Patterson Whittaker manufactures a wide variety of architectural profiles for both interior and exterior building applications. PW products generally consist of a layer, or layers, of specialty surface top-coatings applied over reinforced, expanded polystyrene (EPS) cellular foam cores. PW products are used in both residential and commercial applications.

PW exterior-grade profiles can be safely applied to weatherproof and code-compliant wall systems such as stucco, brick, concrete, CMU block and other smooth and impermeable substrates. PW also offers materials suitable for attachment to most conventional interior wall and ceiling surfaces, as well as unique assembly and attachment systems that can provide significant installation cost savings over other common building detailing systems.

PW products are very stable, high quality, decorative glue-on materials that do not require penetration of the waterproof membrane for secure attachment and are not intended for use as component of the primary envelope system. PW’s lightweight composition also helps protect architects, contractors and installers from liability issues commonly associated with settling, structural loading or seismic episodes.

Patterson Whittaker architectural profiles are manufactured to strict quality standards.

PW shapes are RADCO Approved to Federal Manufactured Housing Construction and Safety Standards.


PW Acrylic/Cementitious Base Coat

Base-coated products generally consist of a co-polymer and cement mixture embedded in an open-weave, treated, fiberglass reinforcement mesh.

PW Finish Coatings

Surface coatings vary for each specific PW product offering.

Expanded Polystyrene (EPS) Foam

Unlike Styrofoam, a trademark Dow Chemical product, EPS products are molded cellular blocks, 100% recyclable, and free of ozone depleting CFC’s and HCFC’s.

EPS is a completely inert, non-toxic, recyclable material.



Weatherometer test (xenon arc – UV)

Impact Resistance

Water Absorption


Flame Spread

Smoke Index


ASTM G 155/G26

1kg, 52.5 mm steel ball dropped from 1.0m


AC-11 Section 4.2

CAN/ULC S102-03

CAN/ULC S102-03


No changes in product appearance after 2500 hour test exposure.

No cracks or perforations. No chipping.

2.16%- 7.28% absorption with 24 hour submersion.

No visible change after 25 cycles over 90 days

Classification: 60, after exposure without sealed perimeters.

Smoke developed: 365 without sealed perimeters.

EPS conforming to CAN/CGSB-51 GP20M Type I, ASTM C578-87, ASTM C-050-85, UL 790, UL 723:

Thermal Conductivity ASTM C-177 “K” Factor 0.26 maximum @ 40F
0.28 maximum @ 75F
Average Density ASTM D-1622 1.0 lb/ cu ft. average
Compressive Strength ASTM D-1621 10psi @ 10% offset
Coefficient of Expansion ASTM D- 696 3.5 x 10-5 in./in./F
Water Vapor Transmission ASTM E- 96 1.6 perm- inch minimum
Oxygen Index ASTM D- 2863 24.0 minimum

National Standard of Canada Testing CAN/ULC S701-97:

Thermal Resistance C177 or C518 Type I – 3.75 minimum
(R value @ 75F) Type 2 – 4.04 minimum
Compressive Strength D 1621 Type I – 10 minimum
Type 2 – 16 minimum
Flexural strength C 203 Type 1 –  25 psi minimum
Type 2 – 35 psi minimum
Water Absorption D 2842 Type  I  – 5.2 maximum
(% by volume) Type 2  – 3.5 maximum
Dimensional Stability D 2126 Type 1  – 1.5% maximum
(% linear change) Type 2  – 1.5% maximum

Please call Patterson Whittaker for further or updated information.

©2024 Patterson Whittaker Architectural Profiles by E11World Multimedia Design & Development

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