Matwell frame to create, finish and protect a recess in the sub-floor that is used to accommodate an entrance barrier mat. ENTRYTEC BU can accommodate entrance mats up to 23 mm in thickness and is reversible to allow quick installation of the most popular mat thicknesses (18 mm and 23 mm). The matwell can also be infilled with screed to suit thinner gauge entrance mats. The matwell frame is supplied with fixing connectors for easy on-site assembly and is fixed to the substrate prior to screeding and mat installation.