The choice of the bricks used in the walls has been difficult. So we've searched bricks with a high capacity termoacumulación (on the inside of the wall), low coefficient of heat transfer (on the outer face of the wall). This balanced with a s affordable costs.
Our choice:
to the inside of the wall mult icap we chose solid-pack bricks . These bricks have a high capacity termoacumulación (2.5 MJ / Km 3 , the higher more accumulation). Also have a high mechanical strength and a moderate price. The downside is the environmental impact of their fa turing (being cooked in ovens), the high cost of labor for installation and that difficult to install wiring and pipes (we're putting l facilities to air chamber).
On the outside will termoarcilla of 14 cm. Termoarcilla block is a lightweight ceramic block, with air cells between sheets of ceramic material to prevent its convective motion. These blocks has good insulating capacity (Thermal conductivity: 0.3W/mK, the higher the less insulation) as well as its cost is quite low and requires very little mortar. However, the environmental impact d and its manufacture is high and has very low capacity termoacumulación ( 0.7 MJ / km 3), so that it is inappropriate to use in monolayer walls.
The interior walls are perforated bricks 10. These present a good balance between the capacity of term oacumulación ( 1.6 MJ / km 3) , the ability to embed the wiring and pipelines and their cost.
Other alternatives: double hollow brick, the bricks are commonly used in construction, despite its low capacity insulation (thermal conductivity: 0.5W/mK) and moderate capacity of termoaculuación ( 1.1 MJ / km 3) . addition, being built in ovens, their development involves a high environmental impact. The only upside is its low cost.
Climablock : It consists of a cluster of wood chips and cement, with a insulation board is inside. The best of this block is its good thermal behavior (thermal conductivity: 0.15W/mK, termoacumulación: 1.7MJ / Km 3 ) can also be used as structural walls, making them suitable for monolayer walls. However, it is very high environmental impact of its manufacture by the use of cement, expanded polystyrene insulation and concrete filling.
Cannabrick : A block of lime mortar lightened and reinforced with hemp fibers. The strength of cannabrik low environmental impact of its manufacturing to utililizar natural materials and be dried without the use of furnaces. It also presents a good balance in thermal properties (thermal conductivity: 0.19W/mK, termoacumulación: 0.9MJ / Km 3 ) is a good choice for single-layer walls, but not for multilayer .
There are many other interesting options for bio as Compressed Earth Blocks (CEB) straw bales, adobe , etc. But we would not have considered the non-occupationally acquired to provide us with the blocks and installed. You can find more information in the Journal Ecohousing and enclosures report from the University of Comillas (from which the data termoacumulación and thermal conductivity).
Costs:
(price per m 2 of materials) (price per m 2 of labor)
- L adrillo massif: € 11 € 36
- Termoarcilla: € 8.50 € 16
- Brick drilled: € 3.50 € 26
- Hollow brick: € 2.40 € 24
- ClimaBlock: € 55
- Cannabrick: € 32 € 26
These prices are indicative for bricks made half a foot, do not include VAT and the cost of mortar.
Conclusions:
is impossible to tell which is perfect for eco-building brick. You have to look very carefully at each project, each weather situation and what is to be achieved. What if we have to keep in mind is maximizing the ecology of the materials in the production and use, and this at a reasonable price based on the budget you have. What is clear is that neither nor ClimaBlock hollow brick are suitable materials for the bio.
