03 54 13 Gypsum Cement Underlayment

03 54 13 Gypsum Cement Underlayment

Specification Details




8.5" x 11"


Word Doc

Usage Limit

Unlimited Projects


03 54 13

Provided by

Get Instant access

This specification is available for purchase in the following bundles:

Gypsum Cement Underlayment

Use this CSI 3 part SimpleSpecs™ master specification to specify poured-in-place, self-leveling gypsum cement underlayment.


Gypsum-based floor underlayments are self-leveling products used for filling and leveling floors.  They must be placed over a concrete or plywood structural floor; they do not provide structure on their own. They are not suitable for exterior use and must be covered with finished flooring.


Underlayments may be used in conjunction with radiant floor heating systems and sound mat or sound board for improved STC and IIC ratings.


Gypsum concrete is lightweight.  A 1.5-inch slab of gypsum concrete weighs 13 pounds per square foot versus 18 pounds per square foot for regular concrete.  Even though gypsum concrete weighs less, it still has the same compressive strength as regular concrete, based on its application as underlayment or top coat flooring.


Gypsum is fire-resistant and the assemblies are UL listed.


Check with the underlayment manufacturer to select a product to meet your project requirements.


To learn more about gypsum concrete, visit Wikipedia.


Related Section:

03 54 16 – Hydraulic Cement Underlayment 



gypsum cement underlayment



The SimpleSpecs™ master specs concept
Adding More Words Does Not Make Specifications More Enforceable.    
Design professionals are accustomed to seeing lengthy project specifications, so why is SimpleSpecs™ so short?
Specifications have grown evermore wordy over the years for several reasons:
  1. The mistaken belief that specifications must be lengthy and legal-sounding to be enforceable.  In fact, quite the opposite is true.  Having shorter, easily understood specifications makes us less likely to have problems in the field.
  2. A belief that having lots of words protects us from a Contactor making mistakes.  There is no way to include enough statements to protect yourself from a bad contractor, regardless of the length of your specification.
  3. Our desire to be in control of the project by specifying means and methods instead of including simple, enforceable statements.
Easier to Edit

SimpleSpecs™ is written as a series of Microsoft word files that include statements that affect construction costs or overall quality and are far simpler to edit than other master specification systems.


Each SimpleSpecs™ specification section is non-proprietary and includes three manufacturers that meet the specified reference standards, descriptive, or performance-based requirements. They are written to allow any listed manufacturers to provide the specified products.

Hidden Guide Text

Each SimpleSpecs™ specification section includes hidden text to inform and guide users in editing the specifications to suit project conditions.

Streamlined Editing

SimpleSpecs™ sections are edited using pre-defined options that are contained in [brackets] or by selecting optional text separated by "OR" statements. Paragraph and page numbering are included as automatic codes, eliminating the need to renumber when revisions are made manually.  Global changes to headers, footer, terms, font colors and phrases are easily updated using a third-party search and replace software, available through ZeroDocs.com.


Industry Resources