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Unvented (conditioned) attics use air-impermeable insulation as a barrier to prevent moisture condensation on the underside of roof decks. Vented attics minimize condensation by allowing the escape of moisture to the exterior by air flow.
It depends on the use of the building, the climate and the materials of construction. In normal occupancies and moderate climates, SPF insulation typically does require a vapor retarder. Extremes of climate and building use may require vapor retarders / barriers. Check with your design professional for specific recommendations and refer to SPFA technical document, AY 118, Moisture Vapor Transmission for further information.
- SPF provides a continuous air barrier
- SPF prevents moisture infiltration through air leakage
- SPF minimizes dew point problems and condensation
- SPF avoids thermal bridging
- SPF resists heat movement in all directions
- SPF provides reliable performance under varying conditions
If you have a question, feel free to call or email us today. Here are
some FAQ from
Agile Spray Foam!
No, the application of SPF insulation to the underside of the roof deck minimizes the potential for condensation. The SPF insulation develops a thermal and moisture gradient that avoids the development of dew point conditions in the attic. Because of this, moisture won’t condense or accumulate and, therefore, does not need to be vented to the exterior.
Both low and medium density SPF effectively reduce noise from outside sources by sealing cracks and gaps that allow sound to travel through the walls, floors and ceilings into the building. They are less effective against noise caused by vibration.