REVERA MILTON

BUILDING ENVELOPE RESTORATION

OVERVIEW

FORSMITH Building Science Consultants (FORSMITH) were called in due to ongoing leaks observed penetrating through the roof. The 4-storey construction serves as a retirement home and is built with wood framing. Water intrusion had been a recurring issue and was migrating to the interior, causing extensive damages to the ceilings.

PROBLEM

Upon investigation, FORSMITH had identified areas of substantial water ponding on the roof, measuring water depths of up to 2". The roof assembly consisted of a PVC membrane directly applied onto plywood deck that was fastened to the wooden I-joists, and within the joists was a spray foam insulation. This PVC membrane was observed to be "soft" and it was identified that there was little to no structural support in various areas for the PVC membrane.

SOLUTION

FORSMITH conducted a structural assessment and associated cut tests to determine the structural deficiencies. Findings demonstrated that approximately 40% of the wooden I-joists were rotted due to water intrusion. It was determined that existing communication towers on the roof were compromising the structural integrity of the joists, causing improper drainage of water from the roof, further causing the deterioration of the wooden structure. FORSMITH's recommendations included the immediate removal of the communication towers due to the structural deficiencies.