Roof Blown Insulation Ventilation

Traditionally insulation materials that are placed inside of an attic will require air circulation within the attic space to assist in drying excess moisture in this indoor space.

Roof blown insulation ventilation.

Wind can blow up through soffit vents disturbing insulation and moving it out of place. Beyond the decreased capacity for insulation when venting the roof deck venting the roof deck or the attic has some other drawbacks worth considering. This is especially true with loose fiber insulation that has been blown into the attic. Good roof ventilation can do this but shingle color sun exposure and insulation are exponentially more important to overall energy efficiency than ventilation.

Blown in cellulose is an environmentally friendly material made from recycled newspaper so it s easier on your skin and lungs. Vents placed in the underside of the roof s overhang or soffit provide a means for air to get into the attic to help cool it in the summer months. The hole is then. Blown in cellulose has a higher r rating and is less expensive than either blown insulation like fiberglass attic insulation or fiberglass batts.

Too many people believe the importance of roof ventilation is to increase energy efficiency during the summer. For the same reason insulation shouldn t touch the roof s underside. Staple plastic or foam baffles to the roof sheathing near the eaves to keep the material away. When is the best time to replace attic ventilation.

To be sure your roof is getting enough ventilation there are simple calculations that you can follow. To install blown in insulation in existing walls holes are drilled at the top of each stud space usually on the exterior and material is blown in via a long flexible hose. Insulation is used in an attic for cross ventilation to minimize potential for moisture accumulation and condensation to help energy savings and moisture control. When hvac equipment is in the attic insulation and an air barrier at the roof line brings that equipment within the conditioned enclosure envelope thereby allowing it to operate in more favorable temperature and humidity conditions without air leakage and heat loss gain directly to the exterior.

February 10 2020. In cold climates snow can enter the soffit and ridge vents melt and potentially cause rot. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. Unfortunately blow in insulation can drift into.