GreenTips

Masonry materials range from natural stone to cement based blocks to brick, straw bale and mud brick. The energy used in production is dependant on factors such as cement content, extraction methods of the raw materials, drying methods and distance travelled from the production source.

In general, the more natural the material the lower the embodied energy. However, due to the cement content, the embodied energy of some prefabricated mud bricks can be surprisingly high. Because of the density of masonry products it is generally better to source it locally.

With careful detailing most masonry systems are extremely durable and weather resistant, with a possible lifespan of several centuries. Their natural durability means that the use of paints, sealants and other surface treatments can be avoided. Straw bale and mud brick systems are much less durable than other masonry systems and so careful detailing will be required to protect them from the elements.

Salvaged bricks are readily available in New Zealand. The strength of mortar is an important consideration in the installation of brickwork. Mortars which are less strong than the brick allow brickwork to be recycled.

Masonry construction can offer the benefits of high thermal mass, aiding in passive or active solar heating, To be effective, however, it must be located within the insulation line of the building. The EECA website offers a simple guide to the use of solar mass in housing.

Most masonry systems provide poor thermal insulation and therefore always need to be used in conjunction with insulation systems.

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