Open-cell foam insulation in Mount Pleasant SC - a sealed attic that stays dry
A hot upstairs and a climbing power bill usually start in the attic. Open-cell foam under the roof seals and insulates it at once.
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Is open-cell spray foam the right fit for your attic?
Open-cell foam insulation is sprayed onto the underside of your roof deck, where it seals air leaks and becomes the main insulation for the house. For many Mount Pleasant homes, it's how we bring a hot attic, and the ductwork in it, inside the cooled part of the house.
Most people who call me have a hot room upstairs, a drafty house or an attic they aren't sure about, and they'd like to know whether foam is worth it. The price turns mostly on how much roof deck there is to cover, how deep the foam needs to go, whether the roof needs repair first and whether old material calls for insulation removal before we start. The schedule depends on any roof repairs, the permit check and the time your family spends out of the house while the foam cures. At the estimate I look over your attic and explain what I found and what I'd suggest, so you have a figure for your own house.
How can you tell your attic needs better insulation?
A hot room upstairs
If the room over the garage or the bonus room stays hot while the rest of the house is comfortable, the attic around it is usually full of hot air leaking in through open gaps. Every month it waits, the air conditioner runs longer trying to catch up, and you pay for that on the power bill.
Sweating ducts in the attic
Ductwork in a hot attic can drip where cold air inside meets warm, damp air outside, and you may notice rust on the hangers or wet spots on the insulation below. Left alone, that water finds the drywall and shows up as a stain on your ceiling.
Drafts and a climbing bill
If you feel air moving around can lights, the attic hatch or where pipes come through, the insulation you have is fighting a draft it can't stop. The longer those gaps stay open, the more you pay to heat and cool air that's slipping out of the house.
How we install open-cell foam insulation
I start with the roof, because foam shouldn't go under a roof that leaks, and I look over the attic for old wiring, water stains and fuel-burning appliances before we plan anything. Open-cell foam insulates well but doesn't hold back moisture vapor, so before anything is sprayed we settle how the attic will stay conditioned and dry once it's sealed. On install day our crew seals the gaps around pipes, wires and the hatch, closes off the old attic vents and sprays the foam across the underside of the roof deck, carrying it all the way to the edges, where coverage tends to run thin if nobody watches it. When the spraying is finished, we clean up and air out the house.
Some calls reach beyond the attic. If you own or manage a shop or office, our commercial insulation work follows the same careful steps, and if questions about moisture come up elsewhere in the house, I can look at whether a crawl space vapor barrier belongs in the plan.
Open-cell foam at the roofline
This suits attics where the air handler and ductwork live, because the foam brings them inside the conditioned part of the house instead of leaving them in the heat. It costs more than loose fill, and in that setup it's usually worth it.
Closed-cell foam for tougher spots
Some spots need foam that also blocks moisture, and that's where closed-cell foam insulation earns its higher price. If any part of your house is one of those spots, I'll tell you.
Air sealing plus loose fill
If no ductwork runs through the attic, sealing the gaps and topping up the blown-in insulation on the attic floor usually does the job for less money. I'd rather tell you that than sell you foam you don't need.
Find out if open-cell foam suits your attic
Send us a few details about your house, and we'll reply within one business day to set up a visit. I come out myself, look over your attic and roof, ask a few questions, and give you a free estimate with no obligation to go ahead.
(843) 416-5007Open-cell foam insulation and permits in Mount Pleasant
The Town of Mount Pleasant requires a building permit for construction projects valued above an amount its Building Official sets, or for any project that needs a structural inspection, and the city says only its Plan Reviewers can decide whether a given project needs one. That means whether your attic foam job needs a permit isn't settled until a Plan Reviewer says so, which is why we check with the city's Building Inspection Division before work starts. Applications go in online through the city's website with supporting information and a site plan, and if your job needs one, we take care of the application and keep you informed.
We're based in Mount Pleasant and work in the cities around it, and many of the lived-in houses we see have the air handler and ductwork up under the roof, with a room or two that never quite cools. That's the setup where open-cell foam makes the most sense, and we find the same layout on jobs in Charleston, North Charleston and Summerville.
What happens after you call about open-cell foam in Mount Pleasant?
Call or send the form
Reach us at (843) 416-5007 or through the form, and we'll set a day for me to come out. If there's ductwork in the attic or a room that won't cool, please mention it, since that shapes what I look for.
I look over the house
I come out myself, look over the attic, the roof deck and what's already up there, and ask a few questions about the house. You get what I found, what I'd suggest and a price for your attic, and if loose fill would serve you better than foam, I'll price that too.
We check permits and prepare
Once you decide to go ahead, we check with the building office for your address, whether that's the Town of Mount Pleasant, another city or the county, and any roof repairs are done before we return. On install day our crew covers your floors and belongings on the way to the attic.
We spray, then walk through
Our install crew sprays the foam and cleans up, and your family stays out for the time the product calls for. Then I walk you through the finished attic so you understand what we did and why.
Frequently asked questions
How much does open-cell spray foam insulation cost in Mount Pleasant?
Spray foam insulation in the Charleston area usually costs about $1 to $5 per square foot installed, and that's the going rate for spray foam in general, not one particular type. Where your job lands depends on how much roof deck we're covering, how deep the foam goes and whether the roof or old insulation needs attention first. The estimate gives you the figure for your own attic.
Does open-cell spray foam block moisture?
No, open-cell foam is vapor open, so it insulates and seals air but can't serve as the layer that controls moisture vapor. Closed-cell foam can do both, which is why a house that needs the foam itself to handle vapor calls for closed-cell. An attic that's sealed and no longer vented also needs a way to remove moisture, so the plan has to keep that space conditioned and dry.
Does my roof need to be repaired before spray foam insulation?
Yes, if it has leaks or damage, because building guidance calls for inspecting the existing roof and repairing those problems before the foam goes on. If your roof is at or near the end of its life, it's worth considering a replacement first so it keeps water out. Foam under a leak can hide the water until the deck is damaged, so I look at the roof during the estimate.
How long does spray foam take to cure before we can go back inside?
Plan on staying out until the foam has cured and the house has been aired out and thoroughly cleaned, which is what archived EPA guidance advises. Some foam makers recommend 24 hours after a professional two-part application before anyone returns, though the time can vary by product. We'll go over the instructions for the foam on your job ahead of time, so you can arrange where the kids and pets will stay.
Does spray foam in the attic need to be covered?
Some spray foams do, with a thermal or ignition barrier such as a coating or gypsum board, depending on the product and the code. Others don't, so the answer comes from the foam maker's instructions for the product on your job. I'll tell you at the estimate whether yours needs one.
What is the best way to deal with old attic insulation before spray foam?
The best way is to look at it first, because old insulation that's been soaked or is full of droppings should come out instead of staying in the house. When the foam goes on the roof deck, the old floor insulation sometimes stays and sometimes goes, depending on its condition. I'll show you what I see up there before we decide.
Mt Pleasant, SC
Have your attic checked before any foam
If you have your attic size, your roof's age and any history of leaks handy when you call, the visit can go straight to the questions that decide your price.