This code specifies the procedures and practices for waterproofing roofs using bitumen felts. It details the requirements for surface preparation, primer application, bonding bitumen application, felt overlapping, and the handling of critical roof details such as parapets, drains, and gutters.
Lays down the code of practice for waterproofing of roofs using bitumen felts.
Quick Reference Values
Bitumen application rate for bonding1.2 kg/sqm
Bitumen primer application rate0.27 to 0.40 kg/sqm
Longitudinal overlapMinimum 100 mm
Transverse overlapMinimum 75 mm
Minimum roof slope1 in 60
Practical Notes
Ensure the roof surface is bone dry and thoroughly cleaned of dust and debris before applying the bitumen primer to prevent blistering and poor adhesion.
Stagger the joints of consecutive layers of felt in multi-layer treatments to avoid creating continuous weak spots.
Pay special attention to flashing details at parapet walls and roof penetrations, as these are the most common failure points for leaks.