Vapordiffuser

Elastoplastomeric membrane with deep bitumen underside rivets, to allow water vapour to diffuse and provide waterproofing in the base layer in multi-layer systems.

Vapordiffusor is an elastoplastomeric polymer-bitumen waterproofing membrane with deep bitumen rivets on the underside strengthened with reinforced fibreglass mat for the diffusion of humidity on damp concrete surfaces, old bitumen waterproofing layers, or for isolating waterproofing layer from movements of insulating panels. Vapordiffuser is designed to resolve the problem of vapour diffusion while guaranteeing an optimal adhesion in time, also on uneven surfaces. The underside of Vapordiffuser has a series of large bitumen bubbles covering approximately 35% of the surface with the exception of the overlapping side strip.

The bubbles protrude from the membrane 3.5 – 4 mm and once they have been heated with the torch, become thick adhesive bitumen rivets that adapt the uneven substrate, forming a strong bond. The membrane rests on the surface supported by the bituminous rivets and an air space is formed between the waterproof layer and the substrate with a series of voluminous and diffusing channels for the humidity which are much more effective than those obtained using traditional perforated sheets. When torched, the supporting surface of bubbles increases slightly until it forms an adhesive area of approx. 40% of the supporting surface. The adhesive surface is greater than that which can be realised with perforated sheets (not more than 20%) and furthermore all of bitumen rivets adhere, while with the installation of performated sheets on uneven surfaces there is a risk that the waterproofing layer will not adhere to a great deal of the substrate and be blown away by strong winds.

Vapordiffuser bubbles are closer together than holes in perforated sheets, therfore adhesion and mechanical stress from the substrate are more uniformly distributed. Vapordiffuser is a very thick membrane which forms a waterproof layer roughly 5 mm after installation (thickness of a perforated sheet is less than 1.5 mm) and so the layer is isolated better from movements of substrate. Furthermore, the greater adhesive surface makes it possible to install vapordiffuser on steeper sloping surfaces (up to 40%), without mechanical fixing. Vapordiffuser is strengthened with reinforced rot-proof fibreglass mat and both sides are coated with Flamina, a plastic film that melts when torched.

USES

Vapordiffuser is used for both new construction and renovation work, on damp surfaces where blisters can form in the waterproof layer. It can be installed as a visible layer directly on concrete or to renovate an old bituminous layer which is no longer waterproof. The water vapour is drained through aerators which are easy to install in the Vapordiffuser membrane. Vapordiffuser can be used on certain types of insulating panels that can move and damage the waterproof layer.

ADVANTAGES

• Economical – eliminates a labour process
• Speeds up construction times
• Can be applied to damp / high moisture concrete
• Air-space for greater diffusion
• Greater bond area than vented systems
• Waterproofing membrane and vented sheet in one

Product specification sheet

Manufacturer

Parchem Construction Supplies

Parchem Construction Supplies Pty Ltd is part of the Alesco Group and operates within the ‘Construction and Mining Division’. Alesco is a publicly listed industrial brands company who supply a diverse range of specialist industrial products in Australia and New