Detached house with gable roof, roof and façade are covered with PREFALZ from PREFA in P.10 anthracite. The panels of the roof surface extend across the façade. Part of the façade is clad with weathered wood.

Roof system Prefalz

Versatile and supple: PREFALZ is easy to work with and thus offers great creative scope for your roofing.

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PREFALZ offers numerous options in terms of colour and shape. Thanks to the aluminium material, it is more supple than most comparable folding materials and is thus particularly easy to work with. With its low weight of between 2.2 and 2.3 kg/m², depending on the tray width, PREFALZ is suitable for roof renovations as well as for new buildings, as it adapts perfectly to the different building methods. It can also be expanded with the wide range of PREFA system accessories.

 

 

PREFALZ seamed roof in P.10 zinc grey with roof windows

From barrel roofs to complex roof extensions, domes or large-scale roofs — PREFALZ offers countless individual design options. Folds and bends won’t affect the paint quality at all: PREFALZ is supplied in numerous colours with a smooth or stucco surface, as required.

PREFALZ coils can be ideally used as complementary coils for PREFA small-format products – suitable for various connections and flashings in the dimensions 0.70 × 1,000 mm (coil dimension 60 kg).

It should be particularly emphasised that the PREFALZ aluminium roof complies with reaction to fire classification “A1” – thus non-combustible - according to EN 13501-1. You will find more information on fire protection here.

Residential complex in St. Moritz (Switzerland) with a wooden façade and an aluminium roof with undulating eaves in metallic silver

PREFALZ benefits

For a wide range of applications

from curved arched roofs to complicated roof extensions, domed roofs, classic gable roofs or large-scale roofs

easy to work with, highly resilient

easy to work with even at low outside temperatures

40-year guarantee

on material and colour for products with P.10 surface

Fire protection

PREFALZ non-combustible (A1)

For a wide range of applications

from curved arched roofs to complicated roof extensions, domed roofs, classic gable roofs or large-scale roofs

easy to work with, highly resilient

easy to work with even at low outside temperatures

40-year guarantee

on material and colour for products with P.10 surface

Fire protection

PREFALZ non-combustible (A1)

Complete system

Extensive and coordinated system accessories, ensure safety and durability

Numerous design options

Very wide selection of standard colours as well as smooth and stucco surface, suitable for PREFA’s complete system

Environmentally friendly

Aluminium is 100% recyclable without a loss of quality

Long service life

Aluminium does not rust

Complete system

Extensive and coordinated system accessories, ensure safety and durability

Numerous design options

Very wide selection of standard colours as well as smooth and stucco surface, suitable for PREFA’s complete system

Environmentally friendly

Aluminium is 100% recyclable without a loss of quality

Long service life

Aluminium does not rust

Fold details

In the case of standing seam coverings, pre-profiled or folded panels are folded together to create a rainproof joint. The angled standing seam is primarily used for façades, while the double standing seam is used on roof surfaces. The following two images show the cross-sections of double and angled standing seams:

Installation systems and application types

PREFALZ strips, also known as panels, are produced on roll formers made of strip sheets.

These panels can be installed using sliding clips up to a length of 12m. If appropriate additional measures are taken, longer panels are also possible. The long sheets allow easy, safe and economical installation of the roof covering. The panel may always have the same width or may have different widths in special cases.

Mirror roofings and panel coverings consist of panels which are interrupted by transverse seams. They are often used in buildings with particularly high wind loads or are also used for design reasons.

Detached house with gable roof, roof and façade are covered with PREFALZ from PREFA in P.10 anthracite. The panels of the roof surface extend across the façade. Part of the façade is clad with weathered wood.

Expert tip: for low pitched roofs with a roof pitch from 3°

Roofs designed with PREFALZ have the highest stability and durability. PREFALZ is suitable for very low pitched roofs* with a roof pitch from 3° and can also be installed well even at low temperatures.

