GOOD
Open Cell Spray Foam
BETTER
Hybrid System – CCSF & Batts
BEST
Closed Cell Spray Foam
OPEN CELL SPRAY FOAM
Open cell foam insulation is a type of foam insulation that consists of small pockets that aren’t completely enclosed. This foam expands a lot and remains relatively soft and flexible. It creates an effective barrier against air movement and sound, and is useful in walls, ceilings, and roofs. However, it is more likely to absorb moisture and vapor, so it can require the addition of a vapor barrier in many applications. Open cell foam insulation creates an R-value of around 3.5 to 3.6 per inch. It is lightweight, pliable, and easy to work with.
If you compare the costs of open cell and closed cell spray foam, you will find that open cell is less expensive. The total cost to insulate with open cell is usually 30% to 50% lower than with closed cell foam.
PROS:
- Provides twice the sound resistance in normal frequency ranges than closed-cell foam
- Requires less materials than closed-cell foam for greater affordability
- Accommodates long-term creep, or slow flow, and seasonal movement to prevent deformations and shifts in placement over time in response to the influence of temperature and other stresses
CONS:
- Durabilty – we advise covering open cell spray foam with a wallcovering such as sheetrock, plywood or metal to protect it from weather and people and/or objects.
- OCSF doesn’t interact well with existing loose fill insulation in attics. Sometime existing attic insulation will need to be removed prior to application.
- Requires ambient temp 50 degrees or higher for application to adhere.
CLOSED CELL SPRAY FOAM
Closed cell foam spray is a type of polyurethane foam that forms an air seal and has a high R-value. It is water-resistant, durable, adhesive, and warm. It can be used in interior and exterior applications, both above and below grade, and in different types of buildings. It expands 30 times its liquid volume and uses an inert gas as a blowing agent. It can also reduce additional costs and optimize energy efficiency by performing as an insulation, air barrier, vapor retarder, and water resistive barrier.
The most common type of SPF, closed-cell foam is much denser and boasts a higher R-value than open-cell foam. This means that it’s significantly more resistant to heat flow, as well as water penetration and moisture buildup. Closed-cell foam can also withstand water in large amounts, making it a great choice for homes in flood zones. In addition to these qualities, closed-cell foam also features a glue-like tenacity, which adds structural strength to walls, ceilings and other areas of the home.
From new construction to retrofit applications, closed-cell foam makes an excellent air and moisture barrier and vapor retardant.
PROS:
- More durable than open cell spray foam.
- Withstands hail-related damage and roof leakage during hail storms
- Reduces mold and mildew growth by minimizing air infiltration
- Offers excellent wind uplift resistance in areas prone to hurricane-force winds
CONS:
- All foam installation can be cost-prohibitive for full home applications.
- Spray foam is more flammable than fiberglass. It will burn but will not spread (ignition barrier can be applied)
- Spray foam requires ambient temp 50 degrees or higher for application to adhere.
GOOD
Open Cell Spray Foam is great when walls are to be covered up, and for vaulted ceilings, she-sheds, detached garages, shops, and rooms seldom entered such as well houses.
BETTER
A more efficient solution is our Hybrid System, a thin layer of Closed Cell Spray Foam with a Fiberglass Batt on top. This is a great option for conventional homes or retrofitting homes.
BEST
Go with Closed Cell Spray Foam anywhere top efficiency is required, such as walk-in coolers, container homes and tiny homes, and when the insulation will likely be exposed to elements or trafficked areas. Metal buildings require Closed Cell Spray Foam.
