Commercial Architecture June 2019 - 32

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PROJECT

| exteriors

dents were protected," Sanders said.

The dimensional stability of the product, when

R-Guard FastFlash on the seams and fasteners.

DensDeck Prime can be used as a cover board and

used as a cover board, eliminates gapping, making

Integrating three products into one-gypsum

thermal roof board. Since the district chose to install a

them easier to install. Jake Peavler, project manager for

sheathing, a water-resistive barrier, and an air barrier-

temporary roof on the building during the construc-

Absher Construction, commented, "It's one less thing

the system uses AquaKor technology to create the

tion process, the first layer was used as a base for a

we have to take into consideration for our installers

WRB-AB (water-resistant board-air barrier) within by

self-adhered waterproof underlayment. "It was helpful

and one less thing they have to worry about. That

integrating the fiberglass mat and gypsum core to

that the contractor was able to use the first layer for the

saves time."

form a monolithic, hydrophobic surface that blocks

permanent roof rather than having to install an addi-

Running a close second to noise abatement on the

tional cover board for the temporary roof," Sanders

list of items to address with the wall and roof assem-

noted. "Since they were dealing with wet weather, it

bly: weather resistance.

allowed them to dry-in the temporary roof more
quickly, which helped save the schedule."

bulk water but allows vapor passage, eliminating the
need for a separate WRB-AB.
In recent third-party testing by RDH Building Sci-

Seattle's reputation as having ever-changing weath-

ences, with offices in Seattle and other U.S. and Cana-

er is well deserved. While mostly temperate (highs in

dian locations, DensElement barrier system is report-

The roof board features EONIC technology, a pat-

winter in the 40s, lows in the 30s; summer highs in the

ed to have demonstrated matched performance with

ented process said to double its resistance to moisture,

70s and lows in the 50s), according to some sources it

that of a fluid-applied WRB-AB when it came to

enabling it to meet a three-part specification for mois-

does rain 50% of the time. In the winter, when the

fastener sealability.

ture resistance. Elements of that specification include

temperatures dip below freezing, this equates to snow

"We had internal quality control with the help of

a 5% total water-absorption resistance by weight and

and ice-items that can create havoc with the building

the building consultant, so it was an easier process just

1-gram surface-water absorption performance on both

envelope.

having to seal the seams and fasteners rather than cov-

sides of the board. Also notable is the board's mat-to-

When it came to the walls, the goal was to choose a

core bond strength which, in third-party testing, aver-

product with a lower drying time and easy installation.

Once the building envelope was specified, another

aged 23% stronger on the face and 192% stronger on

The answer was GP's DensElement barrier system.

product popped to the surface and caught the eye of

the back when compared to DensDeck Prime roof

Said to have a lower drying time than other

Sanders: GP's DensShield tile backer. The busiest

boards before the enhancement, according to the

options (such as fluid-applied products), the contrac-

floors in the new elementary school won't be those of

manufacturer.

tor would save time by simply applying Prosoco

the cafeteria or even the classrooms-it's the restrooms.

ering every square foot of sheathing," Peavler stated.

The backer board, with a built-in moisture barrier,
was the perfect choice. The acrylic coating surrounding the product provides a built-in moisture barrier
that stops moisture at the surface, needed in a room
likely to be covered in water on a daily basis.
The combination of roof board and wall system
will create barriers against the weather and air-traffic
noise. At the groundbreaking for the new facility, Des
Moines Elementary School principal Rick Wilson
commented, "We are looking forward to a grand
opening when we can welcome students, staff, and
families to a modern school building that will serve
this community for generations to come." CA

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Sources listed below are linked
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CIRCLE 212

* Absher Construction, absherco.com
* RDH Building Sciences, rdh.com

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Commercial Architecture June 2019

Table of Contents for the Digital Edition of Commercial Architecture June 2019