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Aluminum Rainscreen
Cladding
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| DESCRIPTION |
Kanalco Aluminum Rainscreen Cladding is an exterior “dry
joint” cladding system which is designed as part of a rain penetration
control assembly commonly referred to as a “rainscreen” wall. The
Kanalco cladding acts as the first line of defense in controlling the impact of
wind driven rain on exterior walls. The second line of defense consists of a
cavity space and the air barrier system behind the cladding.
With the Kanalco
cladding system, the air pressure load is not resisted by the cladding. Instead
the air induced pressure is transmitted through the cladding by way of vented
openings in the metal panels. The panel design allows rapid equalization of the
cavity pressure with the local external pressure so that the entire wind load
is transferred to the insulated air/vapor barrier while preventing wind driven
rain from entering the cavity space.
A rainscreen wall differs from both a face-sealed wall (caulked
joints) and a conventional drained cavity wall in several important respects as
noted in the comparison chart above.
The important aspect in the above
comparison is that in the Kanalco rainscreen approach, the integrity of the
structural elements of the exterior wall are generally not affected (corroded)
by accidental rainwater penetration through the exterior face of the cladding.
This is assuming the second line of defense (cavity space and air barrier) are
properly designed and implemented. The result is a more durable and long
lasting building requiring less maintenance.
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| Basic Use: |
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Exterior cladding (rainscreen system) |
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Industrial, commercial and institutional |
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New construction or renovation |
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| Limitations: |
For non-load bearing (non-structural) use
only.
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Composition and
Materials
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Kanalco Rainscreen Cladding panels are fabricated with welded
corners using solid 3 mm (.125”) aluminum alloy 5005-H34 anodizing quality
or 3003-H14 paint quality tensioned levelled sheet. Other thicknesses or alloys
are available. Materials, coming from the mill in sheet form, are finished to
customer specifications.
Flat metal is brake formed; curved panels are
either brake or roll formed, depending on radius and direction of curve.
Cladding incorporates effective venting area, vent locations, venting
geometry, and stiffness to satisfy required design loads
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| Finishes: |
The following aluminum finishes are offered as standard by
Kanalco:
Anodized finishes: Architectural Class 1, 20 um
(.0007”) or Class 2, 10 um (.0004) in clear or standard colors.
Paint finishes: PPG Duranar fluorocarbon coatings containing
Kynar 500* resin in a wide range of architectural colors.
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| Advantages: |
The Kanalco Aluminum Rainscreen Cladding provides the following
advantages:
Rain penetration control: Controls the four forces
which act to move water inward of the wall i.e. Kinetic energy, capillary
suction, gravity, and air pressure.
Prevents direct entry of
water: Overlap panel design and panel components consist of drips,
capillary breaks, caps, and sills to direct most water away from building
surfaces. Flashing and dam protection are also included within the system to
direct any moisture that may have penetrated the cladding, back to the outside
via joint reveals.
Rapid venting of cavity: Panel design
relieves cladding of normal wind loads, minimizes risk of condensation within
wall, and permits rapid drying of cladding material.
Convenient
panel removal: Non-progressive installation permits individual panel
removal or replacement. Allows access to wall behind at any specific point for
envelope maintenance or inspection of window frames, air seals, insulation, air
barrier and similar items.
Attractive properties: As a
building material, aluminum excels in the areas of formability, light weight,
easy maintenance, attractive appearance, finish integrity, and cost.
Sophisticated design: Metal reinforced panels allow for
pressure equalization within wall, thermal and structural movement, and
positive and negative wind load conditions.
Dry joint, unique
fastening system: Sharp and true joints mate at horizontal and vertical
reveals without the use of sealant. Concealed securement permits rapid
installation and positive panel alignment without unwanted vibration (wind
rattle).
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| Sizes: |
Width - Coil or sheet is available in up to 1524 mm
(60”) width and may be slit to smaller widths.
Length -
As desired, depending on material availability.
Thickness - 3
mm (.125”) is standard. Other thicknesses available.
Radiused
Corners - 6 mm (1/4”) minimum
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| Shapes: |
Brake or roll (roller die) forming can produce an infinite
variety of shapes. Kanalco can advise on proposed design configurations upon
request.
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Applicable
Standards: |
Kanalco aluminum fabrications conform to: CAN/CGSB-93.1M
Aluminum
Association Designation System for Aluminum Finishes (clear or color anodized).
AAMA #605 for
Duranar colored coatings “Voluntary Specification for High Performance
Organic Coatings on Architectural Extrusions and Panels”.
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TECHNICAL
DATA |
Comprehensive data relating to the physical and mechanical
properties of aluminum can be found in AAMA technical literature available upon
request from the Architectural Aluminum Manufacturers Association, Washington,
D.C.
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| INSTALLATION |
Methods: Kanalco Ltd. are a custom
manufacturer specializing in the metal fabrications field. Installation of
Kanalco aluminum products is normally carried out by the appropriate trades and
experienced installers according to specifications and approved shop drawings.
