THE SUB-ROOF – AN ADDITIONAL PROTECTIVE AND FUNCTIONAL LAYER WITHIN THE ROOF STRUCTURE

 

The times when loft spaces – i.e. the space below sloping roof beams – were used to store food or dry washing are generally over. Consequently, there are fewer and fewer old, exposed loft spaces in which you can still see the underside of the clay roof tiles.

Instead, nowadays lofts are greatly valued as an additional, usable living space and this living space is worth protecting – primarily against dissipating heat and penetrating precipitation.

These days, the entire roof structure serves a systematic purpose. As part of this system, factors including heat transition, vapour diffusion resistance as well as wind and precipitation integrity play pivotal roles.

The sub-roof also plays a vital part in this functional structure. In combination with various clay roof tile and concrete roof tile models, the sub-roof guarantees ideal roof structure protection from penetrating precipitation and condensation under the roof covering.  And thanks to its diffusion capability it also guarantees safe evaporation within the insulation layer. 

The sub-roof therefore plays a crucial role as a protective and functional layer within the overall roof structure. However, nowadays, planners and installing roofers must also react to stricter requirements. They are responsible in terms of execution and durability. For this reason, CREATON is the right choice as the first port of call for roof systems.

CREATON roof membranes provide you with great protection without expensive sub-roof assemblies, even with low roof pitches. Our products have proven themselves in the field over decades and have been subjected to fluidics investigations. We have specified the CREATON pitch limit based on our many years of experience and the products available on the market. The superior technology found in CREATON roof and sub-roof products is a worthwhile investment in terms of costs, functionality and durability, both during construction and in long-term use. In compliance with national rules, our products are therefore considered state of the art and recognised as valid. 

Since this relates to installations according to CREATON manufacturer’s data, which deviates from the German Roofing Trade (ZVDH) specifications, national rules and/or state-specific standards, we recommend that you consult with the end customer or owner of the property and obtain a specific agreement in writing between them and you as the installing roof technician. This will serve to safeguard the interests of both parties from a contractual point of view as a supplement to the service agreement.

ALL INFORMATION FOR SIMPLE, FAST AND SECURE CREATON SUB-ROOF INSTALLATION.
 

 

 

CREATON ROOF MEMBRANES

 

Information on roof pitch limits in the creaton system

Implementation of additional measures when using CREATON clay roof tiles and CREATON roof membranes - Germany

FUTURA
PREMION
SINFONIE
MAGNUM
TITANIA
MZ3 NEU
MZ3 KLASSIK
HARMONIE
MELODIE
MAXIMA PRO
ETRUSKO
HEIDELBERG
VERONA
GÖTEBORG
REGIUS
RATIO
RUSTICO
DOMINO
MIKADO
VISIO
CANTUS
TERRA OPTIMA
KAPSTADTHERZZIEGEL
ELEGANZ
BIBER
KERA BIBER
STRANGFALZZIEGEL
Additional measure according to CREATON manufacturer's data
14 °16 °18 °18 °21 °24 °Pitch limit (Germany)
≥ 14 °≥ 16 °≥18 °≥ 18 °≥21 °≥ 24 °Installation of a trussing sheet/glued sub-roof without nail seals, possible CREATON products: DUO extra, DUO longlife ND extra, TRIO extra, QUATTRO longlife extra
≥ 12 °≥ 14 °≥14 °≥ 16 °≥17 °≥ 22 °Installation of a trussing sheet/glued sub-roof without nail seals, possible CREATON products: DUO longlife ND extra
≥ 12 °≥ 14 °≥14 °≥ 16 °≥17 °≥ 22 °Installation of a trussing sheet/glued sub-roof with nail seals, possible CREATON products: DUO extra, DUO longlife ND extra, TRIO extra, QUATTRO longlife extra
≥ 10 °≥ 12 °≥12 °≥ 14 °≥15 °≥ 18 °Installation as a rainproof sub-roof, possible CREATON products: DUO longlife ND extra, TRIO extra, QUATTRO longlife extra
≥ 10 °≥ 10 °≥10 °≥ 10 °≥10 °≥ 10 °Installation as a watertight sub-roof, possible CREATON products: QUATTRO longlife extra
≥ 7 ° - - - - - Installation as a watertight sub-roof welded in a 7° special solution, please observe separate installation guidelines, possible CREATON products: QUATTRO longlife extra

 

DATA ON ASSIGNING ADDITIONAL MEASURES TO THE CORRESPONDING ROOF MEMBRANE

CREATON roof membrane applications

 Trussing sheet/glued 
sub-roof without 
nail seals
Trussing sheet/glued 
sub-roof with 
nail seals
Rain-proof sub-roofWatertight sub-roofSpecial solution 7° roof
CREATON DUO extra++---
CREATON DUO longlife ND extra+++--
CREATON TRIO extra+++--
CREATON QUATTRO longlife extra+++++

 

 

DATA ON COMBINING ACCESSORIES WITH THE CORRESPONDING ROOF MEMBRANE

Please also refer to the corresponding installation instructions for details. These are available in the download section and on the pages for additional measures.

CREATON roof membrane applications

Roof membrane accessoryDUO extraDUO longlife
ND extra
TRIO extraQUATTRO
longlife extra
Seam adhesive strips NKS++--
Special adhesive SKL++++*
Nail ceiling strips NDS++++
Nail sealant NDM+-+-
Sub-roof connection tape UAB+++-
Sub-roof nail sealing tape NDB PE+++-
Solvent welding agent QSM---+
Brush bottle for QSM---+
Hot air blower for "QUATTRO"---+
Prefabricated exterior corners QUATTRO---+
Sub-roof connection tape UAB---+

* Only for connections

 

Information on material compatibility

Material compatibility table

 

 

CREATON roof membranes

Resistance to?

Can be used for?

Bitumen 

(membrane 
installed
on old bitumen
sheeting or 
shingles or connected to bitumen)
Ammonia

(membrane 
installed on 
agricultural 
buildings or 
buildings contaminated 
with ammonia)
Machine oils

(e.g. oil from
chain saws or similar)
Concrete bed

(E. g. fully 
laid over concrete)
Under
slate / 
fibre cement

(e.g. suitable as base layer)
vertical
installation
Under non-ventilated sheet metal roofs

(e.g. titanium zinc)
Under non-ventilated sheet metal roofs

(e.g. copper, aluminum or stainless steel)
Under non-ventilated sheet metal roofs

(e. g. 
titanium zinc, 
copper, aluminum or stainless steel)
DUO extranoyes1no2yes4yes5nononoyes
DUO longlife ND extranoyes1yes3yes4yes5nononoyes
TRIO extranoyes1no2yes4yes5yesnonoyes
QUATTRO longlife extranoyes1yes3yes4yes5yesnonoyes

 

1  Should be either an insulated roof structure with vapour barrier (project-dependent) or the membrane is laid directly on the planking and the interior space is very well ventilated 

2 Individual droplets should not significantly impair the function of the membrane – droplets of oil usually have no effect.

3 DUO longlife ND extra and QUATTRO longlife extra usually remain stable if they come into contact with grease, lubricant or oil. However, some oil-based liquids may be made with additives, which can damage the film. Compatibility tests are therefore recommended.

4 We recommend backing the membrane with a needle-spun-bonded fabric (geotextile).

5 A base layer according to ZVDH is an additional measure under roof coverings with direct fastenings. The base layer loses its rainproofing function when the roof covering is installed. This is not an installation guideline. The minimum pitch for the roof membrane and increased requirements for a specific project must be observed during application. Footnote 3 (Yes) can also apply here in terms of oil resistance.