Improved brick masonry quality 

Masonry mortar is mixed at the construction site by adding water to fabric made dry mortar. Unlike other mixing processes on site where weight or volume gives the mixing ratio, masonry mortar is mixed to the preferred consistence of the mason. However, variation in the mortar water content has a major impact on the bond between mortar and brick, and thus on the quality of the finished brickwork.

Using wet masonry mortar gives best adhesion to brick and thus best flexural strength, initial shear strength and rain resistance. The variation in mortar water content used at Norwegian construction sites is large and influence the brickwork quality considerably. We recommend a clearer indication of the water addition to the fabric made dry mortar to ensure stable and good brick quality.

Scientific basis

  • Slapø, F, Kvande, T, Høiseth, K.V, Hisdal, J-M & Lohne, J: Mortar water content impact on masonry strength. Masonry International 2018, Vol 30(3), p. 91-98; ISSN 2398-757X
  • Slapø, F, Kvande, T, Bakken, N, Haugen, M & Lohne, J: Masonry’s Resistance to Driving Rain: Mortar Water Content and Impregnation. Buildings 2017, Vol. 7(3), p. 70; doi:10.3390/buildings7030070, ISSN 2075-5309 (Published online 9 August 2017)