Blown Insulation Attic Vents

Blowing insulation into walls is best left to the pros because it involves drilling into stud spaces that may contain electrical.

Blown insulation attic vents.

Batt and roll insulation works well between joist and stud spaces or if you have a wide open space or a crawlspace. We offer our review of the three most popular types of attic insulation with a look at each one s pros and cons. Your options for attic insulation range from radiant barriers to sheets of mineral wool but most homeowners stick with products made from cellulose or fiberglass. Batt and roll insulation and loose fill sometimes known as blown in insulation.

Unfortunately blow in insulation can drift. Earlier this year i got a question about a home that had spray foam insulation in the attic. There are two main types of insulation. See install batt and roll insulation for details.

Nothing unusual about that. The airflow from the soffits to the ridge vent keeps the roof cool and prevents ice dams and the material will block that flow. Blown insulation may require an additional block to prevent insulation from being blown into the soffit. This is the most common type of insulation you ll find in attics.

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 number of vents in your roof will depend on the size of your attic. Cellulose blown in ceiling insulation is a good choice for diyers. A lot of builders and homeowners are going with spray foam insulation because of the airtightness benefits but then the questioner mentioned that the spray foam contractor had intentionally left big holes to the outside by not sealing the gable vents.

A piece of rigid foam board placed on the outer edge of the top plate works very well for this. Spray polyurethane foam is a chemical product that is created by two materials isocyanate and polyol resin that will react with each other when they are mixed and will expand up to 30 to 60 times its liquid volume as it is sprayed in place. Loose fill blown in insulation is best for tight spaces or if your attic already has a layer of insulation. Blown in cellulose has a higher r rating and is less expensive than either blown insulation like fiberglass attic insulation or fiberglass batts.

Once they are in place you can then place the batts or blankets or blow insulation right out to the very edge of the attic floor. This alternative to traditional building insulation fiberglass can be applied into wall cavities holes concrete slabs and even onto roof tiles and. The standard is one square foot of venting for every 150 square feet distributed evenly between the soffit and roof vents. Blown in spray foam batts and blankets.

Covering up the soffit vents with loose fill or batts which can happen if you stuff insulation along the eaves is a huge no no. Blown in cellulose is an environmentally friendly material made from recycled newspaper so it s easier on your skin and lungs.