Romanesque architecture in Italy halted the construction of wooden roofs in churches, and also experimented with the usage of the groined vault or barrels. The buildings' weight tended to buckle on the outside, and there used to be buttresses to support the buildings. Church walls using the Romanesque tended to be bulky and heavy to support the roof, however this meant that Romanesque church interiors in Italy tended to be far more banal and bland than those of the Early Christian and Byzantine periods. They used to simply consist of marble or stone, and had little decoration, unlike the rich mosaics found in Italian Byzantine architectural works.