EnvelopeSealant™ is designed to eliminate moisture control failures in the window/wall interface that result from obsolete installation practices associated with flange-mounted windows and doors.
When flange-mounted windows and doors were introduced to replace wood brickmold windows, installation practices remained the same even though product performance, composition, manufacturing methods, installations details and service energy performance had all changed.
Wood brickmold window installations relied on the ridged brickmold offering a compression seal of building paper between the window and a wall substrate. This compression seal is not feasible with flange-mounted window and door products. Fragile flanges are easily broken or tented, eliminating the critical compression seal. Rough openings that are too large, allowing for airflow through pre-punched nail holes on the flange, create additional risks. These allow moisture or vapor to penetrate the building paper and wall detail.
EnvelopeSealant™ provides a clear, cost-effective solution to these problems. Other companies offer dap-like caulks but evidence shows persistent and costly failures. These caulks have not undergone the specific testing (CCMC and CGSB/ASTM) required for use at the window/wall interface.
The EnvelopeSealant™ and BEC pan flashing system offers all the necessary elements for a successful window installation:
EnvelopeSealant™ has shown an 8-43% reduction in installation/airflow. Window manufacturers and post secondary technical institutions identify EnvelopeSealant as an advanced method of window/wall interface detailing.
Materials and methods are constantly changing and evolving. That's where BEC experience has been proven to make the difference.
