07 Thermal + Moisture Protection

Fluid Applied Air & Weather Barrier: Prosoco & Sill Dams

Allied8 - Lessons learned from Orcas window and door install (Anderson E Series used with Prosoco):

1. Where Prosoco system is used, a sill dam can be used in conjunction with the Prosoco Air Dam product at doors and windows in the same manner.

2. Full sill pans are discouraged since they span from exterior to interior and introduce condensation on the inside of the door or window units. This concept needs further considering when using a sheet good flexible membrane system.

3. Instead, install a simple L-angle at the inside edge of the window or door sill, with cut ends that can fold up the jamb. The L-angle can be 1" where it's against the floor with a 1/4" to 1/2" vertical leg. The horizontal leg should be wet set in Prosoco Fast Flash and Prosoco Air Dam should be used to cover the vertical leg as a last step of the install.

4. Prosoco Air Dam is ideally installed just after all windows/doors are installed because the building is not air tight until that step is complete. Water intrusion can still happen up until Air Dam is installed.

5. Prosoco Air Dam installation instruction say that a 1/4"-1/2" backer rod needs to be installed all 4 sides and then Air Dam gets caulked against that but the shim space can often by less than 1/4" and therefore a backer rod can't be installed. In that case. Air Dam can be installed along the inside edge of the window and door units like a standard caulk joint.

6. We should assume 3/8" shim space at all sides of window/door units (rather than 1/4") because the fluid applied Prosoco is thicker than most flexible membrane build up.

If you guys have questions, let me know. If this feels solid, then I will add it to Wiki. For reference, this is the complete system used at Orcas.