Frequently Asked Questions
Q: What is extremegreen™?
A: extremegreen™ is a high-density structural magnesium oxide cement board designed to replace plywood, OSB, fiber-cement board and interior and exterior gypsum based sheet building products.
Q: What is extremegreen™ made from?
A: extremegreen™ is made from Magnesium Oxide (MgO).
Q: What is Magnesium Oxide?
A: Magnesium Oxide (MgO), is a naturally occurring inorganic mineral that is mined from the earth much like Portland cement.
Q: Is extremegreen™ structural?
Yes, extremegreen™ can be used in place of plywood, OSB, fire-treated plywood, fire-treated OSB, exterior gypsum board and interior gypsum board.
Q: Can extremegreen™ be used externally?
A: Yes, extremegreen™ can be used internally or externally
Q: Where is extremegreen™ most commonly used?
A: extremegreen™ is most commonly used as exterior sheathing, interior wallboard, subflooring, ceilings, roof decking, fire-resistant wall and subfloor assemblies, tile backerboard, siding and trim.
Q: What sizes is extremegreen™ available in?
A: extremegreen™ is available in 3’ x 5’, 4’ x 8’, 4’ x 9’ and 4’ x 10’.
Q: What thicknesses is extremegreen™ available in?
A: extremegreen™ is available in 1/4”, 1/2”, 5/8” and 3/4″.
Q: Is extremegreen™ sheathing expensive and how much does it cost?
A: extremegreen™ is a high-performance building material, so sheet for sheet it is more expensive than traditional gypsum board, but it is fire, water, mold and insect resistant.
extremegreen™ is a far stronger, high impact product and requires fewer layers than gypsum, fire treated plywood or OSB in fire-rated assemblies, thus saving money in material in labor. Significant savings are also achievable when it comes to finishing. Typically, 50% less joint compound and paint is used to achieve a Level 5 finish.
Q: extremegreen™ flooring expensive and how much does it cost?
A: extremegreen™ flooring outperforms most other floor sheathing products on the market and can save 40% – 50% when compared to poured concrete. It also eliminates the need for lightweight gypsum use in mid-rise, high-rise and multi-family construction projects.
Q: How do you install extremegreen™?
A: extremegreen™ is installed in a similar fashion to gypsum board, plywood, or OSB.
Q: Can you nail extremegreen™?
A: extremegreen™ can be nailed or screwed.
Q: Does extremegreen™ feed mold?
A: extremegreen™ does not rot, mold or feed mildew and has a 0/0/0 mold rating.
Q: Is extremegreen™ flammable?
A: No, extremegreen™ is non-combustible and is Class A fire rated, with a 0 flame spread and 0 smoke developed rating. No other plywood, OSB or gypsum based product can claim this.
Q: Is extremegreen™ heavy?
A: No, a ½” sheet of extremegreen™ weighs approximately the same as 5/8” gypsum board – +/- 2.4 pounds per sq. ft.
Q: Is extremegreen™ people safe?
A: Yes. extremegreen™ is completely non-toxic. It is manufactured from 100% natural inputs and does not off-gas. It is exceptionally good for Asthma or chemically sensitive people.
Q: Is extremegreen™ contractor friendly?
A: Yes, and the dust generated when cut with a circular saw is non-carcinogenic. extremegreen™ does not contain known toxins such as formaldehyde, crystalline silica or fly ash.
Q: How do you cut extremegreen™?
A: extremegreen™ can be scored and snapped like gypsum board, or you can use a circular saw.
Q: Is extremegreen™ an approved building material?
A: Yes, extremegreen™ is a listed and certified building product and complies with the 2009, 2012 and 2015 International Building Code and International Residential Code.
Q: How do you finish extremegreen™?
A: extremegreen™ is taped, mudded and painted in a similar fashion to gypsum board.
Q: Can you achieve a Level 5 finish with extremegreen™?
A: Yes, a Level 5 finish can be achieved with one coat of extremegreen™ Primer and one coat of top coat.
Q: Is extremegreen™ termite proof?
A: Yes, extremegreen™ is completely resistant to all wood boring insects.
Q: Is extremegreen™ waterproof?
A: extremegreen™ is impervious to water, both fresh and salt. Being cementatious, it does however absorb some water.
Q: What happens when extreme green™gets wet?
A: Nothing. It dries out and is unaffected.
Q: Is extremegreen™ dimensionally stable when wet?
A: Yes, very.
Q: When should extremegreen™ be used?
A: extremegreen™ should be used wherever there is a need for a fireproof, mold proof, insect proof, waterproof and high impact alternative to gypsum board, plywood, OSB or fiber cement board.
Q: What kind of screws do I need to fasten extremegreen™?
A: We recommend powder coated, yellow zinc or stainless steel #10 screws for fastening into steel framing or a #12 screws for fastening into wood framing.
Raised nibs under the head of the screw help countersink the screw beneath the surface of the board and deliver a superior finish. We do not recommend traditional bugle-head gypsum screws.
Q: Is pre-drilling necessary?
A: No, not with the recommended screws.
Q: Do I need blocking to hang pictures when using extremegreen™?
A: No. You can hang practically anything off extremegreen™ with no additional blocking needed. (See Data Sheet for maximum capacities).