DELTA MASONRY BARRIER 0.4 mm, 50 cm × 25 m (12.50 m² per roll)
Dörken's DELTA-MAYERWERKSSPERE (Damp-Proof Membrane) is a 0.4 mm thick polyolefin damp-proof course for horizontal cross-sectional sealing in and under walls. The 50 cm wide roll, with a length of 25 m, covers 12.50 m². Select a membrane width that completely covers the wall and extends laterally for connection to the surface waterproofing.
Who is the DELTA dam suitable for?
It is aimed at bricklayers, construction companies and building owners who want to protect basement exterior walls and plinth areas against rising damp; you can find further products for basement construction in our Basement category .
Areas of application and selection criteria
According to the manufacturer's documentation, the track is suitable for the following applications and test points:
- Cross-sectional sealing in and under walls
- Earth-contact masonry according to DIN 18533, class W4-E
- Basement exterior walls subject to shear stress (MSB-Q)
- Protection at the wall base against splashing water and ground moisture
- Room usage classes RN1-E to RN3-E
- Choose a track width greater than the wall thickness
- Allow at least 5 cm of overlap for connections.
- Connection to bituminous waterproofing is possible
Your advantage: thin track with shear connection
The double-sided profiling bonds with the mortar and thus transfers shear forces within the sealing layer, which is important for basement exterior walls under earth pressure.
The perfect width for your wall
The membrane must completely cover the wall and extend beyond both sides far enough to prevent moisture bridges.
Overhang for connection
The manufacturer specifies a minimum overhang of 5 cm beyond the masonry; as a calculation example, the 50 cm strip is suitable for wall thicknesses up to 40 cm with a 5 cm overhang on both sides.
butt joints and overlaps
The joints between the panels are overlapped by at least 20 cm; according to the manufacturer, 5 cm is sufficient for glued joints.
Processing and limits
Lay the membrane in a single layer in a leveled, fresh mortar bed; the specified temperature resistance ranges from −30 °C to +80 °C, the fire behavior corresponds to class E.
Product features at a glance
Technical data: DELTA masonry barrier 0.4 mm, 50 cm × 25 m
The values are taken from the manufacturer's technical data sheet and declaration of performance; area and roll weight are calculated from the roll dimensions.
| Manufacturer / Product | Dörken, Delta Masonry Dam |
| Roll dimension | 0.50 m × 25 m (width × length) |
| Area per roll | 12.50 m² |
| thickness | approx. 0.4 mm (EN 1849-2) |
| Basis weight / Roll weight | approx. 280 g/m² (EN 1849-2); calculated approx. 3.5 kg per roll |
| Material / Surface | Polyolefin, black, profiled with anti-slip properties on both sides |
| Waterproofing | Passed, 400 kPa / 72 h (EN 1928, Method B) |
| Water vapor diffusion | sd value approx. 100 m (EN 1931) |
| Folding at low temperature | approx. −40 °C (EN 495-5) |
| Temperature resistance | -30 °C to +80 °C |
| Fire behavior | Class E (EN 13501-1) |
| Classification | DIN 18533: W4-E, RN1-E to RN3-E; DIN SPEC 20000-202: MSB-Q |
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