Painting a non self- protecting bitumous surface

 November 19, 2020. 2:44 PM

Normally the painting of a polymer bitumen membrane is carried out directly on the exposed surface. This membrane must be an APP (plastomeric) membrane as SBS membranes cannot be left exposed to UV rays. The membranes also require mineral protection (slated membranes) or a heavy protection (cls or other cover). Where traditional membranes modified with APP are concerned these membranes must be painted with the correct substance (POLYVER ALU) which is compatible with the bitumous matrix of the product. Usually the paint has a highly reflective quality and often has an added aluminium pigment in order to maintain the membrane temperature as low as possible; therefore it is not advisable to use dark colours.

1. When can I paint?
Painting should take place after a sufficient time period (from 2 to 3 months) has elapsed in order to allow any oily residuals to evaporate. Where extremely hot weather is concerned the time period may be longer. Occasionally, it may be necessary to wash the coating before painting.
ATTENTION: Ignoring the necessary time scales may lead to the rapid deterioration of the paint

2. How many coats do I need to apply?
Normally two coats are applied, leaving a few hours between applications.

3. What are the variables regarding the longevity of the paint?
The longevity of the paint depends on its latitude, exposure and obviously the quality of the paint used. Normally the longevity is estimated to be 3 years and after this time it is necessary to repaint the covering. Normal practise foresees an inspection visit every year in order to check the state of the painted covering and to intervene in any areas which may have deteriorated.

4. When and what can cause puddles of water to form?
ATTENTION: Due to erroneous or non-existent cover sloping; puddles can form. These puddles can provoke accelerated paint ageing, which initially shows itself as ‘superficial webs’ only to develop into peeling.

5. What do I need to check?
Check the overflow pipes.