Micro Concrete Roofing Tiles
Micro Concrete Roofing (MCR) tiles are made of a mixture of cement, sand, and water as an alternative roofing material.
Micro Concrete Roofing (MCR) tiles are made of concrete (mixture of cement, sand and cement) as an alternative to traditional roofing materials such as thatch, iron sheeting, or asbestos.
Goal 11: Sustainable cities and communities
Any person looking for a roofing alternative. NGOs or any individual could start a production facility.
Tiles can be produced on the construction site, or made-to-order or mass-produced at a production facility and then transported to the site.
Open source. There are patents on similar products but the technology is part of the public domain.
User can manufacture the tiles with the correct equipment, get them through a contractor, or directly from a manufacturer.
Size of the component
List of primary materials in the component
List of secondary materials in the component
Measurement, calculated in hours, of the component’s resistance to fire
R value associated with material/product
The compressive strength of the component, measured in megapascals
List of suitable climates for use of this components
To manufacture a micro concrete tile, it is necessary to have molds, a tile vibrator, plastic sheets, batching boxes, a tank for curing in water, and a table. The materials needed are sand, cement and water. Pigments are optional to produce colored tiles.
The dry materials are mixed first in the correct proportions. The water is added gradually, continually mixing, until it is workable.
Then the vibrator is placed on the table. A plastic sheet must be placed on top. The mix is then put on the plastic sheet, working it while the vibrator is on for 30 seconds. The tile nib is then attached to the tile. Take the whole tile, with the plastic sheet, and place it on the mold. Leave overnight.
The next day, the tiles would be removed from the molds and left inside a water tank to cure for at least 5 days. Then remove and leave to cure with air for 20 days. During this curing time they should be sprayed with water twice a day.
This process can also be viewed on online videos.
MCR tiles can vary in size, shape and color. There are different molds to create shapes such as ridges or corrugated shapes. If pigments are added to the mix, different colors can be achieved. Red is the most common color. MCR tiles are much lighter than standard concrete roofs and reduce noise when rain falls on them.
The roof structure is a group of purlins and rafters made of either timber or metal, and use triangular trusses if necessary. The spacing of these elements depends on the slope, climate, and tile weight. The pitch of the roof is at least 22°, and 30° in places where it rains heavily. To attach the tiles, it is necessary to place battens (made of wood or steel) with no more than 40 cm of spacing. These should be able to hold the tiles’ weight and the weight of a worker.
Installation of MCR tiles
Aligning MCR tiles
Boral in Australia offers guidelines for construction with their MCR product.
A general contractor could be able to provide assistance. The roof structure must be designed according to user’s needs. The MCR tiles are just placed on the structure and attached with a nail or a wire, so any worker can learn to install them.
A broken tile can be replaced with a new one of the same type
The MCR tiles should be lightweight, aesthetically pleasing, cost-effective, and durable. They offer security and comfort for the user, protecting from sun, heavy rain, and frost.
A study conducted to test the strength and durability of MCR tiles found that they had comparable performance to conventional roofing materials.
During installation, the user is exposed to the expected construction risks, such as heights and sharp tools
Jayasinghe, C., JDe. Silva, M., Dissanayake, D., Fernando, C., 2006., Engineering Properties of Micro Concrete Roofing Tiles,
Several methods are used to to test the quality of a MCR tile including ring, impact, load, water column, and water absorption tests.
No specialized infrastructure is needed to start a production facility. It is required to have access to the raw materials (sand, cement), water, storage room, electricity and a shed or roofed area to avoid harsh weather. The raw materials can usually be delivered by truck. Electricity is essential to have the vibration tables running. The storage room would be used to keep raw materials and finished tiles.
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