The first course should be laid on cement-mortar bed of thickness about 1 to 3 cm depending on the evenness of the base and should maintain a correct level for fast installation progress in the following courses. It is recommended to spray the mortar face of the block before installation to keep damp at erection time especially during the hot seasons. After installation, spray with water twice a day for 3 consecutive days for curing of the mortar. Three types of Mortars can be applied on the succeeding courses:
Glue for Siporex (BONDCHEM – for thin joints):
Pre-mixed mortar – only water is to be added. Thickness of glue should not exceed 3 mm in horizontal and vertical joints in order to achieve the ideal consumption rate as follows:
7 kg/m2 for Siporex blocks 25 cm thick 6 kg/m2 for Siporex blocks 20 cm thick 5 kg/m2 for Siporex blocks 15 cm thick
Ordinary Mortar with Gesol
1:6 Cement : Sand (by volume) respectively in addition to water (with 10% of Gesol). The erection can be carried out normally as for conventional blocks. (Gesol is a liquid material used as bonding agent and retardant for the mortar especially during hot weather. Gesol is available at Siporex factory in 3 kg and 25 kg plastic containers).
Ordinary Mortar with Lime:
1:1:10 Cement : Lime : Sand (by volume)