Note: Please reference EFCO's "Understanding Condensation" brochure which can be obtained through your EFCO representative.
Condensation will form on any surface when unfavorable conditions (interior temperature and relative humidity and exterior temperature) are present. When the formation of excessive condensation is a concern, it is highly recommended that a design professional is utilized to perform an analysis of the shop drawings to recommend the best possible installation methods. Please contact your EFCO representative for information on EFCO's Thermal Analysis Services.
Many current installation practices lead to an increase in the possibility of the formation of condensation. Though not all inclusive, the list of examples below illustrates conditions
under which condensation is likely to occur:
Note: Assembly Instructions ( Y807 ) are provided as a supplement, and should be used in conjunction with the approved shop drawings.
EFCO 2012Page 2
EFCO 2012 Page 2
1. Bridging system thermal break with non-thermally broken metal flashing or lintels that are exposed to the exterior
2. System exposure to cold air cavities
3. Interior relative humidity levels not maintained at recommended levels, see EFCO’s “Understanding Condensation” brochure
4. Inadequate separation between system and surrounding condition at perimeter
5. Product combinations during the shop drawing stage that result in bridging thermal breaks
of one or all products involved.
Series 8750XD Unitized Curtain Wall Installation Instructions
Section 1: General Notes And Guidelines
HANDLING / STORING / PROTECTING ALUMINUM
The following guidelines are recommended to ensure early acceptance of your
products and workmanship.
A. HANDLE CAREFULLY - Store with adequate separation between
components so the material will not rub together. Store the material off the
ground. Protect materials against weather elements and other
construction trades.
B. KEEP MATERIAL AWAY FROM WATER, MUD, AND SPRAY - Prevent
cement, plaster, and other materials from contacting with and damaging
the finish. Do not allow moisture to be trapped between the finished
surface and the wrapping material.
C. PROTECT MATERIALS AFTER ERECTION - Wrap or erect screens of
plastic sheeting over material. Cement, plaster, terrazzo, and other
alkaline materials are very harmful to the finish and are to be immediately
removed with soap and water. Under no circumstances should these
materials be allowed to dry or permanent staining may occur.
GENERAL GUIDELINES
The following practices are recommended for all installations:
A. REVIEW CONTRACT DOCUMENTS – Become thoroughly familiar with
the project. Check shop drawings, installation instructions, architectural
drawings and shipping lists. The shop drawings take precedence and
include specific details for the project. Shop drawings govern when
conflicting information exists in the assembly and installation instructions.
Note any field verified notes on the shop drawings prior to installing.
EFCO assembly and installation instructions are general in nature and
cover many conditions.
B. INSTALL ALL FRAMING MATERIAL PLUMB, LEVEL, AND TRUE –
Proper alignment and relationships to benchmarks and column
centerlines, as established by the architectural drawings and the general
contractor, must be maintained.
C. ERECTION SEQUENCE - The sequence of erection should be
coordinated with the project general contractor to prevent delays and
minimize the risk of material damage. Note: When preset anchors are
required, coordinate and supervise anchor and insert placement with the
general contractor including insert layout drawings, where required.
Manufacturing, assembly, glazing, and shipment of the preglazed units
must be carefully coordinated with the general contractor to ensure a
continuous and sustained flow of materials to the appropriate areas of the
project to meet the project schedule.
D. PERIMETER CONDITIONS - Verify that all job site co nditions and
accompanying substrates receiving the installation are in accordance with
the contract documents. If deviations occur, notification must be given in writing to the general contractor and differences resolved before
proceeding further with the installation in the area in question.
E. ISOLATION OF ALUMINUM - Prevent all aluminum from coming in direct
contact with masonry or dissimilar materials by means of an appropriate
primer. Typical slab anchors may be set directly onto concrete surfaces in
a block-out pocket at the edge of the slab. The block-out pocket is later
filled in with grout thereby covering the slab anchor. In such cases, a
heavy coat of zinc chromate or bituminous paint must be pre-applie d to
the slab anchor.
F. SHIPMENT VERIFICATION - Verify contents of all material shipments
received upon their arrival. Verify quantity and correct finishes. Notify
EFCO immediately of any discrepancies or damage that may have
occurred.
G. SEALANT - All sealant must meet [ASTM C 920, CLASS 50]. For the
purposes of these instructions, sealant is to be defined as the following:
SEALANT - A weather resistant, gunnable liquid filler which when cured
provides a resilient, flexible (± 50% movement capability min.) air and
water seal between similar and dissimilar materials.
