Traditional Mortar System
With the exception of H+H Vertical Wall Panels and Jumbo Bloks, all H+H aircrete can be used within a traditional mortar system.
Mortar is a material used to bind masonry blocks together. It acts as a sealant and provides a barrier to the passage of moisture. The correct designation of mortar is essential for giving strength to a wall structure and keeping it watertight.
As a general rule cement:lime:sand mortars give a stronger bond than plasticised mortars of a similar compressive strength.
For building mortars, one volume of cement is required for three volumes of sand to give a durable mix. However, this strength of mortar is not always required.
Mortar designation (iii) (1:1:5 to 6) is the strongest that should be used with traditional blockwork above the Damp Proof Course (DPC) level. It is generally suitable, provided structural considerations do not demand a stronger mix and the masonry is protected during construction from saturating and freezing.
Below DPC level, mortars of designation (ii) (1:1/2:4 cement:lime:sand) particularly where there is a risk of freeze/thaw, or (iii) may be used, according to soil conditions.
With the exception of H+H Vertical Wall Panels and Jumbo Bloks, all H+H aircrete can be used within a traditional mortar system. For information on the types of aircrete suitable for building below DPC, see Celcon Foundation Blocks and Celcon Blocks, Standard Grade.