Hycrete, Inc.

Owner:

Architect:

General Contractor:

Scope Of Work

Prince William Hospital in Haymarket, VA is completing a $100,000,000 expansion, designed

by Gresham Smith & Partners, and built by Brasfield & Gorrie, Inc., a leading contractor of

hospitals in the US.

Challenge

The elevated slabs are lightweight concrete composite metal decks and the slab-on-grade

is traditional concrete over a vapor retarder on compacted base. These two applications

posed a very high risk on fast-track construction projects in the past, and would often

dictate change orders for topical barrier systems that can run two to three times the cost

of the Hycrete Integral approach.

Solution

The construction team selected Hycrete V1000 to protect the flooring on five floors of the

hospital, including the slab-on-grade of the first floor, from moisture vapor issues.

Result

Hycrete reduced the vapor emissions in the lightweight composite slabs, which used an

expanded shale that retains moisture for years after slab placement. The importance of

Hycrete’s reduction of vapor emissions in the elevated decks is magnified because the

use of non-vented metal pans does not allow for any downward drying of the slabs.

Brasfield & Gorrie insisted on the Hycrete Integral approach on this project, not wanting

to chance moisture vapor transmission problems in sensitive hospital facilities. The risks of

floor failures and the consequential shut down of critical hospital services were deemed

too important to be exposed to unacceptable risk. The concrete is at an acceptable moisture

vapor emission rate (MVER), enabling the flooring to be installed properly and on time.