ESTERDAN 40/GP POL

About this product

ESTERDAN 40/GP POL is a waterproofing bituminous sheet with self-protected surface of 4.0 kg/m².

Composed of a reinforced polyester felt reinforcement, covered on both sides with polymer modified bitumen mastic. On the upper side of the sheet, mineral protection, is used as protective material. The anti-adhesive material used on the lower side is polyethylene film.

Waterproofing under tiles on pitched roofs, both for its thickness and its mechanical resistance. In addition, the mineral self-protection makes work on the roof easier and more convenient. In these cases, the sheet, in addition to adhering to the substrate, will be nailed to the substrate.

Good performance in nailed systems.

The membrane, composed of a bitumen mastic modified with plastomers, provides great performance at high and low temperatures, plasticity and resistance to ageing, which leads to greater durability of the sheet and greater safety of the waterproofing membrane.

Limits deformations and stresses in the waterproofing membrane.

Has good piercing protection from possible mechanical damage, derived from the occasional pedestrian traffic typical of flat roofs.

Preparation of the substrate:

The surface of the base substrate shall be resistant, uniform, smooth, clean, dry and free of foreign bodies. In the case of thermal insulation, the boards shall be laid in a grid and without gaps between boards of more than 0.5 cm.

Top layer of multi-layer membranes with mineral self-protection. The sheet is laid in the same direction as the bottom sheet, with the overlap line offset by approximately half of the roll. The sheet is fully welded to the bottom sheet with a blowtorch. The overlaps are to be welded and shall be 8 cm in the longitudinal direction and 12 cm in the transverse direction. To join the transverse overlap at the ends of the rolls, it is necessary to heat the transverse edge of the lower sheet in a strip of 12 cm, eliminating or embedding the protective aggregate in the bituminous mass and then weld the end of the next piece.

Waterproofing under tiles on pitched roofs. The adhesion of the sheet to the substrate is done with a blowtorch. In the case of mortar or concrete substrates, first apply a bituminous primer (CURIDAN, IMPRIDAN 100, MAXDAN or MAXDAN CAUCHO). If the substrate is a weldable thermal insulation board, i.e. finished in asphalt (Rocdán A or Rocdán PIR VA), the primer is not necessary. The overlaps are to be welded, and shall be 12 cm in both longitudinal and transverse directions. To join the transverse overlap at the ends of the rolls, it is necessary to previously heat the transverse edge of the lower sheet in a strip of 12 cm, eliminating or embedding the protection aggregate in the bituminous mass and then weld the end of the following piece. The mechanical fastening is carried out at the overlaps.

In case of new construction and renovation, possible chemical incompatibilities with other sheets shall be taken into account.

If it is necessary to adhere to metallic or slightly porous elements, a bituminous primer (IMPRIDAN 100) shall be applied to the entire surface to be welded beforehand.

The design and installation of the roof structure and finishes shall be in accordance with the falls prescribed in BS 6229. Ponding of water on the surface of the waterproofing is to be avoided through effective design of roof falls and drainage systems. Throughout the life of the roof, periodic maintenance inspections should be conducted in line with the manufacturer's recommendations.

This product is part of a waterproofing system, so all the documents referred to in the Danosa Solutions Manual must be taken into account, as well as all the regulations and legislation that must be complied with in this respect.

Self-protected sheets finished in light colours perform better thermally.

Sheets made of plastomeric bitumen require more blowtorch input than sheets made of SBS elastomeric bitumen in order to work properly. It is important to take this aspect into consideration when welding the sheets to the substrate, when welding the overlaps of the sheets and when welding the sheets to each other.

There is no chemical incompatibility between the Danosa range of SBS elastomeric bitumen and APP plastomeric bitumen membranes.

Not suitable as cap sheet on green roofs; use GARDEN variant.

Do not use as a single-ply membrane, except for waterproofing under tiles on pitched roofs.

Possible incompatibility between thermal insulation and waterproofing shall be checked.

Special attention must be paid to the execution of the singular points, such as parapets (meetings with vertical and emergent elements), drains, expansion joints, etc.

Polyurethane foam shall not be sprayed directly on top of the waterproofing without the use of a suitable separating layer (geotextiles, mortar layers, polyethylene film, etc).

If expansion that could affect the sheet is expected, a geotextile separating layer (DANOFELT PY 200) shall be used between the sheet and the extruded polystyrene insulation panels, so that each product expands independently.

Please refer to DANOSA UK Technical Statement ‘Flat Roof Waterproofing – Cleaning and Maintenance Recommendations’.

Before moving the pallet, check the condition of the shrink-wrap and reinforce if necessary.

The product must be stored in a dry place protected from rain, sun, heat and low temperatures.

The product must be stored in an upright position.

This product should not be installed when the temperature is below -5ºC.

This product is not toxic or flammable.

Pallets shall not be stacked on top of each other.

Danosa recommends consulting the safety data sheet for this product, which is permanently available at www.danosa.com, Knowlegde Portal, or it can be requested from our Technical Department.

In all cases, the Occupational Safety and Hygiene standards, as well as the standards of good construction practice, must be taken into account.