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concrete slab next to house foundation

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concrete slab next to house foundation chester 08-07-2005
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Posted by chester on August 7, 2005, 11:36 am


I am going to pour 2 ~8.5ft x 3.5ft slabs next to my house, right up to
the foundation. I a then going to install a couple of 3x8 sheds on them
(Arrow vinyl/steel). Anyway, my initial plan was this:

Pour the slabs at a slope, (1/4" per foot) leading away from the
foundation, to ensure water is led away. I was going to accomplish this
by having the boards on the sides of my pour sloped at the angle I want,
and then using these boards to "level" the concrete out when it is
poured, this giving the concrete its slope.

First, will this work? Will the concrete stay at this angle?

Second, is there another way to prevent water from flowing towards the
foundation, besides this? I will have to shim the sheds up, and that
will be a hassle, and I will have ~3/4" ridge at the entrance, which is
somewhat undesirable. Could I pour the concrete true level, and then put
something at the junction of the existing foudnation and the new slab
instead?

thx


Posted by on August 7, 2005, 1:02 pm


As I understand it:
The slabs will be covered by the sheds.
The shed roof will determine where the water goes.
The slab can be flat.
The top of the slab should be above the ground level to exclude water.
The slab should be separated from the existing construction so it
doesn't bond with or hang up on the existing materials and can move
independently.
TB



Posted by chester on August 7, 2005, 1:13 pm



> The slab should be separated from the existing construction so it
> doesn't bond with or hang up on the existing materials and can move
> independently.
> TB
>

Thanks. That makes a lot of sense. I will plan on putting a spacer in
the back. My only issue is, while the slabs will be almost enitrely
covered by the shed roofs, the shed desgign is that the roof slopes
back, so they will essentilly be directling water towards the house. On
the other hand, the side of the house normally takes water from rain
anyway, so I can't decide if this is a bad situation or not.


Posted by Edwin Pawlowski on August 7, 2005, 8:19 pm



>
> Pour the slabs at a slope, (1/4" per foot) leading away from the
> foundation, to ensure water is led away. I was going to accomplish this by
> having the boards on the sides of my pour sloped at the angle I want, and
> then using these boards to "level" the concrete out when it is poured,
> this giving the concrete its slope.
>
> First, will this work? Will the concrete stay at this angle?

Yes, but put expansion joint material against the house.

>
> Second, is there another way to prevent water from flowing towards the
> foundation, besides this?

The shed roof will direct some of it. If the roof is an "A" frame it will
direct some near the house though. Other that holding an umbrella when it
rains, a little pitch is the best way.

> I will have to shim the sheds up, and that will be a hassle, and I will
> have ~3/4" ridge at the entrance, which is somewhat undesirable. Could I
> pour the concrete true level, and then put something at the junction of
> the existing foudnation and the new slab instead?

It's a shed, not a home for billiards tables. You won't notice the slight
pitch.




Posted by chester on August 7, 2005, 1:24 pm


Edwin Pawlowski wrote:

>
>>Pour the slabs at a slope, (1/4" per foot) leading away from the
>>foundation, to ensure water is led away. I was going to accomplish this by
>>having the boards on the sides of my pour sloped at the angle I want, and
>>then using these boards to "level" the concrete out when it is poured,
>>this giving the concrete its slope.
>>
>>First, will this work? Will the concrete stay at this angle?
>
>
> Yes, but put expansion joint material against the house.
>
>
>>Second, is there another way to prevent water from flowing towards the
>>foundation, besides this?
>
>
> The shed roof will direct some of it. If the roof is an "A" frame it will
> direct some near the house though. Other that holding an umbrella when it
> rains, a little pitch is the best way.
>
>
>>I will have to shim the sheds up, and that will be a hassle, and I will
>>have ~3/4" ridge at the entrance, which is somewhat undesirable. Could I
>>pour the concrete true level, and then put something at the junction of
>>the existing foudnation and the new slab instead?
>
>
> It's a shed, not a home for billiards tables. You won't notice the slight
> pitch.
>
>
Thanks. As I said, my main concern now is the shed design, which ia
asingle roof, that slopes BACK. I am not sure this is a really bad idea
or not.


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