DWD Waterproofing Membranes For Green Roof Garden Waterproofing
Be different from roof waterproofing system, there are two points
need to be mentioned in the roof garden waterproofing system -
preventing water seepage and preventing plant roots from piercing
the waterproof layer and penetrating the buildings.
Roof garden waterproofing system
Plants roofing is a systematic project, of which the anti-root
waterproofing layer is especially important. DWD WATERPROOFING has
been committed to the roof garden waterproofing system for many
years. And DWD waterproofing membranes can effectively solve it
There are two types of roof garden - Concrete roof plants (heavy
roof garden) and light steel, wooden roof plants (light roof
For the heavy roof gardens, the waterproofing workers should be
adopted double-layer waterproofing layers system. The first layer
is an ordinary waterproofing layer, which can effectively solve the
problem of water leakage. The second layer is planting the
anti-root waterproofing layer. With the function of chemical roots
resistance and root-repelling, plant roots can be effectively
For the light roof garden, due to the overall light weight of the
planting system, a polymer waterproofing membrane with roots
resistance properties can be adapted to solve the problem of
waterproofing and plant root puncture.
DWD 120 Waterproofing Membrane Brochure.pdf
The feature of DWD waterproofing membranes:
Bonded with cement adhesive and suited to full-surface bonding.
Excellent water resistance, anti-seepage, chemical corrosion
resistance, aging resistance, and root resistance.
Good seams strength.
Hot air weldable for seams and joints.
Excellent tensile strength.
Adaptability to deformation and flexibility at low temperature to
meet wide temperature range application.
Long service life.
Guarantees are more than 30 years under correctly applied.
DWD Waterproofing Membranes
DWD WATERPROOFING can offer you a good performance roof garden
Specification of DWD waterproofing membranes please see the table
|Thickness (mm)||Length (m)||Width (mm)||Area (m2/roll)|
|Note: Width can be customized such as 1500mm, 2000mm, 3000mm and
Installation or laying methods of DWD waterproofing membranes:
Fasteners can be set in the overlapped membrane edge, and weld the
overlapped edge with a hot-air gun.
DWD waterproofing membranes can be fully bonded with DWD cement
Can be welded with the auto-moving welding machine to for the
smoothest appearance and excellent seams strength.
Installation Guides of Roof Garden Waterproofing System
- Netload of roof garden should be more than 300Kg/m2.
- In order to ensure the waterproofing, drainage and fire protection
requirements of the roof, the planting surface should not be
directly close to the edge of the building facade and should be
separated by a 20-50 cm gravel belt or a lightweight material belt.
Moreover, it should be separated by 10 cm gravel belt or
lightweight material in the sewers, drainage holes, and vents, etc
of the garden roofs.
- The closed-water test should be carried out to test the existing
waterproof capacity. Installing the waterproofing layer first if
there is a leakage.
- In order to prevent the roots of the plants from penetrating the
waterproof layer, a partition layer should be specially set on the
waterproof layer to avoid damage to the building structure.
- Installing a moisturizing layer to maintain the moisture content of
the plants’ nutrient substrate.
- Installing the drainage aeration panels to improve the ventilation
of plant roots and substrates.
- Placing the filter membrane to prevent artificial matrix particles
from flowing with water. The filter layer should be directly laid
on the storage and drainage aeration panels. When laying, the
effective width of the lap joint shall not be less than 10 cm and
extend to the side wall of the building, and the folding height
shall not be less than 20 cm.
- Laying a lightweight synthetic nutrient substrate. It is necessary
to select a light artificial planting substrate that has the
advantages of safe and reliable physical and chemical indicators
such as water storage and drainage, fertilizer retention,
ventilation, and adiabatic expansion coefficient and a pH value of
- It should be selected the drip irrigation and sprinkler irrigation
for a rational irrigation system. Watering should be done
immediately after planting, after which it is not suitable for
overwork, because plants will grow too fast due to large water, and
the comprehensive resistance will decrease.
- Plants fixation should be carried out if necessary.
The performance of DWD 120 waterproofing membranes meets the
standard of GB 18173.1-2006 High Polymer Waterproofing Materials as shown below.
|Breaking tensile strength (N/cm)||Normal temperature||≥60|
|Elongation at break rate (%)||Normal temperature||≥400|
|Tear strength (N)||≥20|
|No leakage performance (0.3Mpa, 30min)||No leakage|
|Bending temperature under low temperature (℃)||≤-20|
|Heating expansion amount (mm)||Extension||≤2|
|Hot air aging (80 C x 168h)||Retention rate of tensile strength (%)||≥80|
|Breaking tensile strength retention rate (%)||≥70|
|Alkali resistance (mass fraction of 10% Ca (OH) 2 solution at
normal temperature x 168h)||Retention rate of tensile strength (%)||≥80|
|Breaking tensile strength retention rate (%)||≥80|
Artificial climate aging
|Retention rate of tensile strength (%)||≥80|
|Breaking tensile strength retention rate (%)||≥70|
|Bond peel strength||Standard test condition (N/mm)||≥1.5|
|Soaking retention rate (%)||Normal temperature x 168h||70|
|composite strength (surface and core layer) (N/mm)||≥1.2|
Normal temperature is defined +25℃.
The performances of artificial climate aging, heating expansion
amount, breaking tensile strength at 60℃should not consider if
waterproofing membranes are non-exposed.
For the total thickness is less than 1.0mm of the resin composite
waterproofing membranes, its elongation at break rate should not be
less than 50%, and other performances can reach more than 80% of
the prescribed value.
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