how much aggregate

how do i estimate how much aggregate i need to cover 50 sq metres to a depth of 50mm, and is this the correct depth for all types of aggreagate please, it will be coming in bulk bags and if in doubt i would go for more not less as there is plenty of garden to cover.

[ 01. April 2006, 11:39 AM: Message edited by: Lady Gardener ]

 

when you say aggregate, what is it to be used for?

 

You multiply the area by the depth you require to get the cubic quantity . A ton of aggregate is reckoned to be a cubic metre, though to be sure you can usually ask for x number of cubic metres.
So 50 sq metres x 0.05 = 2.5 cu metres. (I hope!!!!!)

 

aggregate/gravel is required as ground cover to be laid over membrane, there will be plants for interest, there are two problems,
1) the slope, which in part is >11.5% and will allow gravels to migrate downwards, i can lay a 1"x1" batten to preven migration if necessary.
2) the area is semi-shade, faces east, backs on to house, the soil is acid and rainfall is medium to high, over 40" per annum
the client wants cordylinus!
i might have to suggest conifers!
re the depth of aggreagate, i need more than one tonne, but if i go for 2 tonne the depth will be approx 4cm,this seem ok to me

[ 01. April 2006, 05:30 PM: Message edited by: Lady Gardener ]

 

I think you have got it right LG, much deeper gravel will get a bit difficult to walk on, especially with an incline, the battons will provide a stablising effect, and not to intrusive.
you could meet part way, staggering the plantng, 2 x conifers then 2 x cordylines etc.. if plenty of drainage incororated into planting holes for cordylines they should be ok, but tell client they could well rot off at the base, and let them decide on something else, with your advice!

 

ty rossco,
the borders won't be walked on, and i ve warned customer that the plants may struggle, i understand Cordyline Indivsa and Phormium Texan will tolerate semi shade