All sealant must be compatible with all surfaces on which adhesion is
required, including other sealant surfaces. All frame surfaces should be
clean, dry, dust, and frost free. If a primer is required, it must be applied to
clean surfaces. All perimeter substrates shall be clean and properly
treated to receive sealant. All sealants and primers must be applied
according to the sealant manufacturers instructions and
recommendations.
This system is designed and has been tested to utilize silicone sealants at
all internal joineries, i.e., joint plugs, gasket intersections, etc.
EFCO 2012 Page 3
Series 8750XD Unitized Curtain Wall Installation Instructions
Section 1: General Notes And Guidelines
It is the responsibility of the glazing contractor to submit a statement from
the sealant manufacturer indicating that glass and glazing materials have
been tested for compatibility and adhesion with glazing sealants, and
interpreting test results relative to material performance, including
recommendations for primers and substrate preparation required to obtain
adhesion. The chemical compatibility of all glazing materials and framing
sealants with each other and with like materials used in glass fabrication
must be established.
Maintain caulk joints as shown in the approved shop drawings. A 1”
minimum joint is required at the head and jamb condition to accommodate
installation, building movements, and thermal expansion and contraction.
H. STRUCTURAL SEALANT JOINTS - The maximum allowable size of the
glass lite is controlled by the width and depth of the structural silicone joint
combined with the specified design wind load (PSF or Pa). The stress on
the structural silicone must not exceed 20 PSI (137 KPa) for a 6:1 safety
factor.
In order to determine the structural silicone sealant contact width or bite
which adheres the glass to the frame, a calculation must be performed on a
job by job basis. The formula which determines the sealant width is based
on using a trapezoidal load distribution rule. This formula is expressed as
follows:
Structural Sealant = 0.5 x Short Span (ft) x Wind load (lb/ft²)
Bite or Contact Width (in) Sealant Design Strength (=20 lb/in²) x 12 in/ft
Example: Lite size is 4’0” x 5’0” and wind load for the project is 60 psf.
Structural Sealant = 0.5 x 4’ x 60 psf
Bite or Contact Width (in) 20 x 12 240
Sealant manufacturers, as a general rule, specify the structural sealant
depth (glue line) to be one half of the contact width for a 2:1 width to height
ratio. The glue line should not exceed 3/8” thickness nor be less than 1/4”
thick. The standard joint size for Series 8750XD is 1/2” x 1/4”. Note:
Weather seals must be applied a minimum of four hours after the
application of the SSG sealant joint to allow for proper cure time.
or 120 or .500”
SECONDARY SEALANT JOINT DETAIL
I. SECONDARY SEALANT JOINT DESIGN - The design of the secondary
sealant joint is based on the 50:50 load sharing principal where the I.G. unit
is comprised of two symmetrical lites of glass. The secondary sealant joint
that adheres the two lites of glass together only carries half the wind load
applied to the I.G. unit. Since the load is halved, the secondary sealant
contact width is half that of the SSG joint. Using the example earlier for the
1/2” x 1/4” SSG joint, the secondary sealant contact width for the I.G. unit in
the example is 1/4”.
Edge deletion is required on the coated surface (#2 or #3) for hard or soft
coated glazing products.
