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Mixing

To overcome any potential segregation that may occur during transit, the contents of each bag should be mixed before use. The material can be mixed mechanically in a free fall mixer for 3-4 minutes or hand mixed by placing an amount of the dry powder onto a clean, flat surface and slowly adding clean water in increments and mixing continuously with a shovel until the desired workability is achieved. For masonry units that have a high absorption and/or where high ambient temperatures are expected, rapid moisture loss from the mortar can be prevented by pre-wetting the masonry units.

For optimum results, approximately 3.5 to 4 litres of clean water should be used per 25kg bag and each mix of mortar should be used within 120 minutes, after this time it should be discarded. Refrain from excessive water addition, as this will weaken the mix, delay setting times and adversely affect durability. There is no need to add further additives or admixtures to the material on site as all required plasticisers/workability aids are already incorporated into the mix.

After Laying

The finished mortar should be protected against the effects of the prevailing weather conditions such as, frost, rain and when conditions are dry and/or windy rapid moisture loss should be avoided by covering with plastic sheeting or damp hessian.

Coverage

Each 25kg bag of CEMEX M4 & M12 Natural Mortar will yield approximately 12 litres of fresh mortar, sufficient to lay approximately 20 standard house bricks or 12 100mm blocks laid with a uniform 10mm joint.