Dome Homes


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Does the interior wall board support the growth of mold and mildew?

I have allergies.  Does your product promote allergic reactions?

Does the insulation you use support the growth of mold and mildew?

Is there a web site that recommends building materials for sensitive individuals?


Q: Does the interior wall board you use support the growth of mold and mildew?
The 1/4" Dens-Deck that we use showed no mold or mildew growth when tested per ASTM D 3273.  The wall board we use is Georgia Pacific ¼” Dens-Deck Roof Board adhered to the E.P.S. insulation with a nonsolvent latex adhesive.  The Dens-Deck employs fiberglass mat facing instead of paper on both sides of the board.  The core is silicon treated gypsum providing excellent moisture resistance,  fire resistance and adhesion properties.  It doesn’t provide fuel for an accidental fire.  It isn’t even damaged by multiple immersions in water.  It won’t harbor spores that create sick homes.

One square inch of this adhesive will support 10 pounds.  A square foot (144 square inches) of the board weighs less than 2 pounds.  In other words there is much more holding power than needed to keep the wall board adhered to the E.P.S. insulation. 

The glass mats embedded into the core on both faces, results in dimensional stability and prevents warping.  The glass mat is encapsulated with a coating which reduces skin irritation from exposed glass fibers.  The moisture-resistant inorganic core has superior mold, mildew and fire resistance.   The 1/4" Dens-Dec showed no mold or mildew growth when tested per ASTM D 3273.

The Dens-Deck Board which is a roofing board was used on The New Orleans Sports Arena in New Orleans Louisiana.  The following info was taken from Georgia Pacific’s ¼” Dens-Deck roof board data sheets:

Dens-Deck roof board features an inorganic glass mat embedded into a water-resistant treated gypsum core.  The combination of glass mat surfacing and a treated core renders Dens-Deck roof board more resistant to delamination from water than paper-faced gypsum products.  Comparative testing has demonstrated Dens-Deck roof board’s supremacy over such alternatives as perlite and fiberboard. Its engineered features make Dens-Deck roof board the obvious substrate for roofing membranes.  Resists delamination, deterioration and warping, puncturing and other job site damage and resists rot.

Fire Protection:  Because of its noncombustible core and surface, Dens-Deck roof board offers greater fire protection than other conventional products.  Dens-Deck roof board, when tested to ASTM E 84, has achieved a rating of 0 flame spread and 0 smoke developed.  Noncombustible when tested in accordance with ASTN E 136.

Properties of Dens-Deck: Noncombustible, Water Resistance, Dimensional Stability, Decay Resistance, Resistant to Warping, Rodent and Fungus Resistance, Torch Safe, High Compressive Strength.

Fire Classification:  UL Class A, ULC S-102; UL 1256, ULC S-126; UL 790; ULC S-107.

Flame Spread/Smoke Developed: per ASTM E 84 - 0

R-Value: as tested in accordance with ASTM C 518 (heat flow meter)-.28

Surface Water Absorption, grams:  per ASTM C 473- 2.5

Mold & Mildew Resistance: per ASTM D 3273- No growth

The wallboard finishing includes applying joint compound and tape on the seams and painting the wall board.  To blend the seams, mix some vermiculite into your paint.

You can purchase the building kit without the interior wall board. If you do not purchase the optional interior wall board, on site you can trowell either plaster or stucco directly to the E.P.S. 

Q: I have allergies.  Does your product promote allergic reactions?
We have had a individuals contact us who are allergic to chemicals, etc.  Feel free to us at 321-639-8777 with your questions or click on Contact Us and email your questions. One of our clients has had to live in a stainless steel trailer due to reactions to conventional building materials.  She investigated our dome and is now building two small domes for her permanent residence. 

The best way to see if you would be allergic to our shell materials is to purchase a small sample of a panel.  Then ask someone to place the sample in a brown paper bag and without you knowing when, have them put it under your bed.  Let them remove it at a later date and put back an empty paper bag and see if you have any reaction at any time during the test period.

The E.P.S. insulation we use was expanded with steam, no chemicals.  The quality of your indoor air will be determined by your flooring, upholstery, cabinet composition, etc. 

American Ingenuity has been manufacturing dome housing kits since 1976, we have not ever heard of any of our domes having “sick building syndrome” due the following:  1) Dome Homes always have doors and windows.  Double paned windows are only an R-4 so air moves back and forth through the glass and or the windows are opened to let in fresh air; 2) Dome owners have central air conditioners, furnaces or dehumidifiers that serve the purpose of removing the moisture within the dome;  3) Up north where it is cold, air exchangers are used; 4) To exhaust the moisture out of the top of the dome, either an exhaust fan is installed in an interior wall near the peak of the dome or a cupola window or a second floor window is opened.

Q: Does the insulation you use support the growth of mold and mildew?
 Based upon a FHA test, E.P.S. will not support bacterial growth or fungus growth.  It also contains no food value to any living organism.  Its lack of food value means that although termites, ants and rodents will tunnel through it, there is no other attraction. The following is other information taken from the Expanded Bead Polystyrene (E.P.S.) data sheets. 

·         OUTGAS:  The EPS is made from expandable polystyrene beads.  These spherical beads contain a blowing agent such as pentane, which causes the beads to expand up to 40 times their original volume in the presence of steam.  After the expansion and long before the panels are shipped, virtually the entire blowing agent has escaped.

·         DEGRADING INSULATION VALUE:  Our rigid foam insulation does not compress, absorb moisture, deteriorate or degrade like fiberglass & many other forms of insulation.

·         Water Absorption:  The EPS is closed cell and will not absorb more than 2.5% of water based on volume.  It is often used as flotation for docks because it will not absorb water.  Insulation materials that absorb water have a significant loss of performance because water is a good conductor of heat.  This is particularly true with fibrous materials, which must be positively protected by an efficient vapor barrier.  There are two ways in which, moisture can effect insulation materials: water absorption from contact with damp surfaces or from condensation of water vapor.  EPS is a closed cell material that has minimal water absorption and low water vapor transmission.

·         BREATHABILITY:  The amount that a material will breathe or the amount of water vapor that will pass through the material is measured in "Perms" or sometimes "Perm inches".  EPS will breathe enough to allow moisture trapped inside of it to dry out but at the same time it is tight enough to also serve as a good vapor barrier.

·         In our dome the inside of the foam is covered with either plaster or wallboard. Neither of these will interfere with the drying process but they will offer protection from fire.  If the foam gets hot enough it will burn.

·         EPS foam will dissolve in gasoline or similar solvents

·         EPS does not become brittle at sub-zero temperatures.


·         Ingestion: May act as an obstruction if swallowed

·         Inhalation: Minor respirator irritation possible from dust particles

·         Skin Contact: No hazard is known

·         Eye Contact: Minor eye irritation possible from dust particles

·         Carcinogenicity:    NTP:  No      IARC: No       OSHA:  No

·         Symptoms of Overexposure:  Respiratory irritation may occur from dust particles

·         Medical Conditions Aggravated by Exposure: None known.

Q: Is there a web site that recommends building materials for sensitive individuals?
Yes, we have learned of a site called Healthy Home Designs.  It has a listing of “Recommended Healthy Building Resources.” Their web site is www.healthyhomedesigns.com  The following info came from the healthy home designs web site:

The benefits are homes that are safer, quieter, more comfortable, and require less maintenance. A healthy home is also more energy efficient, and therefore incurs lower monthly operating costs