Help Needed With Crumbling Concrete - Concrete, Stone & Masonry - DIY Chatroom Home Improvement Forum

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Old 09-21-2013, 06:50 PM   #1
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Help needed with crumbling concrete

Hi all -

Our home has 6 lamp posts (the most elaborate ones are shown in the attached photo). They were built around 1998, and due to the intense freeze/thaw cycles here in northern Canada, I've noticed that the posts are starting to crack/crumble. The worst parts are the caps that sit atop the posts.

I've priced new ones out and they're around $95 a piece. ouch.

So I've made a plywood form and I'm going to try making my own. I have some high-strength concrete and I figure that for a total cost of under 10 bucks per cap, I will give it a try first.

My question is, can anybody recommend a good product for keeping the water out of these things? I think the builder of our house must have had shares in Allen Block because there's a pile of it around our property. And I'd like to prevent it from turning to crumbs. What about paint? If I could find some decent dark grey paint for only the caps, would that keep the water out? And spray some sort of sealer on the rest of the structure?

thanks for your help

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Help needed with crumbling concrete-dsc_4005.jpg  


longshanks is offline   Reply With Quote
Old 09-24-2013, 07:04 AM   #2
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impo, there isn't a paint yet that's suitable for the task you propose,,, there ARE sealers but, like most other coatings selected largely by budget, they require maintenance,,, silicone siloxane would be a good choice to me.


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Old 09-24-2013, 10:39 AM   #3
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You might want to look into a water repellent instead of a sealer,also unless you get plenty of vibration on your form when you cast the top,you may have to mix a slurry to finish the top and edges. this link is just to give you an idea what to use,i'm not endorsing this product,and try for a mineral base instead of water based.
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