Galego | English

Non fiction

Gornecidos e lucidos con xeso. Confección de gornecidos e lucidos con xeso

By Marta Fernández Pérez, Jorge Costal Blanco, Juan Ignacio del Campo Domínguez

About this book

Learning how to be a bricklayer does not mean getting to the site, having a look and getting to work. We build the foundations, roofs, walls and coverings and this is not something that can be learnt overnight. As in any other job, the worker needs training that allows her or him to gain the necessary knowledge to successfully develop her or his work on site, and understand each part and how the parts are organised.

Ideaspropias Publishing has developed this training manual for those workers who make fillings, levelling and also for those who work with mortar and paste, vertical horizontal or tilted walls or who want to do so in the future.

Book fragment

Characteristics of plaster

  • Solubility: Plaster is soluble in water and therefore cannot be used outdoors.
  • Volumetric increase or expansion: Plaster suffers some expansion when there is forging and slight retraction, when dryness occurs as a consequence of water evaporation. Later on there is the final bulging state, approximately 1% of which is caused by environmental moisture.
  • Mechanical strain: Higher or lower strain shall depend on:
  • The quantity of water in the mixture; if the quantity is higher, the lower the strain (due to the number of pores in hard plaster)
  • The impurities of plaster: the more impurities, the lower resistance it has.
  • Adherence and corrosion: Plaster shows bad adherence to stone and timber but it shows good adherence to ceramic and metal products. Plaster cannot be directly applied on metals, as they would rust. Whenever both materials are in contact, metal must be protected with an anticorrosive coating.
  • Fire resistance: It provides good fire resistance, as it is neither flammable nor combustible.