AS 3740:2021 Waterproofing of Domestic Wet Areas 4.10: 4.10 Fillets and bond breakers for bonded membranes

For membranes bonded to their substrate, fillets or bond breakers are used at every change of plane or material and at movement joints, of a type matched to the membrane's flexibility class under Table 4.10: Class I (elongation at break 10 % to 59 %) needs a minimum 100 mm bond breaker or tape; Class II (60 % to 299 %) 35 mm; Class III (300 % or more) 12 mm. Inside the internal angle of a waterstop no fillet or bond breaker is required.