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Installation of the batten structure on a pitched roof — Grava Group

Grava Group · Pitched roofs

A roof build-up
that works
as a system.

From rafter structure and insulation to the visible finish: assemble a reliable pitched roof build-up from compatible layers and materials.

Request advice View materials
01
Constructionrafters and counter-battens
02
Thermal envelopeinsulation and airtightness
03
Roof coveringslates or ceramic roof tiles

Not a standalone product, but a considered assembly

A pitched roof — construction, comfort and the home's character.

A good roof protects against precipitation, retains heat, regulates moisture and defines the architectural image. Therefore the choice does not start only with the tile colour, but with the logic of the entire roof build-up.

Below are solutions from the Grava Group book: insulation materials, protective layers, natural and fibre-cement slates, and Koramic/Wienerberger ceramic roof tiles.

3types of insulation for comparison
4main layers in the roof build-up
20+ceramic roof tile models in the book

Four themes · one complete roof build-up

Discover materials

01 · Koramic · Wienerberger

Ceramic roof tiles: from the classic wave to the precise flat line.

The Koramic/Wienerberger series in the book contains profiles for different visual scenarios — with ready-made locking systems, adjustable ranges and a complete assortment of ceramic accessories.

Choose a model

See each individual tile and a large reference image of its application on the roof. Technical choice depends on pitch, underlay, batten spacing and the specific detail.

Stormpan 44 applied to a pitched roof
Stormpan 44 in contextSoft wave and a warm, traditional roof appearance.
The roof tileKoramic Stormpan 44 roof tile
Datura applied to a pitched roof
Datura in contextA clean, flat line for a contemporary roof appearance.
The roof tileKoramic Datura roof tile
Nueva applied to a pitched roof
Nueva in contextLarge flat fields with a crisp, calm rhythm.
The roof tileKoramic Nueva roof tile
VHV Vario applied to a pitched roof
VHV Vario in contextA classic undulating profile with refined dimensions.
The roof tileKoramic VHV Vario roof tile
OVH Klassiek applied to a pitched roof
OVH Klassiek in contextRecognisable wave, visible across a full roof plane.
The roof tileKoramic OVH Klassiek roof tile
Koramic Standard applied to a pitched roof
Standard in contextA recognisable historic profile with a calm, consistent roof surface.
The roof tileKoramic Standard roof tile
Oude Pottelbergse Pan 451 applied to a pitched roof
Oude Pottelbergse Pan 451 in contextA historic form with the warm character of a classic tiled roof.
The roof tileOude Pottelbergse Pan 451 roof tile
Tegelpan Elfino applied to roof and façade
Tegelpan Elfino in contextA flat, refined skin that unifies roof and façade.
The roof tileKoramic Tegelpan Elfino roof tile
Jura Nova applied to a pitched roof
Jura Nova in contextA generous tile with a subtle wave for large roof areas.
The roof tileKoramic Jura Nova roof tile
Tradiva applied to a pitched roof
Tradiva in contextElegant soft undulation for a timeless residential image.
The roof tileKoramic Tradiva roof tile

Stormpan 44

Neutral, softly undulating tile with a traditional shape. The book lists single-side and double top locking, a wide range of accessories and the possibility of disassembly/reuse.

Indicative from the book: ±20.7 pieces/m²; minimum pitch with the catalog-specified underlay — 22°, and with Fleece Premium — 15°.

Datura

Flat tile with locking systems, aimed at a clean drawing on roof and façade. In the book: double side and double top locking, adjustable batten spacing and five colour variants, including matte glazes.

The model has 2 hanging lips for quick, stable installation; adjustable top locking — 37 mm.

Nueva

Modern flat model with double side locking, wide deep top locking and adjustable batten spacing. Characterised by a restrained, fast-to-lay surface.

The book mentions 2 hanging lips and markers for easy cross-placement.

VHV Vario / Klassiek

Profile for traditional character with modern mounting precision. VHV Vario has double adjustable side locking; the range includes natural, engobed and glazed colours.

The catalogue states a guaranteed lateral tolerance of 6 mm and an adjustable top locking range of 20 mm for VHV Vario/Klassiek.

OVH Klassiek

Classic undulating tile with a recognisable silhouette. The book presents blue-grey, black and natural tones and a series of ceramic accessories for finishing the roof.

Two hanging lips are listed for stable placement and a broad range of accessories.

Standard

A historic model with ribs and locks. The catalogue mentions both straight and staggered placement, along with three colour variants.

Indicative from the catalogue: ±14.2 pieces/m²; minimum pitch with Fleece Premium — 15°.

Oude Pottelbergse Pan 451

A hollow tile with a historic silhouette and contemporary quality. The catalogue lists natural red, rustic and weathered Vieilli colours.

Indicative from the catalogue: ±18.6 pieces/m²; minimum pitch with Fleece Premium — 15°.

Tegelpan Elfino

Flat drawn clay tile with a continuous fixing rib. Suitable for an ultra-fine, contemporary look on roof and façade.

Indicative from the catalogue: ±28–30.2 pieces/m², depending on batten spacing; minimum pitch with Fleece Premium — 15°.

Jura Nova

A large tile with gentle undulation, double side locking and a flat crown. Designed for a crisp character on larger roof surfaces.

Indicative from the catalogue: ±9.7–11.3 pieces/m²; minimum pitch with Fleece Premium — 15°.

Tradiva

A light tile with soft undulation, deep locks and adjustable batten spacing. The catalogue highlights flexible use and a timeless wave line.

