Doubled vapor barriers in attic.
Old brick buildings with basements venting into attic.
Laying a second layer of fiberglass batts in the attic is an easy way to boost r values.
As a result moisture is no longer allowed to migrate freely throughout the building envelope.
Oct 6 2019 explore donnapfingst s board attic vent on pinterest.
Instead fresh air still flows in through the soffit vents and travels along the underside of the sheathing until it reaches a ridge vent or can be vented with another type of exhaust vent.
Trapped moisture in masonry construction if not addressed can lead to problems such as spalling.
Vent roofs with steeples towers or cupolas can be found in different buildings from barns to cathedrals.
See more ideas about attic vents gable vents vented.
However my architect says that on a prior project a consultant from building science recommended leaving an airspace between the brick cmu and the spray insulation.
Why ventilation advances in building construction techniques have led to a structure which is significantly more energy efficient and air tight than in years past.
The building codes and building science for.
But if the new layer has a kraft paper backing it can trap moisture and turn the layers underneath into a soggy mess.