An owner asked me to repair a roof for a never maintained ~60 year old construction, which lost its impermeabilizing properties, and year after year leaks water from rains through the concrete over the interior of the building.
For impermeabilization, an asphalt layer covered with a paint layer was used in the original construction, which -as the picture shows- has clear signs of damage due to all the passing years, peeled off, dryed, by the action of sun, and showing moss evidence due to the humidity in the zones not directly exposed by sun, penetrating the structure.
Beside the evident structural damage at the joint zones, which will be properly solved case by case, my question is how to reisolate the roof from the water action, and I do not have any clear clue about
- How to remove the paint layer for working directly over the asphalt, applying temperature over it to re-melt it,
- Or even remove the original asphalt layer at the compromised zones.
Which should be your best advice for removing or retrofitting a damaged impermeabilizing asphalt?