Tropical Roofing

Ondulit Italiana

TROPICAL ROOFING

SUSTAINABLE BUILDING IN TROPICAL CLIMATES

Good architecture must create the right balance between man, construction and the environment.

The comfort of people living or working in a building must be the focus of the design.

There must also be respect for the surrounding environment and sustainability over time.

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Tropical areas, with the combination of hot and humid climates with strong solar radiation, create a number of challenges to which design best practices and the evolution of the architectural systems are providing answers. In this perspective, bio-climatic architecture has and is having a significant role in creating a better balance between man and nature.

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HARNESSING SOLAR ENERGY FOR MAXIMUM COMFORT

Thermal control is a key aspect in finding the right level of comfort for the inhabitants of a building.

(heat gain prevention) as it does on dispelling heat from the building with low or no energy consumption.

Contrary to architecture in cold and temperate areas, architecture in hot climates has to focus on heat gain control.

Protecting interiors from direct solar exposure and the use of cladding materials with heat reflective properties are the best strategies for preventing overheating through the building envelope.

This approach works at the same time by preventing heat from entering the building

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The use of on-site energy - available from the environment - to manage heat is the way to achieve indoor thermal comfort via energy saving and environmentally sustainable means.

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PROTECTING THE BUILDING AND REFLECTING SOLAR ENERGY

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Roofing and siding could be larger contributors to the interior heat load, therefore high solar reflectance is the most important characteristic of materials that constitute the building shell.

Solar reflectance is the ability of a surface to reflect incident solar energy, reducing the amount of heat absorbed and then radiated to the interior.

In this approach, the adoption of traditional insulation as a barrier to thermal transmission between indoor and outdoor is less important than the shading and heat reflecting functions.

That is because in cold climates the preservation of indoor heat is a wellness factor. The same result, in hot climates, emerges on the contrary as a discomforting element.

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PROTECTING THE BUILDING

Detail design In tropical climates, shading doors and windows is essential to minimize direct solar radiation of the interiors, preventing overheating.

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DISSIPATING THE HEAT THROUGH NATURAL VENTILATION

The second basic concept consists of helping the dissipation of internal heat by driving warm air out.

Stack ventilation is a design strategy that relies on the natural airflow generated by temperature and pressure differences.

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Warm inside air rises and exits through openings located at ceiling height while cooler outside air replaces it through specific inlets located near the floor.

Wind driven flows through the building - cross ventilation - and the canalization of airflows can contribute to increase the dissipation of internal overheating.

It is also important to contain the internal heat gains generated inside the building due to equipment (lighting, electric appliances) and occupancy.

Taking advantage of these techniques, results in significant overall energy savings, starting from those related to air conditioning.

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VEGETATION AS ELEMENT OF PROTECTION AND WELLNESS

Trees and vegetation offer seasonal shading to a building, cooling through transpiration, remove air pollutants, store carbon, reduce noise levels and protect from strong winds.

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SOUND PROOFING

Heavy tropical rains can cause serious noise problems, due to their impact on the roof surface, for those who live and work in the surroundings of the building.

Again, as with building overheating, the adoption of technologies that limit outside influences ensure comfort inside the building.

In particular, a metal roof tends to amplify both ambient and contact noise.

The impact of precipitation causes the vibration of metal, which creates the noise.

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SUSTAINABILITY IN SEVERE CLIMATES

The persistent humidity of these climates, strong solar radiation and frequent closeness to the sea create particularly severe conditions for building envelopes, which can significantly reduce their durability or create need for frequent maintenance.

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It is therefore recommended to use materials that specifically provide protection for this type of exposure.

In case of metal cladding, the corrosive humid atmosphere with different concentration of sodium chloride, and the thermal expansion induced by solar heat gains, are factors to be considered in the design.

Strong winds are also common in these areas, requiring materials with adequate mechanical resistance and reliable fastening systems.

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INSULATING MULTILAYER PROTECTED STEEL ROOF PANELS

HOW WE BUILD EXCELLENCE

PLASTIC COMPOUND

ALUMINIUM FOIL

Ondulit

CERTIFICATIONS

PLASTIC COMPOUND

ALUMINIUM FOIL

GALVANIZED STEEL

Coverib 850

Coverib 1000

CoverTile

Product international technical approvals CE marking per EuroNorm EN 14782 French C.S.T.B. Cert. No. 5/04 - 1798 Italian I.T.C. Cert. No. 645/07 Miami Dade County Building Code (NOA NO. 13-1010.10 - profile Coverib 1000) China MAC Cert. No. 201500856E 201500856E

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PROVEN DURABILITY

Our original steel multilayer protection technology is based on the “duplex” effect in which durability is increased by the reciprocal protection provided by each different layer. Moreover, a 1700 microns thick protective coating - compared to standard 25 microns - grants greater anti-corrosive effectiveness.

EXCELLENT THERMAL COMFORT

The reflective power of natural aluminium top finishing (about 90% of thermal radiations) and the thermal inertia of the thick protective layers highly limit overheating of cladding under sun radiation. Bottom aluminium finishing emits to the interior just about 5% of this very limited heat. In tropical climates the adoption of additional insulation is therefor often unnecessary.

EXCELLENT ACOUSTIC COMFORT

Our roofing systems are unique in having a thick anti-noise layer on the top side of the sheet. This plastic coating absorbs rain impact and avoids metal vibration, the cause of the roaring noise. Ondulit roofings are aphonic.

Moreover, Ondulit-Coverib sheets feature an average damping of 28 dB.

LOAD RESISTANCE

The steel core of our multilayer system offers high tensile strength values, grants robustness and allows larger spanning of the supporting structure.

LABORATORY TESTS

DURABILITY Salt Spray Resistance - ISO 9227 and ASTM B117: 3000 hours SO2 Sulphure Dioxide Resistance - ISO 6988: 45 cycles Humidity Resistance - ISO 6270-1 and ASTM D2247: 3000 hours Accelerated Weathering Resistance - ASTM G155: 2000 hours ACOUSTIC COMFORT Deadening - ISTEDIL Certificate 1302-3: Up to 8,41 times higher than a 70 mm thick Aluminium Sheet and up to 4,17 times higher than a Sandwich Panel with 40 mm insulation.

Sound Insulation - ISO 140-3: 28 dB at 500 Hz THERMAL COMFORT Admissible Thermal Interval: -30 / +80°C Reflective Power (Reflectance): ASTM E903: about 90%* Radiating Power (Emittance):ASTM C1371: about 5%*

LOAD RESISTANCE Impact Strength: Florida Building Code TAS201: No penetration or failure to Large Missile Impact ITC-CNR NORM - Dynamic Stress: Steel Sphere 0,5 kg, Diam. 50 mm, height of fall 2,5 m, Impact Energy daN/m 1,25: No penetration or failure Tensile Test: ASTM E8-11: Yield Stress 58312 psi FIRE PERFORMANCE Reaction to Internal Fire EN 13501-1:2007+A1; EN 13823; EN ISO 11925-2: Class B, s1- d0 ASTM E84: Class B Reaction to External Fire EN 13501-5: Class BRoof T3 ASTM E108: Class B

*Natural Colour

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The suggestion and data reported in this documentation are based on information we believe to be reliable, being the result of long experience and considerable knowledge as well as of field and lab test.They are offered in good faith, but with no guarantee, as conditions and methods of use of our products are beyond our control. They do not involve any responsibility whatsoever for Ondulit Italiana S.p.A. Ondulit Italiana S.p.A. is fully entitled to modify or improve its products at any time without notice.

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INSULATING MULTILAYER PROTECTED STEEL ROOF PANELS