Ask a tradesman
Subbase for paving
Hi I'm replacing my paving slabs in back garden and I've already started to dig down to a level and found it already had a harcore type base. Will it be ok to just whack sand and cement and lay the flags or would i need to start again. Also my garden is on a slope towards house. Where do I lay my first flag ? Thanx
4 Answers from MyBuilder Landscape Gardeners
As long as you have a depth of 75 - 100mm of compacted hard core an old sub-frame would do the same job. If you put a vibrating plate over the top it will compress your existing.
If your garden is on a slope I would advise to level out your patio and incorporate a good drainage system.
laying your first flag is down to preference, as long as your square off your property and at the right heights your good to go!
Hope this guides you!
Answered 6th Dec 2018
Lay slabs falling away from house. I would leave a gravel trap near house maybe 75/100mm allowing for water to escape and no generate damp onto your property. I'd always do 100mm hardcore base with plate compactor run over the top. 50mm of sharp sand and cement
Answered 6th Dec 2018
As long as the sub base is 100mm think once compacted it should be ok to lay on. If it’s contaminated with soil I would advise to start again. There’s a drainage product on the market called an aco drain they are 1m in length 140mm in width and 80mm deep these are designed to go against your house so your patio can slope back towards the drains to avoid water collecting at the edge of patio/turf. I would start against the aco drains with a wet sand and cement mix at a 4x1 ratio
Answered 7th Dec 2018
1. If you have a natural fall towards the house you need aco drainage channels
Along the house joining a drain or soak-away.
2. If the old slabs had sunk then there is not enough hardcore down,
Otherwise the base should be fine ( check for any weak areas )
3 if you are thinking of Indian paving make sure you lay on a full mortar bed
To avoid staining
4. I always start a full slab at the drain channel and Try to avoid any cuts,
And work my way out to the exit to prevent waking on it if possible.
All the best. Kev.
Answered 17th Dec 2018
Post your job to find high quality tradesmen and get free quotes
- All Questions
- Architectural Services
- Bathroom Fitting
- Carpentry & Joinery
- Carpet & Lino
- Central Heating
- Chimneys & Fireplaces
- Conversions - General
- Damp Proofing
- Demolition & Waste Clearance
- Fascias, Soffits & Guttering
- Gas Work
- Groundwork & Foundations
- Hard Flooring
- Kitchen Fitting
- Landscape Gardening
- Loft Conversions
- New Builds
- Painting & Decorating
- Restoration & Refurbishment
- Security Systems
- Tree Surgery
- What is the rough price for a paving slab base for a 8x6 shed
- Whats the minimum crusher/mot and grit sand that should be put under paving slabs for a driveway and how much just for a walkway patio? For the walkway is grit sand without crusher/mot acceptable?
- Issues with newly laid block paving & walling
- Dansand No Grow Block Paving Sand for Paving Slabs