Roofing membrane, Roofing membrane for hard sheathing, Façade membrane for closed joints DELTA®-FOXX (PLUS)

The robust and extremely long-lasting sarking and sheathing membrane effortlessly withstands even the most extreme weather conditions. It is highly resistant to ageing and retains its high level of performance even after years of use.
DELTA®-FOXX PLUS enables the creation of a rain-proof sub-roof in accordance with roofing regulations*. In addition, the outstanding properties of the membrane material makes it ideally suited for use as base layer and dividing layer beneath slate or metal coverings.

New from 01/01/2023

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    Verarbeitung von DELTA®-FOXX PLUS
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    Selbstkleberand von DELTA®-FOXX PLUS
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    DELTA®-FOXX PLUS in der Anwendung
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    DELTA®-FOXX in der Anwendung


  • Impressive longevity
    With our DELTA®-FOXX PLUS the focus is on longevity. The sheeting maintains performance over the course of years and protects reliably. This is confirmed by extreme quality and long-term testing and the corresponding ETA. Roofs have reliable protection with DELTA®-FOXX PLUS.
  • 30-year warranty promise
    We guarantee that our DELTA®-FOXX PLUS, expertly installed, will retain its function (resistance against water penetration: Class W1) for 30 years. If a problem arises regarding this during this time, we will not only replace the material, but also bear the cost of removal and installation. The procedure is simple: one call and we take care of it.
    Click here for the statement of warranty.
  • Highly flame-resistant
    DELTA®-FOXX (PLUS) satisfies the requirements of Euro fire class B-s1, d0. This means that the roofing membrane makes a key contribution to preventive fire protection. The spread of flames is rendered more difficult, and homes and their inhabitants are protected. 
  • Secure adhesion 
    The integrated self-adhesive edging enables direct gluing of the overlap and reliably prevents the penetration of cold air and moisture to the insulation. This enables more energy efficiency and living comfort. The self-adhesive edging also enables overlapping adhesion.
  • Reliable rain protection
    To ensure that rainwater rolls off more rapidly, DELTA®-FOXX PLUS features the lotus effect. In combination with the DELTA® system components, the sheeting enables the creation of a rain-proof sub-roof in accordance with ZVDH* regulations.
  • Excellent temperature and UV stability
    The sheeting is particularly temperature resistant up to +150°C and specially UV stabilised. It can be subjected to solar radiation for up to 24 weeks without any anticipated material damage. Benefit from this characteristic – even where the roofing process is delayed somewhat.

Equipped with DELTA®-AMS and DELTA®-BiCo technologies.


DELTA®-FOXX (PLUS) was specially developed to meet the high requirements of being laid on wooden sheathing. Laying directly onto thermal insulation or as lining is also possible without any problems. In addition, the membrane is also suitable for use as temporary roofing and as a base layer under metal roof coverings, fibre cement panels or slate.

Rainproof sub-roof *

DELTA®-FOXX (PLUS) enables the creation of a rain-proof sub-roof in combination with the DELTA® system components  (DELTA®-SCHAUM-BAND, DELTA®-FLEXX-BAND and DELTA®-THAN). The breathable solution with DELTA®-FOXX has already proved its worth in over 25 years of practical use, however, it deviates from the diffusion-restricting solution described in the ZVDH regulations. Reference is made to this in the offer.

Base layer and dividing layer beneath slate or metal coverings
In combination with the DELTA® system components DELTA®-FOXX PLUS can be used as a dividing layer and a base layer beneath metal roof coverings – also with low roof inclines from 3°. In combination with DELTA®-ENKA VENT it can also be used to create a structured dividing layer. Beneath slate the membrane offers a secure base layer, as the wooden sheathing can dry faster due to the low Sd value of 0.02 m. In addition, the practical roll dimensions means that DELTA®-FOXX PLUS offers significant laying advantages compared to classic bituminous base layers: wider, longer, faster! The sheeting can be laid from the ridge to the eaves.

More information on laying can be found in our laying instructions for sarking, underlay and sheathing sheeting as well as in the laying instructions for dividing layers and base layers.

* An “individual contractual agreement” is to be concluded between contractor and customer for the creation of a rain-proof sub-roof.

Technical data

Material Highly tear-resistant PET non-woven fabric with breathable, watertight dispersion coating. With integrated self-adhesive edging
Fire behaviour B-s1, d0 (EN 13501-1)
Fire index no. 5.2/RF2 (VKF)
Tear-out force approx. 370/270 N/5 cm (EN 12311-1)
Water resistance Class W1 (EN 1928)
sd value approx. 0.02 m (EN ISO 12572)
Temperature resistance -40°C to +80°C
Short-term maximum temperature resistance of material (< 8h / day) to +150°C
UV-related outdoor weathering duration 24 weeks
Temporary roofing function 6 weeks
Resistance to driving rain passed (Driving rain test for lining and underlay sheeting – TU Berlin)
Increased ageing requirements passed (ZVDH product data sheet, table 1)
Weight approx. 270 g/m²
Roll weight approx. 20 kg
Dimensions 50 m x 1.50 m
CE conformity EAD 030218-01-0402 / EN 13859-2




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Would you like information on detailed product properties, use cases or other technical topics?
Then feel free to contact our application department on +49 2330 63 578 or

Do you have questions about prices, availability or the status of your order?
Our sales service will help you with these matters on +49 2330 63 636 or