Thorfun Posted March 19, 2021 Share Posted March 19, 2021 Hi all. I'm looking to get some MOT Type 3 for my driveway sub-base. it seems that some places offer Limestone and some Granite as the primary aggregate. simple question, is there any difference in performance or cost between the two? Link to comment Share on other sites More sharing options...
PeterW Posted March 19, 2021 Share Posted March 19, 2021 Limestone can go claggy in rain then rock hard when it dries which causes run off issues. Granite doesn’t bind as tight so is more free draining. 1 Link to comment Share on other sites More sharing options...
markc Posted March 19, 2021 Share Posted March 19, 2021 Granite is free draining while limestone holds water. The load bearing capacities are not important with a driveway. Granite should be more expensive but they may have railway ballast available. 1 Link to comment Share on other sites More sharing options...
Thorfun Posted March 19, 2021 Author Share Posted March 19, 2021 Just now, PeterW said: Limestone can go claggy in rain then rock hard when it dries which causes run off issues. Granite doesn’t bind as tight so is more free draining. thank you! so, if purchasing for a permeable SUDS compliant sub-base it would seem that granite is the better option. ? Link to comment Share on other sites More sharing options...
Thorfun Posted March 19, 2021 Author Share Posted March 19, 2021 1 minute ago, markc said: Granite should be more expensive but they may have railway ballast available. that's interesting. the company that has granite type 3 does have railway ballast on their website. I think I'll give them a call and ask if I can put that down with type 3 on top to reduce costs (assuming the railway ballast is cheaper than the type 3 that is!) Link to comment Share on other sites More sharing options...
PeterW Posted March 19, 2021 Share Posted March 19, 2021 Some BCOs will not allow you to use railway ballast as it’s a waste product and can be contaminated. Link to comment Share on other sites More sharing options...
Thorfun Posted March 19, 2021 Author Share Posted March 19, 2021 13 minutes ago, PeterW said: Some BCOs will not allow you to use railway ballast as it’s a waste product and can be contaminated. ok, they didn't have any anyway. I think I'll stick with Type 3 all the way down. might be a bit more expensive but reduces complexity and risk. Link to comment Share on other sites More sharing options...
Phaedrus Posted March 19, 2021 Share Posted March 19, 2021 41 minutes ago, markc said: The load bearing capacities are not important with a driveway. My understanding is that both hydraulic and structural considerations are important for a SUDS compliant driveway. What full make up do you see as being acceptable? Link to comment Share on other sites More sharing options...
nod Posted March 19, 2021 Share Posted March 19, 2021 3 hours ago, Thorfun said: Hi all. I'm looking to get some MOT Type 3 for my driveway sub-base. it seems that some places offer Limestone and some Granite as the primary aggregate. simple question, is there any difference in performance or cost between the two? Reclaimed will give you the best of both and also cost less Link to comment Share on other sites More sharing options...
joe90 Posted March 19, 2021 Share Posted March 19, 2021 3 hours ago, PeterW said: Some BCOs will not allow you to use railway ballast as it’s a waste product and can be contaminated. They will only notice if they sniff it ? 1 Link to comment Share on other sites More sharing options...
Thorfun Posted March 19, 2021 Author Share Posted March 19, 2021 1 hour ago, nod said: Reclaimed will give you the best of both and also cost less can't find any at the moment down this way. tried lots of companies and no one seems to have recycled type 3. which is a shame. Link to comment Share on other sites More sharing options...
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