Another gravel driveway - Should i consider using tack coat

[mwb1]

Hi All,

I've read the related pages of the main site carefully so hopefully i won't upset anybody!
I have two basic questions about my planned driveway;
1) Would it be worth covering the sub-base with something like tack coat prior to wacking down the gravel?
2) How essential is it to lay a geotextile membrane under the sub-base if the sub-grade is solid, will weeds really get up through 150mm of wacked down type 1

Thanks

[Tony McC]

1 - NO! Tack coat is used to bond new macadam to old macadam or concrete. It is NOT used to bond gravel to a granular sub-base.

2 - You need the Geo-textile membrane FAQ

[rms]

Weeds will grow on and through most surfaces given half a chance so using a membrane to minimize this problem is recommended.