The Slotted Block Tie (Type I) was developed for masonry cavity wall construction where significant differential movement between the veneer and the backup block wythe is expected, such as high walls or multi-storey buildings with full height veneer. The Slotted Block Tie (Type I) allows for up to 50 mm (2") of construction adjustability and differential movement between the veneer and the backup wythe.

Note that as the Slotted Block Tie (Type I) is only capable of transferring forces perpendicular to the wall and not parallel to the wall, composite action cannot be achieved between the masonry wythes. For the design of ShearTruss masonry cavity wall systems (i.e. composite masonry cavity walls), see Fero Block Shear™ Connector.