Substrate condition
The surface must be clean, sound and dry enough for proper adhesion. Rusted steel, rotten timber or a wet wall get dealt with first.
Material guide
Closed-Cell Spray Foam Insulation
Closed cell is the denser foam. It resists moisture, it adds rigidity to what it is sprayed on, and it is what we reach for wherever water is part of the picture.
15+ years Family owned and operated7 days Open 7 days, 7:00 AM to 8:00 PMFree Estimates
Free Insulation Estimate
Family ownedOperating since 2010
Spray foam specialistsNot a general insulation reseller
Two crews, two statesNorth Georgia and North Alabama
Lawrenceville based1891 Prospect Church Road
Where it earns its place
The jobs closed cell is usually right for.
Where moisture, structure or limited depth are involved, closed cell is normally the answer.
01
Tell us what you are noticing →Crawl spaces and foundation wallsBelow grade and near the ground, moisture resistance is not optional.
02Rim joistsA small area that leaks a disproportionate amount of air in most houses.
03Metal buildings and pole barnsCondensation on steel is the real problem. Density and adhesion both matter here.
04Shallow framingWhere there is not enough depth for a lighter foam to do the job.
Before we specify it01 02 03
What we settle before closed cell goes on.
Closed cell adheres hard and is not easily removed. Getting the substrate and the thickness right first matters more than with any other product we install.
Thickness for the application
The required thickness comes from the assembly, the application and the code for your area. It is stated in the scope, never assumed.
Clearance for other trades
Electrical, plumbing and any inspection that has to happen get sequenced before we spray, because reaching them afterwards means cutting foam.
The material decision
Closed cell against open cell.
Same decision from the other side. The condition of the space is what settles it.
Denser, adds rigidity
Closed-cell spray foam
- Usually fits
- Crawl spaces, rim joists, metal buildings and any assembly where moisture is part of the picture.
- We check first
- Substrate condition, required thickness and clearance for other trades.
Lighter, expands further
Open-cell spray foam
- Usually fits
- Conditioned roof decks and interior framed cavities inside the envelope.
- We check first
- Expansion room and that it will never meet standing water.
How the job runs
How closed-cell work runs.
Preparation is a larger share of this job than people expect, and it is where the quality comes from.
- 01We assess the substrate
What it is, what condition it is in and whether anything has to be fixed before foam touches it.
- 02We specify thickness and coverage
Against the assembly and the requirement, stated in writing rather than decided on the day.
- 03We sequence the other trades
Anything that needs to be behind the foam happens first. We say what that is.
- 04We install it and stand behind it
The crew that quoted the work is the crew responsible for it.
Closed-cell spray foam FAQs
The things owners usually want settled before they book an estimate.
Why is closed cell used in crawl spaces?
Because a crawl space is a damp environment by nature. Closed-cell foam resists moisture rather than letting it pass through, and it adheres to foundation walls and rim joists well. A lighter, vapour-permeable foam in the same place would be the wrong specification.
Does closed-cell foam add strength?
It adds rigidity to the assembly it is bonded to, which is one reason it is used on metal buildings and pole barns. That is a property of the material, not a structural upgrade, and it is never a substitute for engineering.
Can closed-cell foam be removed later?
It can, but it is difficult and it is messy, because it bonds hard to the substrate. That is precisely why we spend the time on the substrate and the sequencing before it goes on.
Is closed cell always better?
No. It costs more and it is the wrong product for some interior assemblies. Specifying it everywhere is a way of avoiding the decision rather than making it.
How thick does closed cell need to be?
It depends on the application, the assembly and the code requirement where the building is. That number belongs in your written scope after we have seen the building, not in a web page.
Related work
Other parts of the building worth checking.
Insulation problems rarely stay in one place. These are the areas that most often come up alongside this one.
North Georgia · North Alabama
Moisture, steel or shallow framing?
Those are the conditions closed cell is built for. Tell us what you are working with.