Roof Replacement: 2-Ply Modified Bitumen Waterproofing System (asphalt-adhered base sheet with a heat-welded cap sheet).
A high end body shop servicing luxury vehicles had an aging roof with many active leaks. Specified Roofing was employed to replace the existing waterproofing system and its components, while taking into consideration the operation of the facility below and its valuable contents inside the building and throughout the property.
The existing 4 ply Built Up Roof (BUR), was well beyond its serviceable life. Active leaks were occurring throughout the facility and many previous membrane repairs had occurred.
The existing Built Up Roof membrane, thermal insulation and vapour barrier was removed to expose the steel deck. This steel deck was swept clean and visually inspected for signs of deficiency prior to the re-instatement of the new waterproofing system.
During the course of replacement, redundant and obsolete penetrations were removed (with new steel deck being applied over the penetrations). The removal of these obsolete items is recommended as roof top penetrations require a varying degree of annual maintenance.
The new roof was assembled in the following fashion: vapour barrier was adhered to the steel deck with mechanically fastened mineral wool insulation (ship-lapped) laid over top. A base sheet of modified bitumen membrane was adhered to the insulation with hot asphalt, followed by a granulated cap sheet heat welded into place.
A close up view of the base sheet installed throughout the field.
Upon completion of base sheet installation, a granulated cap sheet was heat welded throughout the field. The granulated cap sheet prevents premature UV deterioration, protecting the waterproofing membrane from decay.