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| Precautions: |
In rainscreen designed walls, optimum performance is achieved
by several elements of the wall working in unison, not with the cladding alone.
Ensure that the three main components of the wall system (air barrier, cavity,
space and rain screen cladding) contain properly designed features in order for
the wall systems to control water penetration.
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| Building Codes: |
Kanalco Aluminum Rainscreen Cladding in a properly designed
rainscreen wall meets the intent of the 1995 NBCC (Separation of Environments,
parts 5.6.1.1 and 5.5.2.1).
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AVAILABILITY
& COSTS
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Kanalco fabricated metal products can be shipped worldwide.
Current cost data is available upon request.
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| WARRANTY |
Normal 1 year construction warranty.
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| MAINTENANCE |
To keep aluminum architectural components attractive, a
definite maintenance program must be followed. The frequency of cleaning will
depend on:
- atmospheric environment and severity of pollution.
-
effect of weathering on the aluminum finish and ability of the finish to shed
dirt and grime.
- cost involved.
- owner’s interest in retaining
the original appearance.
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TECHNICAL
SERVICES |
Kanalco Ltd. can provide consultation from preliminary design
through to product application, including the following:
•
Technical advice for both new work and retrofit applications.
• Finish
samples. • Specification assistance
• Shop drawings.
•
Recommending contractor sources.
• Site advice and
recommendations.
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| RELATED REFERENCES |
NRC/IRC (National Research Council/ Institute for Research in
Construction) publication “Exterior walls: Understand-ing the
problem” by G.O. Handegord, K.N. Burn, R.L. Quirouette et al (rain screen
principle), 1983.
CSC (Construction Specifications Canada) Tek Aid
Digest, 07195 Air Barriers, March 1990.
NRC/IRC publication
“Building En-velope Performance and Durability” (undated).
AAMA technical literature available from the Architectural Aluminum
Manufac-turers Association, Washington, D.C.
Duranar technical
literature and color chart data available from PPG Canada Inc., Mississauga,
Ontario. For other areas, contact PPG International Sales, Pittsburg, P.A.
Additional Kanalco Ltd. technical literature:
- REYNOBOND®
Composite Panels
- Stainless Steel Wall Panels - Aluminum Wall Panels
-
Metal Column Covers
- Specialty Sheet Metal Fabrication
- Insulated
Panels
- Formed Metal Profiles
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| SPECIFICATION |
SPEC NOTE: This specification is basic and must be adapted to
suit the requirements of individual projects. It is written in accordance with
the CSC/CSI 3-Part Section Format. Square brackets [ ] indicate choice,
alternatives, data required or need for the specifier to make a decision.
1) GENERAL
1.1 GENERAL REQUIREMENTS
- .1 Comply with General Conditions of Contract,
Supplementary Conditions and the [ ] requirements
of Division 1
1.2 RELATED SECTIONS
- .1 Structural steel supports, Section [05100]
- .2 Cold formed metal framing, Section [05400]
- .3 Air/Vapor barrier Section, [07270]
- .4 Roof and Fascia Flashing, Section [07500]
- .5 Sealing between metal and [concrete] [masonry],
Section [07900]
- .6 Metal doors and frames, Section [08100]
- .7 Windows, Section [08500]
1.3 DESIGN REQUIREMENTS
Spec Note: For 1.3.1 insert expected temperature range for
locality of building including range for locality of building including
allowance for skin temperature heat gain in sunlight on coloured
finish.
- .1 Design cladding system to provide for thermal
movement of component materials caused by ambient temperature range of [____ C
( F)] without causing buckling, wind rattle, undue stress on fasteners or other
detrimental effects.
- .2 Include expansion joints to accomodate movement in
wall system and between wall system and building structure movements, without
permanent distortion.
- .3 Design members to withstand dead load and wind
loads as calculated in accordance with NBC and applicable municipal
regulations, to maximum allowable deflection of 1/180 of span.
- .4 Provide for positive drainage of condensation
occuring within wall construction and water entering at joints, to exterior
face of wall in accordance with [NRC "Rain Screen Principals"].
- .5 Design wall system to accomodate specified
erection tolerences of structure.
- .6 Maintain following installation tolerences:
- .1 Maximum variation from plane or location shown on
approved shop drawings: [10 mm/m xx(3/8" per
300'-0")] maximum.
- .2 Maximum offset from true alignment between two
adjacent members abutting end to end, in line: 0.75mm (1/32").
1.4 SHOP DRAWINGS
- .1 Submit shop drawings in accordance with Section
[01340].
- .2 Indicate dimensions, wall openings, head, jamb,
sill and mullion detail, materials and finish, anchor details, compliance with
design criteria and requirements of related work.
1.5 SAMPLES
- .1 Submit duplicate [_____] x [_____] mm (in.)
samples of wall system, representative of materials, finishes and colours, in
accordance with Section [01340] for approval.
1.6 QUALITY ASSURANCE
- .1 Qualification of Installer
- Installation of cladding system to be made by work
forces approved by cladding manufacturer.
