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Frequently Asked Questions About Gypsum Page 2

In this section you have emailed us your questions & we posted & answered them here.
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Thank You, David Melnick, Poured Floors of NY & NJ
Question 3: What is the minimum thickness of Gypsum Underlayment that can be installed over the following types of subfloors, Radiant Tubing, Acoustical Mat, Plywood, Concrete or over the top of Marino/Ware and Dietrich Steel Decking?
Answer 3: I will answer this question with a short explaination. Floor Deflection has a large impact on the depth that is required at a minimum. However the standard rule of thumb applies in 95% of case's.

Radiant Tubing - Minimum amount above the tubes is 3/4"
Acoustical Board LEVELROCK SRB - Requires 3/4" topping
LEVELROCK SRM-25 Sound Mat - Requires 1" of topping

Marino / Ware and Dietrich Corregated steel decking - Requires 1" above the high point
3/4" T & G Plywood Subfloor require 3/4" minimum of topping
Concrete Slab or Precast Concrete - Requires to maintain a minimum of 3/8" but may be featheredge at the high point or door ways.
Question 4: Should I use LEVELROCK RH Radiant for my radiant heat system or a Mud Job Installation?
Answer 4: I will give you the facts so you come to your own conclusion.
1. Thermal Mass - Both Gypsum Underlayment & a Mud Job have high thermal mass however because LEVELROCK is mixed in a wet form it doesn't have the air voids that are found in Mud Jobs thus resulting in better transfer of heat.
2. Reinforcement - LEVELROCK RH Radiant does not require reinforcement unless a moisture barrier has been applied that impedes bond. Mud Jobs always require a moisture barrier and wire reinforcement because they are mashed into place and have not enough water to make a bond to it self let alone to the subfloor.
3. Installation - Because the materials are mixed and pumped in, LEVELROCK RH Radiant type products will use less man power and a fraction of the time to install. Mud Job Requires mixing Portland and sand together with little water then since it is not pumpable it must be man handled to the area that is to be installed thus shutting down your project for extended periods of time instead of the single day typical of LEVELROCK Installs.

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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.