1. What is stucco, and what is it made of?
Stucco is a
commonly used exterior cladding for single
and multifamily homes, townhouses and
condominiums, as well as smaller commercial
buildings. It is a mix of sand, Portland
cement powder, lime, water, and in most
cases, pigment. Stucco forms a protective
outer layer that shields the building from
harmful climatic conditions.
2.
How long does stucco last?
While it is difficult to
quantify the average lifespan of a stucco
home, we can say that stucco is as durable
as any commonly used exterior cladding
material. Stucco is low maintenance, weather
resistant, non-combustible, and it performs
well in a variety of climatic conditions.
3.
What are some of the advantages and
disadvantages of stucco relative to other
economical cladding options?
Stucco is durable, low maintenance, weather
resistant, insect proof, impact and noise
resistant, and it performs well in a variety
of climatic conditions. Stucco also provides
up to one-hour fire resistance, a feature
that sets it apart from other economical
cladding materials, and it is the only
exterior cladding that studies have shown
will improve a building’s ability to
withstand an earthquake. If stucco has a
disadvantage, it is that on the front end it
can be more time consuming to install. But
over the long-term, stucco provides far
greater value than comparable economic
cladding materials.
4.
What
role did stucco play in British Columbia’s
Leaky Condo Crisis? In its final report, the
Barrett Commission determined that BC’s
Crisis was the result of a total system
failure, and it identified several key
contributors, not the least of which were
imprudent building design and a reliance on
uncertified and inexperienced contractors.
In fact, intersections involving windows,
doors and decks were identified as the most
frequent locations for water ingress. Stucco
installed by a certified contractor is
specifically designed to prevent the type of
leakage and building rot that typified the
Leaky Condo Crisis. For a building envelope
to be effective in wet weather, it must be
able to breath, allowing water that does
permeate the surface to escape through
specifically designed drainage channels, one
of the principle features of a traditional
stucco system. Stucco performs well in all
weather and climatic conditions. It is, in
fact, hydraulic cement, which means it
hardens or cures with each successive
exposure to water.
5.
Is
stucco suitable for a wet climate like that
found on the West Coast? Yes. Professionally
installed stucco is durable, low maintenance
and weather resistant. It performs well in a
variety of climatic conditions, readily
adapting to wet/dry and hot/cold cycles.
It is less likely to have rot
with the new National, and British Columbia
Building Code, 10 millimeter Rain Screen
System if done by Certified/Professional
applicators.
6.
What
colours does stucco come in? Recent
developments in pigmentation technology have
added considerable selection to stucco’s
traditional colour palate. In 2004, IMASCO
introduced 21 rich new colours with its
Artisan line. In all, stucco is available in
over 103 colours. And because stucco is
pigmented cement, it will never fade or
require painting.
7.
Can you
paint over stucco? You can paint stucco,
provided you use a paint that is compatible
with your existing stucco finish. FogCoat, a
sand-cement based paint, is recommended for
all sand-cement stucco finishes. Fog coating
will dramatically improve the look of an
existing stucco exterior without affecting
its ability to breath (transmit moisture
vapour). It is possible to use other types
of paint, such as breathable paint, e.g:
General paint-latex breeze. However, they
won’t last as long as a sand-cement based
paint. Acrylic coatings will also negatively
affect the permeability of the stucco, and
potentially inhibit the release of moisture.
8.
Does a
contractor need to be certified to apply
stucco? To achieve the maximum benefit from
a stucco exterior, we always recommend using
a certified contractor. In 2000, IMASCO
established a comprehensive contractor
certification program to promote consistent,
quality installation of stucco products.
IMASCO regularly circulates a list of its
certified contractors to architects,
engineers and developers.
9.
What are EIFS? External Insulating Finishing Systems
(EIFS) is a variation of the traditional
stucco system. It combines stucco cladding
with a polystyrene insulating foam. EIFS has
been in use throughout North America for
over 25 years on a wide variety of buildings
and architectural designs.
10.
What is the difference between regular
sand-cement stucco and acrylic stucco? There
are two principle types of stucco finish,
sand-cement and acrylic. Both incorporate
the same traditional sand-cement basecoat,
but the latter contains a flexible
acrylic-based top layer. Acrylic stucco is
more time consuming to apply, but is
considered to be more water-resistant.
Acrylic has a limited range of texture and
comes in almost any colour imaginable.
Cement stucco has an unlimited variety of
textures but is limited in colour.
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