Air barrier paper is a permeable sheet material used as both a vapor retarder and air barrier to protect the house from unwanted air infiltration. Attic ventilation is needed through soffit, ridge, and gable vents to allow moisture and heat escape to keep the attic and house cool. Roof turbines further aid ventilation by extracting warm air from the attic. Rebar is embedded in concrete with grooves to grip the concrete and act as a unified structure once set.