3 Words to use with buttressing

The little building just across the way was the Guild House of the Arte della Lana, or Wool-combers, and is now the head-quarters of the Italian Dante Society, who hold a conference every Thursday in the large room over Or San Michele, gained by the flying buttress-bridge.

Narrow buttress strips on either side and between the windows run through and serve to connect the stories.

Beginning to show signs of sinking, it was raised in the fourteenth century, and was strengthened by the introduction beneath it of inverted buttressing-arches, which give to the interior a strange effect.

3 Words to use with  buttressing