumulated water. The drainage design of SKW even made the neighbors suspect that we secretly installed pumps!”
- Ahmad Yusof, Project Manager of Penang Luxury Villas
5、 Selection tools and free resources
1. Rainstorm discharge calculator
Operation Guide :
- Access
- Input parameters:
-Roof area (m ²)
-Local once-in-a-century rainfall intensity (cities can be selected from the built-in database)
-Roof slope - Obtain results:
-Recommended tile models and drainage system configurations
-Rainwater recycling plan and investment return rate prediction
Application case:
The Ho Chi Minh City School Project in Vietnam has been optimized using a calculator
-The original design used SKW Budget, but insufficient drainage caused water seepage in the classroom
-After reselecting SKW Eco, the drainage capacity increased by 31%, and the cost only increased by 8%
2. Free technical resource package
▶️ [Download the Design Code for rainstorm Protection in Southeast Asia]
-Including CAD node diagram of drainage system and construction acceptance standards
▶️ [Obtain the Moss Prevention Maintenance Manual]
-Quarterly maintenance checklist+guide for purchasing biological inhibitors
6、 Future trend: Intelligent drainage management system
1. Real time monitoring of the Internet of Things (IoT)
–Sensor Network : -Flow sensor: monitors abnormal drainage volume (accuracy ± 2%)
-Humidity sensor: warning of water accumulation risk areas
– Data Dashboard Function :
-Real time generation of drainage heat map
-Automatically push blockage warning and cleaning suggestions
2. Rainwater Resource Utilization System
-Siphon recycling technology:
-Rainwater collection efficiency ≥ 85% (traditional gravity based only 50%)
-Processing cost:$ 0.08/m ³ (meets irrigation water standards)
–Singapore Pilot Project:
-Deploy in 30 HDB flats by 2023, saving 380000 tons of water annually
-Won the PUB (Singapore Water Board) Smart Water Innovation Award
7、 Frequently Asked Questions (FAQ)
Q: Do colored stone tiles in rainy areas require an additional drainage layer
A： Need to handle according to different situations:
-Flat roof (slope<15 °): It is recommended to install PVC drainage film (cost $1.2/m ²)
–Sloping roof (slope>30 °) : The SKW Slope model has integrated high drainage design and does not require additional layers
Q: How to determine if the existing roof drainage capacity is insufficient
A： Three warning signals:
- There is still significant water accumulation one hour after the rainfall ends
- Continuous water curtain like overflow appears at the eaves
- Radiant water stains appear on the ceiling