It takes the right mortar to build monolithic masonry in line with high energy efficiency standards. Franken Maxit in Azendorf, Bavaria, has developed a thin-bed mortar – “maxit mur 900 D“ – especially for satisfying the pertinent criteria according to the covering method. As a system product, it scores high in several respects thanks to its specific properties: Compared to the “rolling and dunking“ method, this lightweight mortar saves up to 20% working time on average. Make that up to 30% compared to clay block masonry. At the same time, it helps minimize mortar consumption and displays very convincing processability.
Fast, safe processing
The covering thin-bed mortar process is specially tailored to the use of high-precision clay masonry units, a.k.a rectified clay blocks. The term “covering“ stands for a fast and simple manner of installation in which a mortar sled is used to reliably achieve full-area application of the mortar. Unlike other methods – like the “rolling and dunking“ of blocks – this approach enables full coverage of the blocks. The sled is simply pulled uniformly along the joint, leaving behind no unevenness on the face and producing a nearly jointless masoned wall. The thin-bed mortar is only about 3 mm thick on application, and once the clay units have set and the mortar has cured, the residual thickness of the continuous joint is a mere one millimetre.
Main merits of the covering thin-bed method
maxit mur 900 D mortar is purely mineral based. Used on high-precision clay masonry units, it enables construction of “purely mineral“ masonry. Thanks to the thin-bed mortar‘s minimal shrinkage, there is little risk of stucco-base-induced cracking in exterior walls. Since as much as 85% less mortar is consumed, the construction costs are appreciably lower, too, even though the compact clay block wall displays better structural strength than a thick-bed mortared one. The compressive strength of thin-bed mortar 900 D (M10 according to DIN EN 998-2) gives the precision clay masonry wall superior resistance to potential stress loads. With a thermal conductivity coefficient of 10,dry = 0.21 W/(mK) covering thin-bed mortar nicely enhances the thermal insulating power of exterior walls.