Petrarch Reconstituted Stone Rainscreen System - Rainscreen cladding system

Petrarch is an engineered stone cladding system, created primarily from natural by-product materials such as stone and marble. A bespoke binder and woven glass fibre reinforcement result in a panel with high strength and an A2-s1,d0 reaction to fire rating (EN 13501-1).

Highly durable and impact resistant, it is considerably lighter than natural stone and cement based systems. This man-made alternative to stone cladding is highly weather resistant, yet just like natural stone, Petrarch engineered stone rainscreen panels mature over time, giving character and depth to any architectural scheme.

Petrarch reconstituted stone rainscreen panels are manufactured in the UK where the product has been supplied to the rainscreen industry for 50 years and to this day remains the natural choice when specifying rainscreen cladding which balances competing and exacting specification criteria.

Features and benefits of Petrarch reconstituted stone panels:

• Available in 1500 colours and four finishes
• Colours and textures emulate natural stone
• Colour matching service
• Installation by mechanical secret fix, site adhesive and face fixing
• Durable surface, easy to clean and maintain
• Graffiti and impact resistant
• ISO 9001 and 14001 accredited
• Proven performance and life expectancy in excess of 30 years
• BBA approved for added peace of mind
• Fully CWCT tested
• Made in Britain
• Worldwide distribution network

Unique Surface Characteristics

An aesthetic as unique and appealing as natural stone. Thanks to Petrarch rainscreen panels' unique manufacturing process, the surface takes on an open texture, which can be seen on the face of the panel post pressing, whilst in production the surface pattern emulates distinctive marble effects - creating completely random patterns meaning that there will be areas with a higher or lower density of each marble colour.

These nuances enhance its ‘natural stone’ aesthetic and does not affect its integrity. Matt or honed finishes are achieved by removing the surface layer of Petrarch rainscreen cladding panels; exposing the core texture for a distinctive stone- like look.

Petrarch Engineered Stone Cladding Core & Surface

As Petrarch is manufactured with a homogeneous reinforcement the product will not delaminate and is immune to both insect and vermin attack. Additionally a pressure moulded manufacturing process creates a high-density panel which is unaffected by freeze-thaw degradation due to a surface which is virtually non-porous with a water absorption ratio of less than 0.2% after a 24h immersion. Petrarch reconstituted stone cladding panels are hereby ideal for the UK construction market thanks to these excellent weather resistant qualities.

Petrarch rainscreen panels in application

Rainscreen panel applications:

A non-loadbearing external wall assembly comprising two layers.

A protective outer skin of rainscreen cladding panels and an insulated and airtight backing wall both separated by a ventilated cavity.

1. Load bearing support (SFS, concrete, masonry or timber studs)
2. Weather barrier
3. Support system
4. Insulation (refer to section 4.7)
5. Ventilated cavity - Airflow
6. Cladding panel

Types

Closed jointed - back ventilated and drained system

Ventilation is achieved by openings at top and base of the rainscreen cladding. Moisture build-up at rear of panels will be either drained at the base or thermally evaporated.

Open jointed - Pressure equalised system

When the outside air pressure is transferred to the

air cavity behind the cladding panel, the cladding

is exposed to a near-zero pressure differential thus avoiding wind driven rain getting into the cavity through the open joints. A compartmented air cavity is required.

Where can Petrarch engineered stone rainscreen cladding be used?

• Rejuvenation of the façade
• New-build and refurbishment projects
• Low or high-rise applications
• Petrarch should be celebrated at low levels thanks to its highly durable qualities

Design Highlights

• Use different colours & textures
• Design flexibility
• Make a bold design statement or Petrarch can blend with the environment as a rainscreen material designed to look and feel like a natural construction material created by 80% by-product otherwise waste material - crushed marble and stone
• Consistent high-quality finish

Technical Advantages of Petrarch engineered stone rainscreen cladding

• Main building structure protection

• Lightweight materials

• Reduction of applied loads

• Durable and low maintenance finish

• Thermal & Condensation control

• Reduced installation times

• Fabrication offsite

• Reduction of on-site waste

• Accurate cost estimation

Worldwide and multiple sector applications

Petrarch has been designed and installed as a rainscreen cladding system with open and closed joints in many developments throughout the UK, Europe and the US.

The air gap from face of insulation to rear of Petrarch reconstituted stone panels must be a minimum of:

• 25mm - visible fixed system to aluminium vertical rails.
• 50mm - visible fixed system to timber battens and mechanical secret fixed system
• Or that advised by local or national building regulations
• Subframe cladding profiles must always be laid vertically to allow for a continuous vertical airflow and panels installed with a minimum joint width of 10mm.
• Structural movement and/or deflection joints must be absorbed by the support framing and cannot be transferred to the rainscreen cladding panels.

Environmental promise

At Architectural Panel Solutions (APS) we are committed to our environmental promise and are ISO 14001:2015 certified.

As a company we are conscious of our environmental responsibility and recognise the potential environmental impact of our processes and products. This extends to the manufacturing of our Petrarch reconstituted stone rainscreen panels.

At all times we adhere to the latest environmental legislations and standards. Additionally, we endeavour to maximise positive effects on the environment.

In all our activities we aim to:

• Promote the use of environmentally friendly processes and materials.
• Use only sustainable, natural resources where possible. 80% of the materials used to manufacture Petrarch rainscreen panels is derived from otherwise waste material.
• Achieve continuing improvements in environmental performance, over and above regulatory and legislative requirements.
• Raise the awareness of environmental issues within our business.
• Where possible satisfy local needs using local resources.
• Develop and promote environmentally friendly products, processes and architectural solutions.
• Every effort is taken to minimise the amount of waste created during production. Off-cut Petrarch panels are transformed into samples and packaging wherever possible.

Physical Properties of Petrarch reconstituted stone panels

Reaction to fire classification:

Petrarch A2 A2-s1, d0 Petrarch B-s2, d0

EN13501-1:2007+A1:2009

Façade fire performance

PASS

NFPA 285 (US)

BS8414, assessed by BRE 135 (UK)

Large Scale test as part of a standard assembly Petrarch B-s2,d0

Flexural Strength

>25MPa

EN14617-2:2016

Freeze-Thaw

No significant loss in performance

EN14617-5:2012

Modulus of elasticity

>11,000 MPa

Water Absorption

0.2% by weight

24hour total immersion

Impact Resistance

Category B

10mm - Soft & Hard Body

Class 1 / Negligible Risk

7mm -

Soft Body - Class 1 / Moderate Risk

Hard Body - Class 1 / Negligible Risk

CWCT TN76

Wind Load Resistance

2.4 kN/m2 - Serviceability 3.6 kN/m2 - Safety

CWCT Standard Test Methods for Building Envelopes 2005

Cyclic Loading

2.4 kN/m2 - Serviceability

CWCT, based on BRE Digest 346, Part 7, which is compatible with BS 6399

Fatigue test representing typical UK service loads in 50-year exposure period

Linear coefficient of thermal expansion

22x10-6 / oC

BS 1902-Section 5.3:1990

Density

2240 kg/m3