SECONDARY SEALANT JOINT DETAIL
EFCO 2012 Page 4
Series 8750XD Unitized Curtain Wall Installation Instructions
EXTRUSION IDENTIFICATION
Profile Part # Description Tooling/Cut Length Formula
17T1
17T2
17T3
17T5
17T6
17T7
17T8
3" STANDARD
COVER
STANDARD
HALF COVER
STANDARD
INTERMEDIATE
HORIZONTAL
HEAD OR JAMB
FILLER
HEAD
OR CUSTOM
JAMB
SPLIT MULLION
#1
SPLIT MULLION
#2
Section 2 - Parts Identification
EXTRUSION IDENTIFICATION
Profile Part # Description Tooling/Cut Length Formula
KV32 STATIC SILL END DAM MILL FM56 - 4.188 SHEAR & PUNCH FM56 (1) STC7 (2)
FM52 (1) FM53 (1)
FM48 (1) STB1 (6)
KV34 LEFT HAND 90 DEG OUTSIDE CORNER SLAB ANCHOR MILL FM63 - 16.000 CUT & MILL FM63 (1) FM60 (2)
KV35 HIGH LOAD RIGHT HAND 90 DEG OUTSIDE CORNER SLAB ANCHOR MILL FM67 - 21.000 CUT & MILL FM67 (1) FM60 (3)
KV36 HIGH LOAD LEFT HAND 90 DEG OUTSIDE CORNER SLAB ANCHOR MILL FM68 - 21.000 CUT & MILL FM68 (1) FM60 (3)
KV37 HIGH LOAD MULLION, JAMB OR 90 DEG INSIDE CORNER SLAB ANCHOR MILL FM66 - 21.000 CUT & MILL FM66 (1) FM60 (3)
KV39 STACK SILICONE END DAM SILICONE HC13 - 5.250 HC13 (1) WO7V (4")
KV41 SUB HEAD END DAM MILL FM69 - 8.156 SHEAR & PUNCH FM69 (1) SPZ1 (2)
KV43 DOOR JAMB END CAP PER JOB FM39 - 3.000 SHEAR FM39 (1) WO7V (3")
KV46 RIGHT HAND SLAB HOOK ANCHOR MILL FM06 - 3.000 CUT & MILL FM06 (1) M171 (1)
KV47 LEFT HAND SLAB HOOK ANCHOR MILL FM05 - 3.000 CUT & MILL FM05 (1) M171 (1)
KV48 11" & 13" SUN SHADE ARM MOUNTING BRACKET MILL FM82 - 13.000 CUT & DRILL FM82 (1) S124 (5) S134 (6)
KV49 INSIDE OR OUTSIDE CORNER ALIGNMENT CLIP MILL FM78 - 4.000 CUT & MILL FM78 (1) STC7 (3)
EFCO 2012 Page 11
Series 8750XD Unitized Curtain Wall Installation Instructions
Section 3 - Static Starter Sill Preparation and Installation
Projects will be produced by EFCO in on e of two ways: 1) As a stock length product where all fabrication, assembly, and glazing will be performed by
the customer, or: 2) Prefabricated “kno ck down” where EFCO fabricates the materials, and the customer performs the assembly, and glazing. The
materials shown here in the installatio n instructions may be received in the field with varying degrees of shop assembly, with some items shop installed,
and other items to be field installed. Certain assembly and installation procedures shown and described in this document may be performed in the shop
or the field at the discretion of the assembler.
1. Preparation of the Static Starter Sill:
a. The static starter sill may have an end dam pre-attached and sealed at the jamb condition. Ensure that the end dam is properly applied and sealed
to the starter sill as described below. This is a critical seal and the joint must be carefully tooled to create a watertight seal. See Figures 1, 2, 3 & 4.
b. The starter sill may have LC23 spacer pre-applied. The LC23 is cut to the length of the starter sill. The WEA2 gasket will not be applied at this point,
it will be applied once all sections of the sill are set to avoid having seams or splices. This will be covered later in these instructions.
c. Plug the both ends of the tubular section of the starter sill by recessing backer rod at least 1” into the end of the tube. Fill the voids in the tube and
between the thermal struts with sealant and tool smooth.
Clean all sealant contact surfaces using an approved solvent or cleaner of all oils and other contaminants. The sealant manufacturer’s
preparation and application instructions should be followed exactly. If sealant primer is required, apply it per the primer/sealant
manufacturer’s instructions.
Pocket for
WEA2
LC23
Spacer
FM56 End Dam
Attach with
(2) STC7
STC7
Figure 1
Silicone Sealant
along profile to be
covered by end
dam
Plug with backer
rod and fill the
voids in the tube
and between the
thermal struts
with sealant and
tool sealant
Tool sealant smooth
into joints.
Figure 3 Figure 4
Figure 2
Ensure LC23
Butts into the
end dam
fully.
Back Seal
End Dam to
Starter Sill
EFCO 2012 Page 12
Series 8750XD Unitized Curtain Wall Installation Instructions
Section 3 - Static Starter Sill Preparation and Installation
d. A static loading clip (FM45) is required at each jamb and intermediate vertical. Two are required at corner mullion conditions (FM46 and FM47). The
anchors are used to transfer end load reactions from the verticals into the anchoring syste m . Before installation of the static starter sill, slide the
appropriate number of static loading clips into each section of starter sill. See Figures 5 and 6.
e. Slide the static loading clips into final position before the starter sill anchor bolts have been applied.
Slide static loading clips into
the static starter sill at corners.
(Left hand-FM46, Right handFM47)
Figure 5
Slide FM45 static
loading clips into
the static starter sill.
Plug with backer rod and
fill the voids in the tube
and between the thermal
struts with sealant and
tool sealant smooth.
46° Cut at Corner
Figure 6
EFCO 2012 Page 13
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