1.7 MOCK-UPS
- .1 Provide mock-up on building consisting of complete
cladding system, including but not limited to metal furring, panels, securement
devices, and moldings for approval. Cladding finish and moldings to be of
finish and colour as designated by the [Consultant] [Architect].
- .2 Location of mock-up to be as directed by
[Consultant] [Architect]. Size to be four panels mimimum in a 2 over 2
configuration.
- .3 Modify mock-up as necessary for [Architect's]
[Consultant's] approval. Mock-up [may] [may not] remain in place as part of
completed work. Mock-up to represent standard for completed work.
1.8 STORAGE AND PROTECTION
- .1 Handle, store and protect materials in accordance
with cladding manufacturer's written instructions.
1.9 MAINTENANCE DATA
- .1 Provide maintenance data for care and/or panel
replacement for incorporation into operation and maintenance manual specified
in Section [01730].
2) PRODUCTS
SPEC NOTE: If more than one type panel, thickness, size, or
colour is required, specify type, etc. and ensure drawings or specifications
indicate location of each type.
2.1 MATERIALS
- .1 Metal building panels: Kanalco Aluminum
Rainscreen cladding, performed, custom fabricated aluminum to CAN/CGSB 93.1M,
3mm (.125") thick, [5005-H34] [3003-H14] alloy, [915 mm x 915 mm (3'-0") panel
size, as manufactured by Kanalco Ltd.
- .2 Panel finish: architectural [Class 1, 20 um
(.0007")] [Class 2, 10 um (.0004)] [clear] [_____color] anodized finish or PPG
Duranar flurocarbon coating containing Kynar 500 resin finish [_____color] as
selected.
- .3 Trim and coping: 3 mm (.125") aluminum, to
match cladding system.
- .4 Sub-girts: 1.2 mm(18 ga.) zinc coated
steel, to ASTM A525 with Grade A coating to ASTM Z275.
- .5 Flashing: base, window head, metal closure,
and similar flashings to be 1.5 mm (.062") thick aluminum, finish to match
cladding system.
- .6 Fasteners: self tapping s.s. screws to CSA
B35.3-1962, purpose made.
- .7 Sealents: in accordance with Section
[07900], paragraph [_____], [_____type] [_____] color as selected
by [Consultant] [Architect].
- .8 Isolation coating: [alkali resistant]
[bituminous paint] [epoxy resin solution].
- .9 Support angles, brackets, etc.: hot dipped
galvanizing with zinc coating [600 g/m2] [3.4 mils] to CSA G164-M1981 or ASTM
A123-84.
2.2 FABRICATION
- .1 Panels to factory fabricated, with [welded]
[non-welded] corners, in accordance with specifications and approved shop
drawings.
- .2 Maximum allowable fabrication tolerences to
be:
- .1 Panel bow: 0.2% of panel dimensions up to 4.7 mm
(0.187") maximum.
- .2 Width or length: + 0.80 mm (0.032") up to 1220 mm
(48") + 1.5 mm (0.064") from 1220 xxmm to 3360 mm
(48" to 144").
- .3 Squreness: Maximum 4.7 mm (0.187") difference
between diagonal measurements.
- .3 Form all panels to specified dimensions with
tolerences to accomodate thermal expansion and contraction between panels and
structural members. Accurately form radii of curved panels in plant.
- .4 Factory fabricate accessory and trim components,
ready for installation.
3) EXECUTION
3.1 INSPECTION
- .1 Prior to installation examine alignment of
substrate and notify [Consultant] [Architect] in writing if substrate does not
comply with manufacturer's recommendations.
3.2 INSTALLATION
- .1 Install cladding in accordance with manufacturer's
written instructions and shop drawings. Allow for thermal movement.
- .2 Maintain following installation tolerances:
- .1 Maximum variation from plane or location shown on
shop drawings: 10 mm/10 m ((3/8" in 30'-0") of length and up to 20 mm/100 m
(3/4" in 300'-0") maximum.
- .2 Maximum deviation for vertical member: 3 mm
(1/8") in a 8.5 m (25'-0") run.
- .3 Maximum deviation for horizontal member: 3 mm
(1/8") in a 8.5 m (25'-0") run.
- .4 Maximum offset from true alignment between two
adjacent members abutting end to end, in line: 0.75 mm (1/32").
- .3 Brake form metal flashing to profile required,
in maximum lengths.
- .4 Protect surface of metals in contact with
concrete, mortar, plaster or other cementitious surface with isolation coating.
- .5 Install head and sill flashings, edge trim,
cap pieces and other metal profiles as applicable and/or detailed.
- .6 Obtain panel symmetry whenever possible
relative to openings in both vertical and horizontal place.
- .7 Employ [control] [expansion] joints as
indicated.
- .8 Remove excess sealant using recommended
solvent.
3.3 CLEANING
- .1 As work progresses, remove any excess or
foreign materials which would set up or become difficult to remove from
finished surfaces.
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