* Observe country-specific standards and specialist guidelines.

Overview of PREFALZ colours

PREFALZ offers a wide range of standard colours, mainly in P.10 quality, with a 40-year colour guarantee. The paint coating is applied and fired in several processing stages in the coil-coating process. As a result, the coating layer is malleable and very weather-resistant.

Colour overview (19)

Colour

Code

~ RAL

01 Braun

P.10 brown

7013

02 Anthrazit

P.10 anthracite

7016

03 Schwarz

P.10 black

9005

04 Ziegelrot

P.10 brick red

8004

05 Oxydrot

P.10 oxide red

3009

06 Moosgrün

P.10 moss green

6005

07 Hellgrau

P.10 light grey

7005

08 Zinkgrau

P.10 zinc grey

7030

10 Prefaweiß

P.10 prefa white

9002

11 Nussbraun

P.10 nut brown

8019

17 Reinweiß

P.10 pure white

9010

PREFA dunkelgrau ähnlich DB 703 oder RAL 7043

P.10 dark grey

7043

43 Steingrau

P.10 stone grey

7031

12 Silbermetallic

metallic silver

9006

13 naturblank

plain aluminium

23 Schwarzgrau

black grey

7022

45 Bronze

bronze

7048

46 Patina grün

P.10 patina green

6027

47 Patina grau

patina grey

7042

Notes

  • The RAL values stated are merely approximate values (~), some of which may differ vastly from the original PREFA colour and, under certain circumstances, may not reflect the subjective perception of the colour. 
  • Above all for colour quality P.10, it is almost impossible to define values due to the surface structure.
  • Plain aluminium: The guarantee does not cover surface appearance alterations caused by processing and environmental influences. Follow the instructions.
  • Metallic colours may vary in shade.
  • To identify exact colours for complementary components please consult original samples.

Be inspired by the roof projects already implemented with PREFALZ

The standing seam technique is the classic application type for metal roofs. With this technique, the building’s entire shell, i.e. roof and façade, can be clad to create an image as if from a single mould. The technique enables major creative freedom with uniform or varying panel widths as well as conical panels, in addition to the wide range of colours.

PREFALZ is also used for all details such as mantelpieces, wall coverings, verges and much more in PREFA small-format roofs.

We have summarised more Tips for choosing the right roof covering for you here. You will find even more inspiration in the Reference Gallery or Renovation Gallery.

Do you have any questions about the PREFALZ roof?

PREFA roof tiles, roof shingles, rhomboid roof tiles and FX.12 roof panels are an excellent choice for covering over older existing roofs thanks to their light weight. They can be quickly mounted to the existing roofing material, such as bitumen shingles or bituminous sheeting. This type of covering requires an intact sub-structure, correct roof pitch and other basic structural requirements!

The difference in sound between a PREFA roof and a fibre-cement or tile roof is just 2 to 4 dBA, which is barely perceptible to the human ear.

Aluminium materials are largely corrosion-resistant and rust-free!

Metal roofs can be integrated into the exterior lightning protection system in accordance with the standard ÖVE/ÖNORM EN 62305-3. PREFA flat band roof panels (Prefalz and Falzonal) are therefore permitted as a natural part of the arrester and PREFA small format components (roof tilesshingleroof panelsrhomboid roof tiles) as natural components of the conductor (installation of an additional arrester and connection to the earth). Some standards stipulate exceptions according to which, for example, property at increased risk (e.g. potentially explosive premises) must be specially designed. The integration of PREFA roof and façade systems in the exterior lightning protection system must therefore be planned depending on the specifics of property in question. Information on the necessity and type of lightning protection on a property can be obtained from a lightning protection system engineer or approved electrician. Find out more about lightning protection here.

What do I need to know about fire safety? PREFA roof and façade products (small format as well as Prefalz and Sidings*) are classified as non-combustible in accordance with EN 13501-1 with fire behaviour class “A1”. Fire behaviour class A1 means that products made from aluminium are not flammable. Find out more about fire safety here.

