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Revolution Optimizing metal rooﬁng and wall systems
with advancing technology
by David A. Brown, PE
Photo © Fabral
THE CUSTODIAN AT ASHEBORO
CHURCH OF GOD (NORTH CAROLINA)
HAD A WELL-WORN ROUTINE DURING
SUMMER MONTHS. EVERY SATURDAY,
HE WOULD TURN ON THE CHURCH’S AIR-
CONDITIONING (AC) AT 3 P.M. TO ENSURE
THE SPACE WAS COOL AND COMFORTABLE
FOR MORNING SERVICE THE NEXT DAY.
THE 1115-M 2 (12,000-SF) BUILDING NEEDED
AN 18-HOUR COOL-DOWN TIME.
In a time where sensitivity to environmental
impacts is growing and utility bills are rising, this
is unacceptable. Buildings demand reliable, high-
thermal performance envelope solutions that:
• drive energy-efﬁciency;
• prevent heat loss;
• eliminate thermal bridging; and
• control solar gain over its operating lifetime.
These performance criteria are key factors in
minimizing energy running costs and reducing
carbon emissions, while maximizing property
value and lease-out opportunity.
When evaluating a solution for the Asheboro
church’s re-rooﬁng application, the construction
team was faced with these performance objectives.
In June 2011, after investigating new innovations
in sustainable technology, the team opted for
phase-change materials (PCMs).
A ‘roof hugger’ technique—a sub-purlin system
that ﬁts on existing metal panels, supports new
panels, and can be conﬁgured to add insulation—
was used for metal-over-metal re-rooﬁng. The
new panels were seamlessly integrated with sheets
of a plant-based compound that absorbs heat
60 the construction speciﬁer | april 2013
3/14/13 11:49:37 AM