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What type of weedkiller
ankersj
Posts: 1
I am considering laying a new flagged terrace about 20m long and 2m wide over an existing grassed area with shrubs. There is sandstone bedrock less than 400mm below existing surface.
Before I start to lay new flags and substrate.....
What weed killing should I do - How should I do it and what with? How long should I wait before starting the flagging work?
Should I also put down a weed membrane? If what type?
0
Posts
Any total weedkiller will do. Check info on packets and don't buy a selective weedkiller. Glyphosate takes 2 weeks to get to the roots and kill the entire plant and you do need to kill the roots of any perennial weeds in there.
Having said that, you are surely not laying directly onto soil? Since you'll need to dig out the grass and soil to make a stable substrate layer for your cement and pavers why bother with a weedkiller? Don't forget that you'll need to make sure that the terrace is below your damp proof course and has a slope away from the house of 1cm per 60cms of width to ensure it drains rainwater away from your foundations.