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Window installation involves the fixing of window frame at an earlier construction stage and subsequent installation of the window sashes. This is a highly workmanship dependent process. INSTALLATION OF WINDOW MAIN FRAME There are three window framing systems commonly used in the local industry. These are cast-in window system, sub-frame system and lug system. CAST-IN WINDOW SYSTEM The implementation of cast-in window system requires coordination between the window fabricator and the precaster.

Proper handling and protection are important throughout the precast process, delivery and erection of the precast wall panels. Protection of the frames should remain intact throughout the construction phase to avoid physical damages to the frames, which could be costly to rectify or replace. SUB-FRAME SYSTEM The sub-frame system comprises a sub-frame which is either cast in or anchored to the wall.

The main frame is then installed onto the sub frame at a much later stage of the construction. Proper alignment and setting out of the sub-frame are crucial in ensuring the ease of operation of the window. LUG – SYSTEM The lug system is commonly used for installing window frame on plastered walls where the lugs can be fixed to the wall and embedded in the plaster