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Gypcrete 2000 Data Sheet
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Frequently Asked Questions About Gypsum Concrete Page 1
In this section you have emailed us your questions & we posted & answered them here.
We will not use contact info so please use our Price Quote form to ask your questions.
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Thank You, David Melnick, Poured Floors of Ny & NJ


Question 1: Why does Gypsum weight less then Portland based Concrete?

Answer 1: The main reason why Gypsum is so light is due to the Gypsum product pounds per cubic feet. Gypsum is mainly packaged in 79.4 pound bags. Each one of these bags holds 1.23 cu. ft. of Gypsum. This means that per volume Gypsum in powder form no sand or water added eguals on average 61.5 pounds per cu. ft. and Portland Cement in powder form weights 94.5 pounds per cubic foot which makes it about 2/3's the weight of Portland cement. Then we blend our sand which weights around 100 pounds per cu. ft. and water by volume which weights around 62 pounds per cu. ft. Please keep in mind that sand naturally has voids in it that water and cement will fill and sand also absorbs water which also makes it heavier then it's base weight of 100 pounds. Ultimately the result of this mixing of Gypsum, Sand and Water results in a volume of 2.5 cu feet per mix which when still wet weights 118 pounds per cu. ft. However since the Gypsum does not remain in wet stage long, by the time your ready to install your finished flooring the much of the water used to mix your Gypsum has evaporated in the air leaving you with around 96 pounds per cu. ft. Now if you compare this weight to Portland based concrete with sand and stone which weights on average 140 pounds per cu. ft. depending on Hydration, you will see that Gypsum Underlayment weights 2/3's of what Portland Mixed Concrete does.
1.5" of Gypsum weights 14 pounds Wet and 12 Pounds Dry per sq. ft.


Question 2: How much weight will be added to my Radiant Heat Floor after you pour LEVELROCK RH Radiant Gypsum Underlayment over my Radiant Tubes?

Answer 1: When we first pour the LEVELROCK RH Radiant Heat Floor Leveling Underlayment over your floor at 1.5" average depth which will provide the minimum of 3/4" coverage over the top of your tubes it will weight around 14 pounds per square foot. However after you ventilate and dry the floor sufficiently to receive flooring the weight to due to evaporation will be closer to 12 pounds per sq. ft.

Licensed
USG/LEVELROCK
Gypsum Self Leveling Applicator

Contact: Dave@poured-floors.com or Phone: (631) 484-0900 Fax: (631) 517-9191

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A Gypsum New York Sales Corp Company

Applied Surface Materials, Inc.