The Roof Cleaning Institute Of America Training & Certification Forum
"Find A Certified Roof Cleaner Directory"

Members Login
    Remember Me  
Post Info TOPIC: Tannins leached into sandstone - Please help

Premium Member Roof Cleaning Institute of America

Status: Offline
Posts: 1
Tannins leached into sandstone - Please help

I recently did a verandah soft wash. Where the painted wooden ceiling meets the sandstone blocks, there has been some tannin run.

Basically there's a very small gap where the ceiling meets the sandstone wall. This is undercover. I washed the ceiling part and some water go up the crack and a large amount of tannin ran down and stained the sandstone.

It also ran through the cracks in the painted ceiling where there's cracked paint. The result is pretty terrible.

I intend on going back and applying the following options. Please let me know your thoughts and experience.

1. Start by wetting and applying oxalic acid and a little dawn with a paint brush. Leave it 30mins, maybe scrub and rinse.

2. If it doesn't fix it, try applying S percarbonate in same fashion.

3. As a back up I read Phosphoric acid might work like oxalic acid.

As for the paint drip stains, what's the best solution for that? Percarbonate? Bleach? or just paint it?

Thanks everyone.


Page 1 of 1  sorted by
Quick Reply

Please log in to post quick replies.

Tweet this page Post to Digg Post to

Create your own FREE Forum
Report Abuse
Powered by ActiveBoard