Architects memo no.
15: February 1982
Resene X-200 acrylic waterproofing membrane
Resene X-200 Acrylic Waterproofing Membrane occupies pride
of place in the Resene range of waterproofing products.
Development of this product started several years ago in an effort
to replace the bitumen-based Resinac system. Although bitumens have
long excelled at waterproofing, adhesion of subsequent colour coats
have always been suspect. Within the course of the development programme,
elastomeric polymers were evaluated and test marketed in specific areas.
The results gained, however, indicated that whilst the elastomeric polymers
appear superficially attractive because of their great extensibility,
their poor weathering and dirt retention properties were considered
sufficient drawbacks to prevent the full commercialisation of this type
of technology. Consideration of the elastomeric requirements led us
to subscribe to the argument that no coating can stretch over a propagating
crack since this would require finite extension between two points that
were infinitely close.
There is however, a definite need for a coating to be able to follow
the cyclical expansion and contraction of existing cracks and joints.
We considered that an expansion of between 100 and 200% would be ample
to cope with what will be met in the field. (This represents a 1mm crack
opening to between 2 and 3mm).
Maintaining expansions down to this level allows optimisation of weather
and dirt resistance.
We therefore ranked the properties required in the coating as follows:
- It would require to be based on a highly water-resistant vehicle.
- It should develop maximum adhesion to cementitious substrates.
- It should be able to achieve maximum film build with a variety of
- It should have inherent durability characteristics such that the
aesthetic appearance of the coating matches its waterproofing performance.
- It should be able to stretch up to 200% above its original length.
The above parameters have been incorporated into Resene X-200 to the
extent that Resene is prepared to guarantee for ten years, the
weathering and waterproofing characteristics of the product.
We consider the major advance with this product, to be the fact that
most surfaces will be able to be waterproofed and weatherproofed with
a two-coat system. Application costs therefore are similar to any two
coats of conventional paint, combined with the benefits of multi coat
high build systems.
Full technical and application data is available in Resene
Data Sheet D62.
Pastel colours are available in any quantity of Resene X-200 and any
colour from the Resene colour range at a minimum order size of 200 litres.
This equates to surface area of 600 square metres. Selected buildings
around the country have been coated in this product and could be available
for inspection if desired.
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