Technical Specification Sheet

GUTTAPRAL BITUMEN ROOF SHEETS

ADVANTAGES
o Excellent dimensional stability
o In time, they develop a full intense colouring through the natural oxidation of the bitumen
o Extremely light and flexible
o Suitable for roofs without bricks, but also for covering existing roofs without having to remove them
o They ensure proper roof ventilation, eliminating humidity and condensation
o Resistant to external agents and to acids
o Asbestos-free
o 15-year warranty on the waterproofing*
*If laying instructions provided by the company is carefully complied with.

PREPARING THE SUPPORT SURFACE

NEW ROOF
You can use a continuous or discontinuous load bearing surface. In this case, you can use a batten with centre to centre distance
depending on the load that the roof has to bear, using 60 x 60mm laths:
Snow load of up to 90kg/m² - centre to centre distance 62cm
Snow load of up to 200kg/m² - centre to centre distance 46cm
Snow load of up to 350kg/m² - centre to centre distance 31cm

ROOF UNDER RENOVATION

Thanks to their flexibility, the sheets can adapt to slight defects in the planarity of the support surface. Nevertheless, prior to the laying
you need to make sure that such irregularities allow for the sheets and the overlaying roofing layer to be properly installed. In addition
to the planarity, also make sure that there are no rough areas with concentrated irregularities that can damage the sheets and
compromise their efficiency. Moreover, the hooks used to secure the gutters must be positioned beforehand at the ends of the gutters,
and specifically underneath.

TIMBER TREATMENT
Prior to laying the sheets, it is recommended to impregnate all the timber that makes up the roof frame which supports the roof with an
insecticide and fungicide treatment on all the timber surfaces, in order to extend its useful life.

LAYING THE SHEETS

When laying the sheets, always start from bottom corner of the roofing, on the opposite direction of prevailing winds. The sheets must
be laid parallel to the eaves, moving up stepwise towards the ridge.

OVERLAPPING
Lateral overlapping: one wave transversal overlapping: 15cm.

FIXING THE SHEETS

The sheets are secured by means of nailing, using zinc-plated nails. Two rows of nails are driven in, parallel to the direction of the
transversal overlapping at the end of each side of the sheets, always inserted from the top of each wave. Other row of nails are driven in
every third wave, always at the head, at the support laths. In case of a reinforced concrete slab, on the other hand, fix the sheets using
the special hook, using 4 to 6 hooks per sheet, with steel nails. Proceed in the same manner for the covering of existing roofs.

VENTILATION
To ensure excellent roof ventilation, avoid obstructing the ridge by making sure that the sheets end at least 5cm from the ridge itself,
thus allowing the air to flow through from the eaves, through the grids and up to the rooftop. This constant flow of air avoids the
proliferation of mould and mildew, and the formation of condensate.
Declaration of Performance Nr. F/0100/1306

1 Unique identification code of the product-type: Bituminous Corrugated Sheet

2 Type, batch or serial number or any other element Bituminous Corrugated Sheets of Category R
allowing identification of the construction product as „Guttanit“, „Gutta Do It“, „Guttapral“
required pursuant to Article 11(4):

3 Intended use or uses of the construction product, in Bituminous Corrugated Sheets for roofing and
accordance with the applicable harmonised technical wall cladding
specification, as foreseen by the manufacturer:

4 Name, registered trade name or registered trade mark Gutta Italia Srl.
and contact address of the manufacturer as required Via L. Mascheroni, 4
pursuant to Article 11(5): I - 20123 Milano (MI)
www.gutta.com

5 Where applicable, name and contact address of the not relevant

authorised representative whose mandate covers the
tasks specified in Article 12(2):

6 System or systems of assessment and verification of System 4

constancy of performance of the construction product
as set out in Annex V:

7 In case of the declaration of performance concerning a Accredited Testing Authority for Materials,
construction product covered by a harmonised University Karlsruhe (KIT) performed the initial
standard: inspection and material testing under system 4 and
issued certificate of constancy of performance,
certificate of conformity of the factory production
control, test/calculation

8 In case of the declaration of performance concerning a not relevant

construction product for which a European Technical
Assessment has been issued:

9 Declared performance:
Harmonised technical
Essential characteristics Performance Test standard
specification
Bending under downward load > 1400 N/m2 EN 534 – Section 5.2.1
Impact strength 400 mm EN 534 – Section 5.2.2
Tearing strength > 200 N EN 534 – Section 5.2.3
DIN EN 534:2010-07
Water impermeability waterproof EN 534 – Section 5.3.1
Tearing strength after
NPD EN 534 – Section 5.4.1
Freeze/thaw ageing
Water impermeability after
waterproof EN 534 – Section 5.4.2
Freeze/thaw ageing
-6
Thermal coefficient α < 100 x10 1/K EN 534 – Section 5.4.3
EN 13501-1
Reaction to fire E EN 534 – Section 5.5.1
External fire performance F EN 534 – Section 5.5.2 EN 13501-5

Dangerous substances NPD

10 The performance of the product identified in points 1 and 2 is in conformity with the declared performance in
point 9. This declaration of performance is issued under the sole responsibility of the manufacturer identified in
point 4.

Signed for and on behalf of the manufacturer by:

Filago, dated 24.06.13 Nicola Bianchi – managing director

 EC declaration of conformity

The manufacturer

Gutta Werke GmbH

Bau- und Heimwerkerprodukte
Bahnhofstraße 51-57
D - 77746 Schutterwald

hereby declares in accordance with § 9 of the German Construction Products

Directive (implementation of the Construction Products Directive 89/106/EEC) that the

corrugated bitumen sheets

for roofing and external wall cladding

type: guttapral
category R

produced at:

Filago plant
Via delle Industrie 4
I - 24040 Filago

meet the standards of EN 534:06 and satisfy the requirements

for CE labelling in accordance with Annex ZA 1.1 or ZA 1.2 of EN 534:06.

System four in table ZA 3.3 was used for the conformity check.
The product is subject to the plant’s own production checks.

Schutterwald, 18.04.2008 ppa Friedrich Kiefer