tegwin
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| posted on 8/9/09 at 12:19 PM |
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OT soil on the garage roof?
We have a large double garage built into the side of the hill, I would imagine it was build around 1970-1980 it has breezeblock walls with an enormous
RSJ inside and a 2 foot thick reinforced concrete roof....
At present there is nothing on top of it. However the lawn above is much higher than the roof.
What I want to do is build a retaining wall allong the front of the roof and scrape the soil from the lawn onto the roof to level out the area.
A comercial structural engineering company that one of my friends works for has quoted £450 to do a site visit and write a report etc, but would
charge extra to redesign te roof etc.
Has anyone any experience of doing this sort of thing?
Do I need planning etc to move some soil onto the roof?
Any thoughts would be appreciated.
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www.verticalhorizonsmedia.tv
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Mr Whippy
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| posted on 8/9/09 at 12:24 PM |
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You’ll need some good damp proofing. Why is the roof so thick? Is it a nuclear bomb shelter or was it originally designed to be buried or had
originally been buried in the past?
How many garages have a 2 foot thick concrete for a roof anyway?! How much more concrete do you think you need???
[Edited on 8/9/09 by Mr Whippy]
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02GF74
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| posted on 8/9/09 at 12:31 PM |
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astroturf?
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Mr Whippy
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| posted on 8/9/09 at 12:36 PM |
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just a thought...Osama bin laden may be using your garage as a bunker so take care going in alone
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tegwin
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| posted on 8/9/09 at 12:55 PM |
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I assume the roof was intended to carry the load of soil but for some reason was never compelted... but I cant be sure the structure will be strong
enough....
I had thought about damp... A thick waterproof membrane on the roof, followed by a thin (ish) layer of concrete poured on a gradient to force the
water to flow off the burried roof... another waterproof membrane and then the soil, piled on top...
It would only be about 80-100cm deep... but thats quite a bit of weight!
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Would the last person who leaves the country please switch off the lights and close the door!
www.verticalhorizonsmedia.tv
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Richard Quinn
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| posted on 8/9/09 at 01:06 PM |
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Working on a typical double garage size of 5.5m x 6.7m, that would be roughly 60 to 75 tonnes of soil on there. If the roof really is 2' thick,
there could already be more than 25 tonnes of concrete there. I would get a Structural Engineer to look at it first as, if it does come down, 100
tonnes of concrete and soil isn't something you will shift with a dustpan and brush.
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02GF74
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| posted on 8/9/09 at 01:18 PM |
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quote:
Originally posted by tegwin
It would only be about 80-100cm deep... but thats quite a bit of weight!
you mean 80 cm or 80 mm?
one square metre of 80 cm soil will be around 900 kg!!  Or 2 locosts (not pinto engined obviously).
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Puzzled
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| posted on 8/9/09 at 01:18 PM |
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Roof
Be Advised---Dont do it without a professional Engineer accessing the situation. Better to be safe than sorry.
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02GF74
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| posted on 8/9/09 at 01:19 PM |
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quote:
Originally posted by Richard Quinn
100 tonnes of concrete and soil isn't something you will shift with a dustpan and brush.
yeah, but think of funeral cost savings!
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MikeR
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| posted on 8/9/09 at 01:19 PM |
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simple first question - how much weight can a breeze block wall support?
Once you know that you'll have an idea if it can take the roof weight, seems a hell of a lot to a complete numpty like me!
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contaminated
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| posted on 8/9/09 at 01:42 PM |
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This might be useful
http://www.livingroofs.org/
Planning wise you might get away with it under permitted development. Geotechnically speaking I have an engineer who works for me if you need advice.
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Thinking about it
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| posted on 8/9/09 at 02:53 PM |
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Forget the grass it's a PITA it grows and needs cutting. Put a deck on it.
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big-vee-twin
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| posted on 8/9/09 at 04:08 PM |
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How do you know its reinforced?
Have you had a section cut out and looked inside?
Its not a case of how much can a breeze block support there are many types all with different strengths.
You don't know if the roof is only designed to support its own weight only
I too work in the construction industry I am not a structural engineer but an electrical consultant, I would confirm that £400-£500 plus vat a day is
a reasonable charge for a fully qualified consultant engineer personally I charge £400.00 plus vat per day.
Please, Please, get an expert to look at it.
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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maartenromijn
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| posted on 8/9/09 at 06:39 PM |
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Also take weeks of rain, 2 m snow and ice into account! It would be a pity if your bomb shelter caves in and crushes your 7!
BLOG: http://thunderroad-super7.blogspot.com/
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