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Three Story Condo | Portland, OR

Growing_Medium_Image_web.jpgOverburdened roofing, consisting of a combination of 4-5” of growing medium, roof top decks and railings.

 

In Portland, Oregon, this concept was proven, using SlopeShield Plus SA air and vapor retarder with Self-Drying Technology, in an attempt to dry a wetted plywood substrate. Thereby salvaging the existing substrate materials, including the spray polyurethane foam, interior gypsum ceiling.

 

 

 

 

 

 

Existing Roofing Assembly

IBEC Roof Before moisture

The Issue

The Issue Images 01 The Issue Images 02 The Issue Images 03
Residents experienced interior water intrusion as a result of leakage through membrane laps and punctures, plus improperly sealed penetration flashings. Membrane removal exposed wet coverboard, insulation, and plywood substrate materials. The initial moisture meter readings, in the top plywood layer, indicated a moisture content exceeding 40%.

The Problem

The Solution: SlopeShield Plus SA

The Solution Image 03

SlopeShield Plus SA allowed the double plywood roof deck to dry out over a period of approx. 45 days. Using a Delmhorst BD-2100 moisture meter, measurements taken at regular intervals, documented downward moisture levels in the decking material. The closed cell foam acted as a vapor barrier, negating any downward drying. Only upward moisture movement through SlopeShield SA Plus could take place. 

Remediating leaks through rooftop amenity spaces is an expensive process that requires total removal of the overburdened roofing, membrane, and saturated materials, including coverboard, insulation, roof deck, cavity insulation, and interior ceiling. This work is costly (high disposal fees, complete material replacement) and results in temporary resident displacement and revenue loss for the property owner.

Remedy and Findings

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The existing materials were removed down to the plywood. The entire deck was covered in SlopeShield Plus SA, allowing the damp substrates to dry through upward moisture vapor diffusion.

 

 

 

 

The Results: Minimal Impact to Occupants and a New Roof

IBEC Roof After

With a target moisture content at or below 15% it was determined the materials could be reused and the subsequent new roofing components (see above) could be installed.

 

 

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