The bituminous membrane MULTIGUM GARDEN is a special root resistant membrane suitable for the waterproofing of areas with plants. The non woven polyester as a reinforcement, the polyester film in the upper surface which act as a root barrier, in combination with the special root growth inhibitor additive in the compound, give a complete protection from roots.
PHYSICAL AND CHEMICAL CHARACTERISTICS
Bituminous compound
- very good high and low temperature resistance
- very good resistance to ultraviolet rays
- absolute watertightness
- good resistance to acids and alkalis
- resistant to root penetration
Non-woven polyester
- very good tensile strength and elongation
- tear resistant
- resistant to static loading
Polyester film
- impenetrable to roots
PACKAGING
The roll dimensions are 10m long and 1m wide (other rolls dimensions are available on request).The rolls are supplied on wooden pallets and are held in position by a heat shrunk plastic bag.
INSTRUCTIONS FOR USE
Surface preparation
The surface must be smooth ,clean and dry ,free from dust,oils grease and other debris.
The surface is then treated with bituminous primer (EXTRALAC PRIMER at a consumption of 0.2-0.25 kg/m²) or with elastomeric bituminous primer (ELASTOLAC at a consumption of 0.3-06 kg/m²) and allowed to dry at least for 24 h before the application of the membrane.
As an alternative bituminous emulsion EXTRACOAT can be used at a consumption of 0.5-1 Kg/m² or EXTRACOAT RUBBER at a consumption of 0.5-1 kg/m².
Application
The membrane is unrolled on the dry primer coating and aligned before it is rolled back.
The membrane is unrolled again while the lower surface is heated and especially the primer by means of a propane gas torch, until the polyethylene film starts to melt , ensuring the adhesion of the membrane to the substrate.
Side laps must be at least 10 cm and end laps 15 cm. When the bonding of the roll is completed we torch the overlaps taking care not to weaken them by extreme heating and by means of a trowel we press to achieve good bonding.If we want to strengthen up the overlaps or other sensitive points on the roof (ventilators,drains,upstands,etc),we can apply bituminous sealants Masticgum No1 or Masticgum No2 (for horizontal or vertical surfaces respectively) which should prodect from sun radiation with one or more layers of bituminous aluminium paint ALUCOAT.
In a multi layer system the first layer can be applied as loose laid, partially attached or fully adhered. The subsequent layers must always be fully adhered.
During the application care must be taken so that the overlaps of the subsequent layers to not coincide with the overlaps of the previous layer.
