The function of the Water Barrier System is to:

• Protect the wall assembly from the effects of wind, rain, snow and sun
• Improve envelope thermal performance by keeping wind out
• Work in concert with flashing to divert bulk water out and away from the wall.

The water barrier system is often referred to as the weather barrier.

Water Barrier Criteria

• Installed towards the exterior
• Resistant to air flow
• Able to shed rain or snow
• Able to withstand the forces that may act upon it
• Durable during construction and over expected building life

It is very important that the water barrier is installed properly before insulating the interior of the building.

The water barrier will reduce bulk water from entering the building.