Air Barrier Location In Exterior Walls

Air barriers on the other hand can be anywhere in the wall assembly and as plentiful as you like.

Air barrier location in exterior walls. Connections were made to the roof air and vapor barrier two layers of mopped-on asphalt felts that served also as a temporary roof during construction. Determining whether to use a vapor permeable or vapor impermeable air barrierand how to use it depends on a couple of key factors. In cold climates the opposite is true.

The interior gypsum board the exterior stucco rendering the exterior sheathing or the exterior building wrap. Unlike the water-resistive barrier on walls which may terminate at the top of the wall beneath a roof overhang for example an air barrier is a continuous assembly that must connect from one plane of a building to the next. In warm climates the barrier should point to the outside of the house blocking the vapor from the humid outside air that may seep into the walls or ceilings.

This is just as the name implies the air barrier is sandwiched within the thermal layer of the wall. Definition water resistive barrier. The property of having a moisture vapor permeance rating of.

CI puts a supplementary blanket of insulation around the entire exterior of. The air barrier can be any of the following. Verifying the vapor barrier location and the thermal performance of the insulation relative to the dewpoint location.

Exterior air barriers control infiltration of exterior air into the wall cavity and through the attic limit the ability of moist outdoor air to enter the wall cavity during the cooling season and prevent wind-washing of wall insulation ie even though a house tests tight on the interior it could have a leaky exterior wall and top plate that cause big energy losses. Walls behind Showers and Tubs Staircase Walls Walls behind Fireplaces Attic Knee Walls Skylight Shaft Walls Walls Adjoining Porch Roof Air Sealing Attached Garage and Double Walls. This is a four-part blog article the first of which discusses air barrier systems.

The four wetting potentials affecting an exterior wall are. In cold climates interior air barrier systems control the exfiltration of interior often moisture-laden air. Air barrier systems The purpose of an air barrier is to pre-vent the air from reaching a point in the wall cool enough to cause precipitation.