You can use rigid foam panels or do as Tom Silva does with nearly all houses these days: Hire a pro to install spray foam insulation. Foam blocks airflow needs no vapor barrier and has a higher R-value per inch than loose fill or batts, so you’ll get more protection with less depth.
What is the best insulation to use in your attic?
Spray Foam Attic Insulation
Spray foam offers the best attic insulation performance available. Choose from two types: closed-cell and open-cell, aka 2-pound and ½-pound, respectively. They sport insulation values of approximately R-6.5 and R-3.6 per inch, respectively.
What R-value do I need for attic?
R-30
Depending on where you live and the part of your home you’re insulating (walls, crawlspace, attic, etc.), you’ll need a different R-Value. Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces.
Where should you not use spray foam insulation?
When NOT to Use Spray Foam Insulation
- For areas that are too close to electrical boxes:
- For areas too close to ceiling light boxes:
- Open-cell spray foam on your roof:
- For closed-cavity spaces:
- If you have a history of skin, respiratory, or asthma problems:
What is the most effective roof insulation?
One of the most common and effective ways to insulate your roof is with polyurethane spray foam. This spray-applied plastic is known to be highly effective for sealing any cracks as well as resisting wind and heat. The foam is applied to the underside of your roof deck and directly onto the slates and tiles.
Should I use spray foam insulation in my attic?
Closed-cell spray foam is a better choice for keeping subfloor moisture at optimal levels, while open-cell spray foam is a better choice for walls and attics, because it allows homes to “breathe.”
What is better batts or blown-in insulation?
Practical and durable: When comparing batt insulation vs. blown cellulose, keep in mind that batt insulation is a more effective thermal barrier. The thermal performance of loose fill insulation will not last for the life of the building. Most blown-in insulation materials will settle and lose R-value over time.
Can you put too much insulation in an attic?
It’s possible to over-insulate an attic as too much will cause moisture buildup and eventually result in mold. Eventually, adding more insulation leads to diminishing returns in trapping heat as well.
How many inches of insulation do I need in my attic?
about 10 to 14 inches
The recommended level for most attics is to insulate to R-38 or about 10 to 14 inches, depending on insulation type.
Is R-38 insulation Good for attic?
So, for your attic insulation, we have a minimum standard of R-38, and a recommended standard of R-49. R-Value is explained as thus: “the resistance, or strength of a material to slowing down the flow (movement) of heat”.
What is the cheapest way to insulate a roof?
What Is The Cheapest Roof Insulation? The cheapest type of roof insulation is fibreglass (also known as glass wool). Fibreglass roof insulation is the cheapest type of insulation you can buy.
Can I insulate my loft myself?
If your loft is easy to access and has no damp or condensation problems, it should be easy to insulate – and in many cases, it is possible to do it yourself. If access is easy and your loft joists are regular, you can use rolls of mineral wool insulation.
Should you insulate attic roof rafters?
Insulating between rafters will do no good, because the attic should be ventilated, and the rafter insulation would be between two unheated spaces. You can add insulation to the floor; the more the merrier. Just don’t put it in the eaves. Also, make sure the attic is well ventilated.
What are the disadvantages of spray foam insulation?
List of the Cons of Spray Foam Insulation
- Spray foam insulation does not always fill every possible cavity. …
- Spray foam insulation might encourage water damage for some homeowners. …
- Spray foam insulation can sometimes shrink. …
- Spray foam insulation requires a lot of experience to get it right.
Which is better spray foam or fiberglass insulation?
Spray foam insulation has a higher R-value than fiberglass, making it a better insulator. Another difference between them is that spray foam is watertight while fiberglass cracks under moisture. However, installing spray foam requires a professional while fiberglass is easy to install yourself.
Is spray foam insulation Safe 2021?
After proper curing, spray foam insulation is safe and should not cause any health-related or even structural problems in your property. However, it is highly important for you to call a licensed insulation contractor to install this type of insulation in your property.
Can I spray foam my attic myself?
Quote from Youtube video: Make. It so it's not hot in the summer. It's not cold in the winter. And we do that by moving a thermal and air barrier to the bottom of the roof deck. Instead of the attic floor.
Can rats eat expanding foam?
Some people combine this with expanding foam, to improve the cosmetic appearance and prevent drafts. However, expandable foam alone will not stop rats – they will chew through it.
How long does spray foam insulation last?
Typical Insulation Lifespan
The International Association of Certified Home Inspectors states that spray foam insulation, wrap tape and housewrap insulation can last for more than 80 years. At the same time, cellulose, loose-fill, foamboard, loose fill and rock wool insulation can last up to 100 years.
Will termites eat through foam insulation?
Researchers have concluded that termites do not eat the foam board insulation but they will tunnel through it. Insulation also provides potential protection from predators and also retains moisture, two requirements of termites.
Can spray foam rot your roof?
Studies show that open-cell spray foam is risky in colder climates. Indoor moisture diffuses through the foam and comes in contact with the cold roof sheathing. The spray foam traps the moisture against the roof, which results in eventual decay.
