Closed Cell Foam – The Only Insulation For Your Raised Floor

Insulating A Raised Floor

Here in New Orleans, and across Louisiana and the Gulf South, we love our raised houses. Building raised houses were born of necessity, as a way to protect our homes in the event of flooding from heavy rain or hurricanes.

From Houston, Texas, all the way to the southern tip of Florida, Gulf Coast land sees little if any significant elevation rise to help protect us from rising floodwaters. And, our climate is primarily hot, humid, and rainy the majority of the year.

These geographical and climate factors pose a unique challenge when it comes to building raised homes.

Historically, most raised houses had no insulation. On top of the floor joists was maybe a single layer of subfloor, then flooring on top of that. Prior to the widespread use of air conditioning, this would be acceptable when folks used whole house fans and ceiling fans to try and keep their homes cooler by exhausting the hot air from the house, not cooling the air inside of the house.

Past Mistakes Insulating Raised Floors

With the widespread use of air conditioning, owners of raised homes [just like owners of traditional homes] wanted to find ways to insulate their homes to help keep their cooling bills low and their homes more comfortable. This led to homeowners trying just about anything that was on the market at the time to insulate their raised floors and try to control moisture.

Homeowners tried installing fiberglass batt and Rockwool insulation, spreading plastic sheeting over the ground to try and help reduce moisture, and closing in the raised area all in the hope of better home performance and greater comfort.

Unfortunately, when installed in an exterior application, fiberglass batts and Rockwool slab insulations tend to break down fairly quickly. This would drastically reduce their insulating performance, and lead to other issues, like the build-up of moisture on the bottom of the subfloor causing warping of wood floors and mold growth.

Fiberglass batts and Rockwool insulation also have the unfortunate tendency to absorb and hold onto water in the event of flooding or extreme moisture build-up. This would present an extremely messy removal and clean up, and expensive replacement installation of even more fiberglass or Rockwool.

Many homeowners simply chose to live with an uninsulated raised floor, because the drawbacks of insulating with traditional products simply weren’t worth it. But, that was then, and this is now.

Closed cell [aka two-pound] foam is a rigid material that commonly delivers an R-Value of about 5.1 – 6 per installed inch. Closed cell foam, when installed at a depth of 2 inches, provides an effective air, vapor, and water barrier in addition to its exceptional insulation performance.

Closed cell foam is typically installed where very high R-Values are required, and it is the only insulation product recommended for installation under a raised home. Closed-cell foam can also be installed in combination with open-cell foam and even blown-in insulation products.

Closed Cell Spray Foam Insulation

With the invention of spray polyurethane foam insulation, the tables have turned for owners of raised homes. There is now an insulation product that can be installed under the floor of a raised home that offers high R-Value, air sealing, and moisture control, all in a single application – closed cell spray polyurethane foam.

In the residential insulation market, there are two kinds of spray foam insulation – open cell and closed cell, but only closed cell foam is acceptable for insulating raised floors.

Open-cell foam, as the name notes, is an open-cell structure foam. It is an awesome product for insulating inside walls or in your attic, but it should not be installed anywhere that it is exposed to the outside elements, as its makeup is porous in nature.

Closed-cell foam, as the name notes, is a closed-cell structure foam. This means that it is not porous in nature. When properly installed, 2+ inches of closed cell spray foam insulation provides a 100% vapor and moisture barrier, delivers a high R-Value, and will help make your home more quiet and comfortable throughout.

For homeowners of a raised house, properly insulating their raised floor is an energy efficiency improvement that pays off big through lowered cooling and heating costs, improved indoor air quality, and increased overall comfort.

Wrapping It Up

If you own a raised home, or are planning on building a raised home, making the right decision about how to insulate your raised floor is one that can pay off for decades to come. If you plan to insulate your raised floor, then closed-cell spray foam insulation is the only product you should consider. 

Here at Diversified Energy, we provide home insulation solutions. We offer multiple insulation products, so we can design insulation & home performance packages for renovations and new construction that fit both your energy efficiency goals and your budget.

Item of note – Installing spray foam insulation is not something just anyone can do correctly or effectively. Installing spray foam insulation is an art form unto itself. With the rise in popularity of spray foam insulation, virtually anyone willing to invest in the equipment thinks they can install spray foam insulation. Here at Diversified, we are constantly called upon to fix the substandard spray foam insulation jobs by the “discount” spray foam companies in the gulf south, because we employ the most experienced spray foam installers in the region.

For more information about Spray Foam Insulation, and overall home performance,  contact us today – 504-273-7779 – [email protected].

