Gilsonite Waterproofing FAQ

Why add gilsonite to waterproofing?
To increase hardness, heat resistance and water resistance.

Is it flexible?
Alone it is hard; it is blended with bitumen and polymers for flexibility.

Can it be used under tiles?
Yes, in suitable systems.

Water-based options?
Yes, through emulsions.

How long does a gilsonite waterproofing coating last?
With correct surface preparation and protection from UV and damage, below-ground coatings can last for decades. Exposed roof coatings typically need renewal every 5–10 years depending on climate.

Can I apply it on damp concrete?
Solvent-based products need dry surfaces. Some emulsions tolerate slightly damp substrates – check the data sheet.

What dosage of gilsonite is used?
Typically 5–20 % of the bituminous compound, depending on target softening point and flexibility.

Is it safe for drinking water tanks?
Only if the specific product is certified for potable water.

Can it be painted over?
Bituminous surfaces can bleed through paints. Use a compatible sealer or aluminium paint first.

See waterproofing grade gilsonite.