* except products in the colours walnut, grey oak and natural oak (fire class "A2-s1, d0" - non-flammable).

Small hail stones cannot damage a PREFA roof with a stucco surface. In the case of extremely large hail stones, as with all roofing materials, functional damage cannot be excluded. However, even in an extreme hail storm, the piercing of a PREFA roof can almost certainly be ruled out.

Due to the increasing number of mobile phone users, questions about electromagnetic shielding to protect against the emanating radiation are increasingly being asked. As each radio communication is transmitted between sending and receiving devices, the number of transmission masts being erected in populated areas is growing.

For both new buildings and renovations of old roofs, the roof substructure must be checked for a properly installed PREFA roof. In doing so, attention must also be paid to the minimum roof pitches of the respective products.

PREFALZ technical information

Material

coil-coated aluminium, 0.7 mm thick

Standard dimensions

PREFALZ for roofs: 0.7×500 mm; 0.7×650 mm
complementary coil: 0.7×1,000 mm

Weight

approx. 1.89 kg/m²
actual consumption with PREFALZ 500: approx. 2.3 kg/m²
actual consumption with PREFALZ 650: approx. 2.2 kg/m²

Minimum roof pitch*

3° (approx. 5%)

* Observe country-specific standards and specialist guidelines.

Supporting substrate and separation layer*

on fully boarded substrate (at least 24 mm); separation layer as required

* Observe country-specific standards and specialist guidelines.

Fastening

PREFA preformed fixed and long sliding clips (stainless steel) according to static requirements

Caution: Mixing PREFALZ coils with colour-coated aluminium from competitive manufacturers, but also with FALZONAL® material of supposedly the same colour, should be avoided at all costs because of the different paint qualities and subsequent differences in weathering. Only in this way can you enjoy a harmonious-looking façade even after many years. This must also be observed for weatherings, cappings and the like.

Roof structure

PREFA aluminium roofs are produced with a ventilated substructure, with the roof cover and thermal insulation layer separated by a ventilated gap. This means any occasional condensation can be wicked away.

It is mostly the roof membrane that is ventilated, as shown in the first picture. However, the whole attic space can also be ventilated (second picture). 

Separating layers

Separating layers arranged directly under the roof covering can fulfil a variety of tasks. Whether a separating layer is used or which separating layer is to be used should thus be already taken into account in the planning phase.

Separating layers can:

  • protect the wooden formwork or wood-based panels from moisture during the construction phase.
  • improve sound insulation (acoustic decoupling).
  • compensate for minor unevenness in the roof structure.
  • improve the extension and contraction of the trays.
  • protect the metal on the underside against damaging alkaline influences and possible harmful chemicals in substrate.
  • support the roof covering and the sub-roof with regard to the rainproof function.

Depending on the function that a separating layer is to assume, a suitable product must be agreed with the manufacturer of the separating layers. If, for example, the separating layer’s function is to provide additional sound insulation, the use of stronger, heavier bitumen separating layers (e.g. BauderTOP UDS 3 NK or similar) is recommended. If the separating layer is “only” intended to protect the substructure during the building phase, a thinner bitumen separating layer can be used (e.g. BauderTOP TS 40 NSK or similar).

Expert tip: PREFALZ 500 for mono-pitched roofs

Mono-pitched roofs with double standing seam coverings can cause noise due to strong winds. Here, we recommend using PREFALZ with 500 mm tray width and installing a bitumen separating layer. Adequate sound insulation measures must already be taken into account when planning the roof structure.

Tips for processing standing seams

The length of the fixed area is 1–3 metres depending on the panel length. Positioning of the fixed clips area must always be selected in relation to the existing roof pitch (see fig. and associated table) Penetrations or the roof shape may affect the position of the fixed clips area. Elevations with variable fixed clip areas must be separated by separating strips.

