Repairing sandstone pillar on bay window

[drtoneill]

I am looking to repair the crumbled pillar (which I'm pretty sure is sandstone) that makes up the columns of a bay window. See the photo.

Untitled

• drtoneill
• 23 Jan 2014
• 1

Basically I need to know what to use for it? E.g. Cement? Filler? Epoxy?

And should I bother making some formwork / batens for it or do I just clean it out and then shape it as the mix dries.

And given I probably plan to paint the whole lot white it probably doesn't matter too much about a colour match.

 

[bobby spray]

Using concrete or any other non porus media will likely make the situation worse. I used lithomex on my own house for similar problems. Its used a lot up here on historic buildings.

 

[drtoneill]

Thanks for your reply!

I have looked at Lithomex, and I could certainly have a go at it with that.

But given we're most likely going to paint over it all with some masonry paint does that not reduce the concern about future erosion?

 

[bobby spray]

hello, even if you are going to paint over the repair the key to preventing further erosion is maintaining a permeable substrate. Make sure that the paint you use is breathable - just like the sandstone