Technical Document of C.A.T 3 Ventilated Façade System

Technical Dep. Wandegar Wandegar_2001_S.L.U__-_P.I_Mabesa_Camí_Foies_Ferraes_Nave_13._

Phone_ +34 964_363_721__Fax_ +34 964_386_720__CP:_12110__L'Alcora_(Castellón)_

INTRODUCTION

The façade is the outdoor and main wall of a building, isolating the

perimeter of outdoor environment. The main characteristic of ventilated

façades is the air chamber, divided by two parts, the indoor one resolved by

the insulation and sealing, and the outdoor one, which form an air chamber,

ensuring a continuous ventilation along the whole façade surface. It permits

isolate the cold in winter and warm in summer, achieving energetic saves

up to 30%. Outdoor cladding walls could be of many kind of materials such

ceramic, natural stone, composites, etc. Rediwa CAT 3 system is a visible

anchoring that supports and retains the ceramic by its corners. Furthermore,

the system is complemented by the fixing longitudinal of an elastic-

chemical adhesive of ceramic to the vertical profiles, increasing the safety

and avoiding any vibration because of wind, expansion, etc.

USING TERMS

Rediwa CAT 3 System has been developed to be installed such ventilated

cladding wall with ceramic tiles, point-fixed with stainless steel clamps and

longitudinal beads of adhesive to the metallic structure. This system does

not contribute to building stability.

Wandegar or any other specialized company approved by us should install

the system, being possible the technical assistance of Wandegar. We

reserve the inspection right of checking any installation of the system

described in this document, whether or not executed by Wandegar.

The installer company will ensure that installation will be executed

according to conditions exposed in this document and tolerating the

observations made by the Technical Department of Wandegar.

TECHNICAL DOCUMENT OF VENTILATED FAÇADE SYSTEM

This Technical Document has been created by the Technical Department of

Wandegar following the specifications in the actual normative. The system

metallic substructure and its anchorages on the wall (vertical profiles and

brackets) are exactly the same than the ones described in DIT 529/09 that

issue the Eduardo Torroja Sciences Construction Institute, so Wandegar

extends this structure description to this document.

1. OBJECT

The named system Rediwa CAT 3 developed to install ventilated façade in

new building or restoration, composed by ceramic tiles fixed to the

aluminium framework with chemical and mechanical anchors.

The framework is based in vertical profiles, fixations and its corresponding

anchors. They were developed to be installed on regular and vertical walls.

These walls can be done of concrete, bricks or metallic structure.

Anyway, anchors should be defined in the ventilated façade technical

project depending the support and loadings to transmit.

2. DESCRIPTION OF THE SYSTEM

The Rediwa CAT 3 system is composed by:

- Vertical aluminium profiles anchored to wall support with brackets

and the necessaries anchors. These profiles will be coincident with

the vertical joints.

- Stainless steel clips AISI 304

- Single component elastic putty, based on polymer MS.

Fig. 1: Detail of Rediwa CAT 3 system

3. COMPONENTS AND MATERIALS

3.1 Coverings

This system has been developed to use it with ceramic coverings.

Wandegar is not a ceramic producer, so we do not guarantee its quality.

3.2 Elastic adhesive putty.

Monocomponent elastic adhesive putty, based on polymer MS of fast

drying with moisture in air.

Properties:

- Single component, easy application between +5 and +50 ºC

- It adheres without primmer

- Neutral. It doesn’t corrode metals neither alkaline substrates attacks.

- It stays flexible from -40 to +90ºC

- Very high resistance to UV.

- Good adherence on wet surfaces.

Characteristics of non-dried adhesive

Aspect Homogeneous creamy paste

Take off (NF P 85501): Null

Tack free (ASTM C-679-71) 10-15 minutes

Dry speed to A23ºC and 55% air

moisture

2-3 mm/day

Volume losses (DIN 52451) Inappreciable

Skin formation (BS 5889 Ap A) 20-40 minutes

Ignition temperature (DIN 51794) 460 ºC

Application temperature +5 to +50ºC

Characteristics of dried adhesive (4 weeks to 23ºC and 55% air moisture)

Aspect Similar to rubber

Shore Hardness A (DIN 53505) 40±3

Elastic Module 100% (DIN 53504) 0.8-1.1 MPa

Traction Resistance (DIN 53504) 1.8-2.4 MPa

Breaking Elongation (DIN 53504) 350-450 %

Joint Movement 25%

Temperature Resistance -40 to +90ºC

UV Resistance Very good

3.3 Clips

The anchoring clips are made in stainless steel AISI 304. The visible clips

are lacquered to same colour than ceramic. These clamps are fixed to

vertical framework with auto drilling screws A2 4.5x19mm coincident with

vertical opened joints, so installation and replacement is very easy.

