Pre-formed threshold & upstand systems

Pre-formed extruded aluminium threshold upstand profiles are purpose-designed sections that are installed at the balcony door sill to form the hob in a single piece rather than casting or building up the hob in cementitious mortar. The aluminium section provides a structural substrate for the waterproofing membrane termination, incorporates a positive waterproofing termination at the top of the upstand, and often includes an integral sill drainage channel or weep outlet feature. The profile is fixed to the concrete slab or substrate with 316 stainless screws in a bed of compatible sealant, and the waterproofing membrane is then applied up and over the upstand to terminate at or above the top of the profile. The profile height must comply with the NCC and the project waterproofing specification for the finished hob height above the waterproofed surface. Anodised or powder-coated finish — confirm colour and coastal requirements with the supplier. All fixings must be 316 stainless. Confirm specific profile dimensions and compatibility with the waterproofing system before specifying. TODO: owner confirm — confirm preferred proprietary aluminium threshold profile and supplier before specifying.

316L stainless steel pre-formed upstand angles or threshold profiles are used in coastal and high-exposure balcony door hob applications where an aluminium threshold profile would corrode over the design life. A 316L stainless equal angle (e.g., 50×50×3mm or similar, depending on the required hob height) is used as a pre-formed upstand, fixed to the slab in a bed of compatible sealant with 316 stainless screws. The waterproofing membrane is taken up and over the upstand and terminates at or above the top of the angle. In some applications, a custom fabricated stainless channel or angle with welded end caps is used to form a continuous waterproof trough at the threshold. Confirm profile height meets NCC minimum hob height requirement for the specific application. All fixings must be 316L stainless (not 304). Confirm membrane-to-stainless adhesion with the waterproofing manufacturer — some membranes require a primer for adhesion to stainless steel. TODO: owner confirm — confirm preferred profile configuration and waterproofing system compatibility before specifying.

Proprietary composite threshold upstand systems are purpose-designed products that combine a structural threshold profile, integral drainage channel, waterproofing termination rebate and often a door frame sill seal in a single pre-engineered unit. These systems are designed to provide a complete balcony door hob solution without the need for formwork and concrete construction. They are available from specialist waterproofing supply companies and building hardware suppliers. The composite unit is fixed to the slab in a bed of sealant and the waterproofing membrane terminates into a pre-formed rebate in the profile. Drainage is managed through an integral weep channel that exits through the profile to the exterior. Confirm Australian availability, NCC hob height compliance, coastal suitability of materials and compatibility with the specific waterproofing system before specifying. TODO: owner confirm — confirm specific proprietary product, Australian supplier and NCC compliance before specifying.