Indicative from the catalogue: ±12.5–14.1 pieces/m²; minimum pitch with Fleece Plus — 10° at 340 mm batten spacing.

Other models in the book: Stormpan Vario 18, Stormpan 993, Panne TFP, Tradiva, Alegra 10, Jura Nova, Standard, Mega, Tegelpan 301, Tegelpan Plato, Tegelpan Elfino, Elfino Grande, Romane 1.2 Actua 10, Vlaamse Pan 401, Oude Pottelbergse Pan 451 and Tegelpan Rustica.

02 · Foundation for durability

Heat, dryness and ventilation — in the right order.

The roof system is selected as a whole: the insulation retains heat, the vapour-retarding layer limits internal moisture ingress, and the underlay protects against water and wind while remaining vapour-permeable.

Renovation of a pitched roof with insulation
Renovation without compromiseSubstrate condition, building height and the chosen finish material determine the work plan.
Section of an insulated pitched roof
  1. 1Finish layer (roof covering)
  2. 2Underlay: water and wind barrier
  3. 3Insulation layer
  4. 4Vapour barrier on the interior

Selection logic

The book contains practical scenarios for Belgium. Final thickness and combination of layers must be checked per project.

  • Available height: PIR approximately 12 cm.
  • Raising the roof pitch is often not possible: glass wool between the rafters — guideline 20–22 cm.
  • A balance is needed between height and thermal resistance: combination of PIR + glass wool.
PIR insulation board from the Grava Group book

PIR / PUR

Rigid insulation boards for situations where maximum insulation at minimal thickness is required. Boards are also used for flat surfaces; PUR foam helps achieve airtight connections in complex junctions.

≈ 0,022–0,025λ, W/(m·K)
Glass wool roll from the Grava Group book

Glass wool

Rolls and boards for timber constructions and the space between rafters. Practical where acoustics and fire resistance are important and layer thickness is less critical.

0,030–0,040λ, W/(m·K)
Rock wool boards from the Grava Group book

Rock wool

Flexible and rigid boards with increased fire resistance. Suitable for load-bearing constructions; the book notes it is not a typical solution to fill between joists.

≈ 0,032–0,040λ, W/(m·K)

03 · Cedral · fiber-cement slates

Sharp geometry or the effect of natural stone — one material, different characters.

Fiber-cement slates make it possible to combine roof and façade cladding. The book shows Cedral models for crisp, modern lines and for more natural, texture-rich expressions.

Modern architecture with dark fibre-cement slates
Slate around each gableLight slates articulate the clear geometry of each roof.
Roofs with light fibre-cement slates
One material across the ensembleA light slate skin connects the roofs and façades of several buildings.
Choose a Cedral model

View the slate in detail

Choose a variant to view a large image from the book and the associated colour options.

TECTA Smooth slate on a modern roof and façade
TECTA SmoothFlat matte slates with straight, precise edges.

TECTA Smooth

For crisp architecture where a flat, pure surface on roof and façade is desired. The book mentions the UV-cured protective layer, colour fastness and low-maintenance matte finish.

TECTA Smooth slate — product view
Colour from the book
Dark grey

Colour reproduction is indicative; choose finally based on a current Cedral sample.

TECTA Texture slate with visible relief
TECTA TextureRelief and an authentic slate impression in large detail.

TECTA Texture

The textured finish, broken edges and matte tone are intended for projects seeking the character of natural slate with the practical advantages of fibre cement.

TECTA Texture slate — product view
Colour from the book
Dark grey

Colour reproduction is indicative; choose finally based on a current Cedral sample.

Alterna fibre-cement slates applied to modern terraced houses
AlternaA modern slate that brings roof and façade into one coherent image.

Alterna

Smooth matte finish and straight edges for a calm, contemporary rhythm. Available in several formats and with straight or chamfered corners.

Alterna slate — product view
Colours from the book
Dark greyMetal greyPearl greyBrick redEvening pinkLight greyBlackCrystal whiteDark brown

Colour reproduction is indicative; choose finally based on a current Cedral sample.

New Stonit fibre-cement slates applied to modern homes
New StonitThe texture and serrated edge bring the appearance closer to natural slate.

New Stonit

A material with texture, irregular slate edges and a matte appearance for a warmer, more natural slate expression on roof and façade.

New Stonit slate — product view
Colour from the book
Slate grey

Colour reproduction is indicative; choose finally based on a current Cedral sample.

04 · Natural slates

Natural slates: the depth of texture that cannot be imitated.

The natural structure and subtle nuances of a dark-grey palette make each surface unique. In the book the material is used in both modern architecture and pitched roofs.

Modern house clad with natural slates
Natural texture without visual noiseSlates act as an architectural skin and unite roof and façade lines in a striking way.
Pitched roof with natural slates
Expressive slopeDark surfaces emphasise geometry and junction details.

What is valued about natural slates

The Grava Group book emphasises the natural character, long lifespan, weather resistance and minimal maintenance. This material is suitable for projects where provenance, texture and a timeless appearance are important.

dark grey nuancesnatural texturemodern architecturerenovation
Natural colour nuances
Dark greyBlue-greySlate greyAnthracite tone

Natural slate varies by quarry and by delivery; always confirm the final shade with a physical sample.

Request slate variant

Choose an expressive finish. We'll build the rest into a working system.

Send your brief — the Grava Group team provides directional advice on insulation, membranes, slates and ceramic roof tiles for pitched roofs.

Contact Grava Group
Source of materials and images: the Grava Group book. Model features are presented as a catalogue overview; for ordering and installation coordination with the manufacturer's current technical documentation and the project conditions is required.
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