Roof pitch

Position of the fixed clip area

> 3°–5° (> 5–9 %)

in the middle of the panel

> 5°–10° (> 9–18 %)

in the upper third of the panel

> 10°–30° (> 18–58 %)

in the upper quarter of the panel

> 30° (> 58 %)

at the top of the panel

Planning & Application

Here, our installers and architects can download specification documents and details about PREFALZ. In the service area, you will find the info sheet about the mantelpiece with PREFALZ, installation guidelines for the walkway support for PREFALZ, installation instructions for Vario solar bracket with PREFALZ as well as PREFALZ installation videos. For more information on the installation, see the PREFALZ installation guidelines. The service area is only accessible for partner companies – please have your log-in details ready. Not received your log-in details yet? Please contact your Local Sales Manager in that case.

Special note for our architecture and design studios: 3D and BIM data, as well as textures for our products can also be found here: digital planning

Accessories for PREFALZ roofs

Clips with stainless steel nails, screws or rivets are to be used to fasten standing seam applications. In order to ensure a sufficient snow guard system, seam clamps including snow guard pipes and ice stoppers are used for standing seam coverings. These system accessories and others, such as the PREFA sealing gel, include PREFA’s complete system.

For a complete, detailed list of accessory products, see our price list (only for processors).

Stainless steel preformed fixed clip (screwed)

Not to be used on the façade in combination with the special screws for an aluminum and steel substructure!

Stainless steel preformed sliding clip (screwed)

Panel length of up to 12 m. Not to be used on the façade in combination with the special screws for an aluminum and steel substructure!

Stainless steel preformed long sliding clip (screwed)

Panel lengths of 12 m - 15 m. Not to be used on the façade in combination with the special screws for an aluminum and steel substructure!

Niro Winkelstehfalzhaft von PREFA

Stainless steel preformed fixed clip (nailed)

-

Niro Winkelschiebehaft von PREFA

Stainless steel preformed sliding clip (nailed)

for tray lengths of up to 12 m

Stainless steel preformed long sliding clip (nailed)

tray lengths 12 – 15 m

Stainless steel fish tailed fixed clip

-

Stainless steel fish tailed sliding clip

tray lengths up to 12 m

Sealing gel

in a cartridge or in a foil pouch

Single pipe seam clamp

for pipe openings with a diameter of 28 mm

Double pipe seam clamp

for pipe openings with a diameter of 28 mm

Seam clamp with oblong hole

for pipe openings with a diameter of 28 mm

Snow guard pipe

for seam clamps; 28 × 2 × 3.000 mm,

Corner connector 90°

for snow guard pipes ⌀ 28 × 2 mm

Ice stopper

for snow guard pipes 28 × 2 mm

Sunny solar bracket

suitable for all PREFA small format products and standing seam systems.

Vario Prefalz solar bracket

Suitable for PREFA double-lock standing seams with a seam height of 25 mm. Available with or without cross connectors. Only suitable for processing PREFA profile rails, and not compatible with other products.

Walkway support for standing seam roofs

roof pitch: 5°-55°

Walkway support for standing seam roofs

250 × 1.200 mm, 250 × 800 mm, 250 × 600 mm, tested according to DIN EN 516-1-A

Walkway connector

-

Roof anchor hook according to EN 517 – B SDH Industry 31

tested for securing 2 persons

Frog-mouth vent cover

for riveting, air intake section approx. 30 cm²

Vent pipe

Ø 100 mm, Ø 120 mm including EPDM seal and cover

Bonded vent pipe cover for standing seam roofs

roof pitch: 3°-52°

Roof hatch cover and wooden frame

roof pitch from 12°

Roof window flashing for Prefalz

available in many dimensions

Special adhesive kit

Content: 1 cartridge of PREFA special adhesive 290 ml, 1 can of adhesive cleaner 60 ml, 1 piece of sandpaper, 1 cloth, 2 adapter nozzles