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Romell SmithRomell Smith
17:31 16 Apr 24
They came in and did an awesome job. All smiles, made sure the work was being done effectively, explained everything and gave me a couple pointers.... My CFM50 Reduction was almost 2000. A massive drop in inefficiency. They even cleaned up everything behind themselvesread more
Missy BarardMissy Barard
02:09 04 Apr 24
I am highly recommending diversified energy to everyone that is looking for a dependable company with very knowledgeable, hard-working, kind... responsible, neat workers that take the time and finish Your home with a fine tooth comb. The praise goes to Niki and Alli/Natristan This company couldn’t have sent me two better workers I appreciate everything that you have done. I’ve already referred you to a coworker and she’ll be looking forward to working with you all as well. Niki and Alli You all are a five star duel. Best wishes in your career. The work and the communication that you all has given, Sure makes a customers life at ease. Your Boss should give ya’ll a raise for making the company standards and values stronger . Thanks again for more
Anthony AlmericoAnthony Almerico
20:19 21 Mar 24
Nikki and her crew did an excellent job attending to my home energy needs. From the beginning, Nikki was very communicative letting me know exactly... what time the crew would arrive. They were very attentive to details, and made sure to keep me informed of everything that was going on throughout their work. They were even so kind as to let me know I had a roof leak, 😔, and notified me of it's location. They were mindful of my home and made sure not to disturb anything and even offered to help vacuum the house when they were done! They were also very aware, and kind, to my pup while going in and out the house, as he likes to dart around. Nikki made sure my gate and front door were always closed! (For those that have pets home while workers are present know how important this is.) I have had quite a few groups of people work on my home over the years and I can tell when someone cares about their work and when someone doesn't. Nikki and her team really cared, and I felt like I got to know them during the time they were working on my home. What a great job! It was a wonderful, EASY experience to work with them!read more
Blake CulpepperBlake Culpepper
18:50 09 Jan 24
Jeff and his team were very informative and helped me to understand the way my AC and insulation were contributing to moisture issues I was having.... Through an educational approach, we addressed the most pressing issues and will re-evaluate progress over time. We added spray foam over a previous spray foam job that was inadequately done, corrected damaged duct work under my house with insulation, and replaced an oversized AC unit, all of which were contributing to excess moisture and wasted energy costs in my home.Jeff and team were also very friendly and professional, which was refreshing when I was being oversold and pressured by another company. I would certainly recommend Diversified Air to friends and more
14:31 04 Nov 23
Diversified Energy did a great job at my home for weatherization. The crew was extremely professional and curious. I would highly recommend this... more
Gary ClementsGary Clements
17:05 07 Oct 23
Diversified Energy, from its owner, Jeff Haag, to its team led by Nikki, were thorough, competent, professional, hard-working and cost-effective. We... had our attic ductwork sealed and then the entire attic floor insulated with blown-in cellulose fiber, covered completely by sheets of the cutting edge technology of QV Platinum PCM (Phase Change Material) [Diversified Energy is the sole provider of this technology in the metro area]. Our A/C system works less now, even with continuing heat. We recommend Diversified Energy for upgrading your home’s energy efficiency!!read more
Jason RiggsJason Riggs
11:26 05 Oct 23
Jeff Haag and Diversified Energy went above and beyond while consulting with my client about insulation and home efficiency. He is very... knowledgeable and has insulated multiple homes for me, always with good results. Very responsive more
Gena McKenzieGena McKenzie
14:06 13 Sep 23
sandy andrepontsandy andrepont
16:04 31 May 23
Nikki and her team did a wonderful in my home. They sprayed insulation, sealed air ducts and attic and much more. Nikki explained everything that was... being done, very professional and respectful of me and my home. I highly recommend them!read more
Rudy LinhubRudy Linhub
15:20 15 May 23
When only the best customer service and installation will do. They foam insulated my attic and installed an American Standard heat pump. Quick, easy... and in budget. A rare business find.Thanks Jeff!read more
Jenna DuplechienJenna Duplechien
21:38 11 May 23
Niki Aguillard and her crew came out to my house and did a fantastic job! They texted me what time they would arrive and they were on time. They made... sure every crack was sealed in my house and even put door sliders on the doors to keep the air from flowing in. They completely insulated the attic. They were very friendly and kind overall did an amazing job I’m very pleased with how they went over and beyond to ease every concern I had and I really appreciate their hard work. Would definitely recommend Diversified Energy “Plug into Comfort”read more
Joel HenschenJoel Henschen
22:57 13 Mar 23
We had a great experience working with Diversified Energy. They were always willing to communicate and take care of any issue that popped up. One... of the best and most honest contractors I have dealt with. I will definitely use them again in the future. Thank you!read more
Dolores FryouxDolores Fryoux
21:37 28 Oct 22
Niki and Damon did a great job today!! They really answered All my questions and concerns. I am very happy with the whole process and highly... recommend this more
Avis JamesAvis James
18:27 13 Oct 22
Nikki and her crew sealed in the attic, around doors and around plumbing pipes. Then they returned to add insulation. Very professional. Great job.
Rebecca WhitakerRebecca Whitaker
00:08 25 Sep 22
Blake came out and did an energy audit of my place of residence. He was very gracious and professional. He respected my request for him to remove his... shoes and was patient enough to answer my questions. Thank you, Blake!read more
Darrin ClarkDarrin Clark
18:10 27 Jul 22
Niki crew came and explained the job details and performed very professional and in a timely manner and I was satisfied with the whole process and... would recommend to anyone that is in need of the services they provideread more
Dave ODave O
15:55 16 Oct 21
First off these are some friendly and professional people! They came in to our home and had nothing but respect and explained things in a way that... was more family/friend based than technical. BIG shout out to Mike and Ryan for the amazing help and work! They tested the house and did all the checks as well as made sure we had stuff in place. They hooked us up with a great light package that should help our energy use as well as lighting needs. Everything is top notch and amazing customer service!read more
Summer CarterSummer Carter
20:31 18 Mar 19
I had such a great experience with Jack, Shamone, and Chad! They were extremely friendly and very professional! Jack explained what would take place... the morning of my appointment and answered all of my questions! They were all very understanding of my very noisy three year old as well! Thank you again you guys for such a pleasurable experience!read more

Diversified Energy is fully insured and licensed - State Licensing Board for Contractors - License number: 885628

Diversified Energy Is A Proud Member Of The Greater New Orleans Home Builders Association
Diversified Energy Is A BPI Certified Contractor
Diversified Energy Is A Proud Member Of The Spray Polyurethane Foam Alliance
Diversified Energy Is Proud To Be An Energy Star Partner