EIFS, Exterior Insulation and Finish Systems, are
appropriate for nearly any location if the proper drainage measures are
designed and executed. In low-drying or high-humidity locations, ones with
substantial annual rainfall, moisture must be prevented from entering at joint
locations. And water should also be allowed to drain via an designed cavity
that prevents penetration into the interior gypsum and other insulating
materials.
By limiting temperature
transfer from the outside, EIFS construction layers are engineered to act as a
blanket to lower energy costs substantially. However, when that blanket becomes
wet and will not dry in a short ime, problems begin to arise. The issues can be
in the form of mold development and deterioration of the material components.
Drainage and Seals
Two separate measures are
employed to combat moisture and reduce the potential for water and high
humidity damage to EIFS layers. These measures should be properly executed
during the initial construction or remodel.
Drainage Plane- Creating a drainage cavity or gap between the
outer EIFS surface and the interior glass-matted gypsum allows moisture that
penetrates through the stucco-like
surface to drain
downward and out through the base of the wall. This drainable EIFS assembly
process eliminates most of the moisture retention problems that plagued earlier
versions of EIFS.
Sealant Joints- The other major culprit to accumulating
moisture in EIFS construction are the joints that surround windows, balconies,
and doors. Also, rain may flow through the roof joints into the EIFS lamina if
these are not properly sealed. In areas where drying periods are longer or rain
is less frequent, the materials my dry out within a reasonable time. But in
rainy areas, these potential problem spots can allow moisture to enter without
proper sealing.
To ensure a perfect sealing
process in every potential trouble spot, Building Science recommends that the
sealant must:
● Adhere well to the lamina
● Be ultraviolet light resistant
● Not be stronger than the base coat bond strength
●
Be affordable
If joint sealants are applied
perfectly, the building owner should not experience problems. Regular
inspection to determine whether the sealants are holding should identify
problems that may be developing.
Sealants can be reapplied
when necessary to prevent further damage.
EIFS installation must be
performed perfectly to be fully effective. In high precipitation and excessive
humidity, moisture can develop anywhere.
If you have questions
regarding the practicality and economy of EIFS in future construction and
remodeling, be sure to seek expert advice. The cladding professionals at ProCoat
Systems in Denver are available to
discuss the technical aspects of EIFS construction for your building.
This post was originally
published at http://www.procoatsystems.com/face-sealed-eifs-sealant-joints/