Fig. 2 CAT 3 System Visible clip

Mechanical Properties:

Creep Resistance 310 MPa (45 KSI)

Maximum Resistance 620 MPa (90KSI)

Elongation 30% (in 50mm)

Area Reduction 40%

Modulus of Elasticity 200 Gpa (29000 KSI)

Physics Properties:

Density 7.8 g/cm3 (0.28 lb/in3)

Chemical Properties:

0.08% C min

2.00 % Mn

1.00 % Si

18.0 – 20.0 % Cr

8.0 – 10.5 % Ni

0.045 % P

0.03 % S

3.4 Substructure

3.4.1 Materials

The vertical profiles and brackets are manufactured with extruded

aluminium of magnesium-silicon alloy EN-AW 6063 with treatment T5.

Phisical and mechanical characteristics are indicated on this table:

Density (kg/dm3) 2.7

Modulus of Elasticity (MPa) 69500

Poisson Coefficient 0.33

Maximum tension admissible (MPa) (4) ≥ 175

Elastic Limit Rp 0.2 (MPa) (4) ≥ 130

Elongation 8

Thermal Expansion Coefficient (k-1) (20

to 100ºC)

23’6 . 10-6

3.5.2 BRACKETS

There exist two types:

- Sustaining brackets, which support and transmit to the concrete

structure weight and wind burdens. They’re usually fixed to slabs.

- Retaining brackets, which they just transmit the horizontal wind

burdens. They’re fixed to wall support.

All these brackets are 3mm thickness.

You can check the geometric characteristics of the brackets in the

following table:

Characteristics Length sides 70x50 Length sides 90x60

Weight (kg/m) 0.8 1.15

Area (mm2) 351 441

Perimeter (mm) 240 300

Turning radius Xc (mm) 22.68 29.37

Turning radius Yc (mm) 14.99 17.86

Moment of Inertia Ixx (cm4) 18.05 38.04

Moment of Inertia Iyy (cm4) 7.88 14.07

Standard Bracket 70x50x115

Standard Corner Bracket 70x180x80

3.5.3 Vertical Profile

There exist four different standard vertical profiles. Physical and

mechanical characteristics are indicated on this table. Measurements are

indicated on fig. 3. Dimensional and shape tolerances are agree with Norm

UNE EN 755-9. To special applications, these profiles could be another

one non-standardized according to the needs.

Tube profile 40x40 Column Vertical Profile 80x40

T Vertical Profile 60 x 80 Column Vertical Profile 80x64

3.5.4 Fasteners

The fasteners to join profiles together and also to the brackets are

manufactured with stainless steel on A2 or A4 alloy with the measurements

and mechanical properties according to this table.

3.5.5 Anchorages to support

Type, position and number of anchorages of the brackets to the wall

support will depend according to the support material and the efforts

transmitted to it, being reflected on the previous ventilated façade project.

The standard anchorages to the slabs are the mechanical plugs A2 M8x75

with these main characteristics:

- Traction Resistance: 561 kg

- Shear loading: 513 kg

4. INSTALLATION

4.1 VERTICAL PROFILES INSTALLATION

This structure is installed on the support with the brackets and

necessary anchorages.

The vertical profiles will be installed coincident with the vertical joints.

4.2 PORCELAIN INSTALLATION

To install the porcelain, you have to fix to the vertical profile an initial

clamp with the auto-drilling screw 4.2x19 on the bottom side of the

porcelain. Then, you have to apply a vertical putty string on the vertical

profile, and then, when you install the porcelain, this putty will also join the

porcelain to the profile. This putty provides a higher safety and avoids

porcelain movements. Then non-leaving the porcelain, insert the standard

clamp on the top grooves and screw to the vertical profile. Then, you can

continue fixing all the horizontal line with porcelain using the initial

clamps and following the process. It’s advisable to start from the bottom to

the top.

Apply the putty string

Nails of the Visible Clamp

5. TESTS IN OUTSIDE LABORATORIES

6. STRUCTURAL CALCULATION

The action on the ventilated façade system will be calculated according to

CTE DBSE-AE related to actions on edification.

For the system calculation, it will be considered that porcelain should

support wind loadings (pressure and suction) and transmit them, with its

own weight and through the structure and anchorages to the support.

To buildings up to 30m high and to limitations according to CTE-DB-SE-

AE related to wind action, these will be determined according to

established in that Basic Document (DB), that talks about the building high,

size and position of the porcelain.

For greater heights, or special wind loading areas, it will be necessary to

make a specific study to determine the wind actions and Aeolian

pressure/suction coefficients.