Posted: Fri Mar 30, 2007 10:52 am
Hi
I'm about to embark on my first trip down dig your old one up and try to relay it in the time span allowed by your missus IE is it possible to do it by last week !
I have an old Patio which consists of 600 x 600 concrete slabs on a grit / cement mix with the subbase being earth which after at least 16 years of having been under the old patio should be well compacted, and having now moved my greenhouse an area of concrete which also has 2 drain covers within that area.
The existing level is about 1 and a bit bricks below DPC.
The area to be relaid is about 29 Sq m
The missus has chosen an 'Eastern natural Limestone' from our local merchant which hopeflly will look good with a nice variation of slab colour.
So.
If i have taken on board the guidance and advice from this site have i got the following right.
With the old taken up i will try and get the level to 150mm below DPC, but an element of digging out may be needed to get the slope right, also the drains will probably require adjusting - reducing in height slightly. they are old lids and frames - i dont know what lies beneath though.
Having got ythe ground work done i intend to lay a bedding of 10:1 dry mix - or is semi dry mix the correct term. about 40mm on the existing soil and individually lay the flags.
I'm not sure of what other pitfalls i'm likely to come across but i suppose the questions i have at the moment are'
1. is 40m sufficient
2. Is the existing subbase adequate im assuming due to the use of the area that a more harder subbase isn't required
3.for the edging slabs can a stiffer mix eg 6:1 be used or should it be a wetter mix.
4. If digging out more of the sub base and weakening the top layer im assuming that if it is rolled or compressed down then it should be OK
5. Any advice on cutting the stone would be appreciated as well as the drain coveres / chambers.
6. any views on the Limestone as well before its ordered ?
Thanks
I have found this site invaluble, its clear and easy to understand.
KevB
I'm about to embark on my first trip down dig your old one up and try to relay it in the time span allowed by your missus IE is it possible to do it by last week !
I have an old Patio which consists of 600 x 600 concrete slabs on a grit / cement mix with the subbase being earth which after at least 16 years of having been under the old patio should be well compacted, and having now moved my greenhouse an area of concrete which also has 2 drain covers within that area.
The existing level is about 1 and a bit bricks below DPC.
The area to be relaid is about 29 Sq m
The missus has chosen an 'Eastern natural Limestone' from our local merchant which hopeflly will look good with a nice variation of slab colour.
So.
If i have taken on board the guidance and advice from this site have i got the following right.
With the old taken up i will try and get the level to 150mm below DPC, but an element of digging out may be needed to get the slope right, also the drains will probably require adjusting - reducing in height slightly. they are old lids and frames - i dont know what lies beneath though.
Having got ythe ground work done i intend to lay a bedding of 10:1 dry mix - or is semi dry mix the correct term. about 40mm on the existing soil and individually lay the flags.
I'm not sure of what other pitfalls i'm likely to come across but i suppose the questions i have at the moment are'
1. is 40m sufficient
2. Is the existing subbase adequate im assuming due to the use of the area that a more harder subbase isn't required
3.for the edging slabs can a stiffer mix eg 6:1 be used or should it be a wetter mix.
4. If digging out more of the sub base and weakening the top layer im assuming that if it is rolled or compressed down then it should be OK
5. Any advice on cutting the stone would be appreciated as well as the drain coveres / chambers.
6. any views on the Limestone as well before its ordered ?
Thanks
I have found this site invaluble, its clear and easy to understand.
KevB