QUESTION

Sealing Limestone - I have an old home built in 1889 out of sandstone blocks. They are dirty and crumbling. I'm intending to powerwash and seal them. Can you recommend any sandstone-specific sealer product? Thank you.

ANSWER

ANSWER - You should experiment with several sealers that are recommended for your application to see which performs the best.

If the stone is crumbling that may be an indication that the stone is spalling from being subjected to excessive moisture or that it is porous and being subjected to freeze thaw climatic conditions.

Go to our website at www.CTaSC.com to find Resources and click on Cleaners and Sealers to see some of the various manufacturers of sealers.

It sounds like your limestone is very porous, so consider something like Miracle Sealants Porous Plus that may require a pretreatment of 511 impregnator. There are some sealers that give you a natural look afterwards and others that give you an enhanced (wet) look.

Good Luck,