Johnny Jekyll Posted June 28, 2023 Share Posted June 28, 2023 Building a manhole. Can't source any Grano Dust locally for the benching. Is it ok to use Sharp Sand instead for the benching? If so what's the ideal mix? Presume adding a bit of Febmix helps (I'm not quick enough to work with SBR)? Thanks guys. Link to comment Share on other sites More sharing options...
saveasteading Posted June 28, 2023 Share Posted June 28, 2023 Yes that's fine. Don't be tempted to use too much cement. Also keep it fairly dry mix, but pre-wet the surface. All of that will keep it strong and limit cracking. If you've got time to get it in, some fibre additive would make it even stronger. 1 Link to comment Share on other sites More sharing options...
Johnny Jekyll Posted June 28, 2023 Author Share Posted June 28, 2023 Thanks @saveasteading , so what would the ideal mix be when using sharp sand? 3 sharp to 1 cement? Any building sand? Link to comment Share on other sites More sharing options...
saveasteading Posted June 28, 2023 Share Posted June 28, 2023 Confession time. I don't trust my memory, and always read what it says on the cement bag. Just don't add a bit more cement for luck.. or water for convenience. You shouldn't need building sand, as the febmix will make it workable.. 1 Link to comment Share on other sites More sharing options...
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