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I need to re-point some steps to the garden. I have a bag of yellow pit sand that has been sitting around all summer and now has gone a bit green.
Is this still ok to use?
I only need about a bucket of it as i have some sharp sand as well.
Ta
Do you intend to mix it with cement? If so scrape the green off and it will be fine.
If you want to pour just sand between the joints in the slabs its probably too wet. For this go to the nearest builders merchant and get kiln dried sand.
Sharp sand isn't ideal as the small stones in it make the mortar hard to use. You normally use soft sand for mortar.
Thanks folks
Planning on mixing 2/1/1 pit/sharp/cement. I was told to use a bit of sharp as it makes it stronger but your probably right footflaps as some of the joints are quite small.
The steps are in the shade 10 months of the year and I wanted to avoid moss problems.
I just want it strong as I never want to do it again.
Add some plasticiser to make the mortar a bit more usable, also helps reduce frost damage (I think).
Are you talking about lime? The builders left half a bag lying around I can use unless if its right.
You can use Lime, although that tends to change the mortar colour a bit - often used when re-pointing period homes as they originally used Lime Mortar.
I use synthetic stuff eg Febmix: http://www.everbuild.co.uk/febmix-admix
thanks very much ff