RHEINZINK® - Angled Standing Seam

RHEINZINK® - Angled Standing Seam

Construction

General

Metal roofs can be produced in ventilated and non-ventilated designs.

In both cases, water permeation in liquid form (rainwater and moisture from construction) and in the form of steam must be avoided.

The greatest and most persistent cause of moisture influx is airflow transfer through open internal gaps (convection). This is why DIN 4108, Heat Insulation in Buildings, Part 7: "Airtightness of Building Components", has expressly increased the requirements for gap impermeability.

Above and beyong this, the roof covering must meet the criteria for required rainproofing.

Roof Structure with Full Rafter Insulation

RHEINZINK®-angled standing seam covering
Wooden sheathing, 24mm / max. 160 mm, not waterproofed, risk category 0, DIN 68 800
Beams, not waterproofed, risk category 0, DIN 68 800, the required ventilation height must be observed.
Breather membrane Sd-value ≤ 0.2 m (option)
Full rafter insulation, dimensioning as per Energy Saving Regulations, minimum values according to DIN 4108 for individual components must be observed.
Rafters, not waterproofed, risk category 0, DIN 68 800
Plywood sheets act as summer thermal insulation (BFU or OSB boards act as a temperature reducing layer with storage capacity).
Airtight layer with vapour retardant effect, UV resistant, Sd value depending on rafter length, ≥ 2.0m
Installation level
Inner cladding

Further recommendations can be found in the RHEINZINK® construction recommendations.

Roof Structure without Full Rafter Insulation

RHEINZINK®-angled standing seam cover
Structured underlay
Wooden sheathing, 24mm / max. 160 mm, not waterproofed, risk category 0, DIN 68 800
Ventilated layer, the required ventilation height must be observed.
Heat insulation, dimensioning as per Energy Saving Regulations, minimum values according to DIN 4108 for individual components must be observed.
Rafters, waterproofed, risk category 2, DIN 68 800
Plywood sheets act as summer thermal insulation (BFU or OSB boards function as a temperature reducing layer with storage capacity).
Airtight layer with vapour retardant effect, UV-resistant, Sd-value depending on rafter length, ≥ 2.0 m
Installation level
Inner cladding

Further recommendations can be found in the RHEINZINK® construction recommendations.

Air Intake and Exhaust

Ensure that there is sufficient ventilation height.

Standard values for ventilation height and width can be found in the adjacent table. Deviating from standard cases outlined in DIN 4108, constructions may be assessed individually based on structural physics.

Roof pitch	Free ventilation height (minimum)	slit width (net)
≥ 3° - ≤ 15°	8 cm	≥ 4 cm
> 15°	4 cm	≥ 3 cm

Sub-roofs

As per "Guidelines for Metal Roofing Systems" (ZVSHK/ ZVDH/ FVHF)

Rainproof Membrane

Membranes consist of suspended breather membranes, which support the roof in providing protection from the rain. Individual strips are designed with an overlap of at least 10 cm at the edges and are fastened to the substructure (e.g. rafters) with nails or staples.

Rainproof Sub-coverings

Sub-coverings are made up of strips or panels on each side of the substructure. The counter-battening is mounted on top and not integrated into the sub-covering. To seal perforations caused by fasteners, additional sealant or caulking is used.

Rainproof Sub-roof
Sub-roofs are built using waterproof strips. The seam and butt joints must also be waterproof. The counter-battening is not integrated. Perforations occur because of the fasteners of the counter-battening. These can be sealed by using sealant or caulking. Penetrations must be rainproof.

Waterproof Sub-roof

This version is designed using waterproof sheeting and waterproofed seam and butt areas - made waterproof by glueing. The counter-battening is integrated. Waterproof penetrations are also integrated. Openings and open penetrations caused by fastenings are not permitted. Contrary to the other variations, blowing snow and driving rain is not permitted.

Non-Ventilated Roof Structure

Avoid damp building materials and dampness from construction site
Avoid moisture influx via vapour diffusion and airflow
Avoids thermal bridges, e.g. through fasteners
Installation of a structured underlay

A non-ventilated roof structure must be carefully protected against water penetration, as there is no air layer to expel any permeating moisture.

Underlays

Installation is possible either with or without underlays, depending on design.

Regardless of other viewpoints, installation coverings may be required during construction for protection against surface water.

If the underlays remain under the RHEINZINK® roof covering, no water can be absorbed or collected. Several underlays / installation coverings should not be installed on top of each other, as this creates capillaries where water is collected.

Country-specific use of Reinforced Bituminous Waterproof Sheeting for Roofs

State	Make	Standard	Reinforcement	Use	Comments
DK	PF600 PF1500 PF2000 PF2700		Glass fibre Glass fibre Glass fibre Glass fibre	Façade Roof/Façade Roof Roof	(1)
D	V 13 Top TS 25/40	DIN 52143 DIN 52123	Glass fibre Thread	Roof/Façade Roof/Façade	(1) u. (2) (2)
GB	V 13 Top TS 25/40	DIN 52143 DIN 52123	Glass fibre Thread	Roof/Façade Roof/Façade	(2) (2)
NL	VB 240 B11	NEN 6700/02	Glass fibre	Roof/Façade	(1) u. (2)
N	U1 U2 U3	NS 3530 NS 3530 NS 3530	Glass fibre Glass fibre Thread	Façade Roof Roof	(2) u. (3) (2) u. (3)
S	YAP 2500 KOAP 2500	SS 236803 SS 236803	Glass fibre Glass fibre	Roof Roof	(2) u. (3) (4)
CH	F 12 Top TS 25/40		Glass fibre Thread	Roof Roof/Façade	(1)
A	GV 20 GV 25 GV 35	ÖNORM B 3651 ÖNORM B 3651 ÖNORM B 3651	Glass fibre Glass fibre Glass fibre	Roof/Façade Roof Roof	(5)

(1) Standard underlay
(2) Install with ca. 10 cm butt overlap, max. distance between nails ca. 30 cm.
(3) Installation for roof pitches of < 33 % (18°), across the direction of slope, glue with hot bitumen
(4) Do not use underlays in façade area.
(5) Emergency covering in winter (welding procedure).

Underlays are not required:

for protection against wood waterproofing material on RHEINZINK-roofing systems with wooden sheathings and a roof pitch of ≥ 15°.
for protection against wood waterproofing materials on RHEINZINK-façade systems.

Underlays are required:

to protect roof construction and RHEINZINK-roof coverings if substructures are made of: concrete, mortar and plywood sheets, (BFU, OSB / sterling boards, minerally-bonded chipboard, etc.) Foamglas, cement-bonded fibre boards.
to protect RHEINZINK-façade systems if substructures are made of: concrete, mortar, Foamglas, cement-bonded fibre boards.
on roofs with increased requirements for sound insulation (noise reduction with structured underlay of ca. 6 dB A).

Structured Underlays

should be installed as a rule for:
- roof pitches of ≤ 15° (according to DIN 18 339)
- non-porous sheathing (e.g. plywood sheets)
- non-ventilated roof construction

Structured underlays are separators open to diffusion, with an integrated drainage layer made of polyamide braiding (ca. 6 mm - 8 mm high). However, structured braiding may also be installed in conjunction with standard roof sheeting suitable for metal roofing. RHEINZINK° can recommend certain product makes upon request.

Benefits of a structured underlay

Protection during construction (functions as an installation covering).
Protection after construction (function as a drain-off level), e.g. to divert melt-water.
Increased sound insulation (reduces noise level by 6 dB).
Polyamide braiding is environmentally-friendly and can be recycled.