QUESTIONIs Travertine Porous? - Is Travertine considered impervious? My contractor told me it was when he installed the product, but my zoning officer has informed me that I am now over my impervious coverage for my property.
ANSWERANSWER - I'm not sure what you mean by "my zoning officer has informed me that I am now over my impervious coverage for my property."
Travertine is not an impervious stone rather it is considered a very porous sedimentary stone and is known to have void spaces that are distinctive features of travertine.
The solid portion of the stone is considered vitreous and can be impervious in spots, but can range up to 2.5% absorption and be acceptable for the industry standards.
Not all travertine stones have the same physical properties. They will vary from quarry to quarry and location within the quarry. There are low grade travertine that have a lot of voids and other travertine that have few and are more like a marble. This is true for other types of stone as well.
I hope that answers your question.