How to clean and restore a limestone wall?

Hi,

I've been reading and researching about limestone walls, and got to confess I'm super confused on how to proceed.

I have a limestone wall (2 blocks tall) which is looking like could use some tender, love and care.

Behind this wall there's a quite big planter box, or garden if you will.

I would like to keep the stonish look and feel, although I want it to look cleaner and not call attention to it's defects and darker areas.

What options do I have for better look and feel?

Pictures attached.

Thanks in advance.

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Comments

wooshka

Hi @tfacchini ., great outdoor area you have there, i think the easiest way is to hit it with a decent pressure cleaner , that will work wonders with no chemicals, the black does come back eventually as the roots grow into the limestone.

It looks like the stone where your pump is stays a bit damp so that probably contributes to the problem

You can get a moss killer for it but once a year with the pressure cleaner will keep it looking tops

EricL

https://www.workshop.bunnings.com.au/discussion/comment/24482#Comment_24482

Hello @tfacchini

Welcome to the Bunnings Workshop community. It's a pleasure to have you join us, and thank you for sharing your question about your limestone wall.

It's great that you've received excellent advice from @wooshka. Looking at the photos you posted, it seems that only the very end has been affected by moss and mould. I suspect this is caused by the corrugated roof covering that area and has concentrated the flow of water. This concentration of water has caused it to grow mould faster than the other parts of your wall.

I suggest trying out 30 Seconds 5L Outdoor Cleaner Concentrate in combination with Mr Clean Handheld Iron Scrub Brush. Please make sure to give the cleaner enough time to activate, once enough time has passed you can begin scrubbing the wall. When all the black stain has been removed rinse the wall with your garden hose.

If you need further assistance, please let us know.

Eric

Jewelleryrescue

https://www.workshop.bunnings.com.au/discussion/comment/74880#Comment_74880

Hi @tfacchini @EricL

Your limestone dosnt look to bad a little work it will definatly get a new face lift.

EricL suggested 20 seconds clear concentrate. Well it is Sodium Hypochloride 1-5% and Sodium Carbonate basically a mould killer. and will take out the darker stains with a couple of applications most importantly it isnt acidic and wont hurt the stone .

Can I also recommend washing/cleaning you tiles around the pool as I see a little dirt build up . Ordinary dish washing soap and water will also go along way to general cleaning as it is good for removing oily stains etc

If you wish to use a pressure wash as @wooshka suggested under 1000psi should be safe or simply dont go to close to the stone will work with any pressure washer. Usually a house hold hose on jet will do the job too if you cant access a pressure washer like

ERicL said.

I notice some extra mortar on the limestone face so consider I recently used an orbital sander 90 grit to polish a off tile glue and mortar smooth joints on a 2 tile high marble wall to good effect so that is an option if some of those stains really stubborn I would finish off sanding with 240 grit just to give the wall a little extra smoothness. Be carful how much you sand and where you sand as you can form a depression or make one are extra smooth which is out of character to the rest of the wall.

The best thing you can consider doing next is applying a natural stone and paving sealer that dosnt make things slick it enters deep into the stones pores and helps blocks mold and alge regrowth. Or if it dose come back it wont constantly need you to to clean it as deep or hard.

Berger Jet Dry 1L Stone & Paving Natural Sealer I/N: 1410034

$38.50

Yodapressure

Hi Tfacchini

I found a Good Pressure washer with a Heater connected works a treat . Make sure you seal job after it has dried . Next year will be an easier clean that way .

Cheers Steve

EricL

https://www.workshop.bunnings.com.au/discussion/comment/32622#Comment_32622

Hello @Yodapressure

Welcome to the Bunnings Workshop community. It's wonderful to have you join us.

Thank you for sharing your experience with cleaning a limestone wall. Let me tag @tfacchini to make them aware of your recommendation.

Were keen to hear more about all your projects and plans around the house and garden. Please feel free to reach out whenever you need assistance or would like to share a project with the community.

Eric

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