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Posted by Finite on November 6, 2006, 4:25 pm
I am adding a new laundry room to the back of my house. The contractor
had a footer poured and block installed around the new room. Then the
area was filled with gravel.
The current house has a crawl space under it adjacent to this new
expansion.
When they poured the concrete slab in this new room I noticed that it
was 9" higher than the slab in the current crawl space.
The new slab is up against the new block on 3 walls, but on the 4th
wall the gravel and concrete slab are up against the wood of the old
house.
Is there a concern about this?
There doesn't seem to be anything between the gravel and concrete and
the house.
TIA,
Tim
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Posted by RicodJour on November 6, 2006, 4:40 pm
Finite wrote:
> I am adding a new laundry room to the back of my house. The contractor
> had a footer poured and block installed around the new room. Then the
> area was filled with gravel.
> The current house has a crawl space under it adjacent to this new
> expansion.
> When they poured the concrete slab in this new room I noticed that it
> was 9" higher than the slab in the current crawl space.
> The new slab is up against the new block on 3 walls, but on the 4th
> wall the gravel and concrete slab are up against the wood of the old
> house.
> Is there a concern about this?
> There doesn't seem to be anything between the gravel and concrete and
> the house.
Yes. Wood in contact with concrete should be pressure treated wood or
it will eventually rot. If it is not pressure treated wood there
should be a flashed/waterproofed barrier. At a minimum, assuming the
crawlspace is dry, some 30# building felt, roll roofing or roofing
membrane should have been used in your situation.
I don't understand why the two slabs don't align. Perhaps there were
reasons other than not wishing to excavate additional material.
R
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Posted by Bobk207 on November 7, 2006, 12:20 am
RicodJour wrote:
> Finite wrote:
> > I am adding a new laundry room to the back of my house. The contractor
> > had a footer poured and block installed around the new room. Then the
> > area was filled with gravel.
> > The current house has a crawl space under it adjacent to this new
> > expansion.
> > When they poured the concrete slab in this new room I noticed that it
> > was 9" higher than the slab in the current crawl space.
> > The new slab is up against the new block on 3 walls, but on the 4th
> > wall the gravel and concrete slab are up against the wood of the old
> > house.
> > Is there a concern about this?
> > There doesn't seem to be anything between the gravel and concrete and
> > the house.
> Yes. Wood in contact with concrete should be pressure treated wood or
> it will eventually rot. If it is not pressure treated wood there
> should be a flashed/waterproofed barrier. At a minimum, assuming the
> crawlspace is dry, some 30# building felt, roll roofing or roofing
> membrane should have been used in your situation.
> I don't understand why the two slabs don't align. Perhaps there were
> reasons other than not wishing to excavate additional material.
> R
I might be misreading the description but it sounds like the original
house is perimeter foundation & raised floor on joist syste,m?
The new addtion is going to be a slab on rasied earth contained by the
block wall on foundation & back filled then a slab poured?
The old was floor on joists & the new is "slab on grade"?
The cause of the "mismatch" is the change in floor / framing systems?
In any case care must be taken such that conditions do not exist for
the old wall & joist system to either wick water or other wise get
water from the new construction.
Seems to me that they shoudl have jsut stuck with the old system,
except perhaps they were concern about creating a "lost" crawlspace?
cheers
Bob
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Posted by on November 10, 2006, 2:23 am
ok lets see if we have this right
you have a house that has a crawl space
the contractor built an addition on to your house
and did not match the floor levels of the crawl spaces
additionally he
The new slab is up against the new block on 3 walls, but on the 4th
wall the gravel and concrete slab are up against the wood of the old
house.
sounds like you got a a bright one there
so you are saying where the addition meets the house they poured
concrete and gravel against your wall and didnt even weather proof
wow
well it is too late now to do anything really
I hope they at least left the siding on the house where they
poured concrete and you arent saying they poured it against OSB
About the only think i can think of is go into the crawl space
with a few cans of undercoating that is used on cars
and spray the crap out of that wood
If not automotive under coating then try to find another good product
they should have at least installed some rubberized water and ice
barrier but really they should have matched the old sill level with the
new sill footer and used some rebar to tie them together.
anyway good luck
and if it is a problem
it wont happen for a couple years
>I am adding a new laundry room to the back of my house. The contractor
> had a footer poured and block installed around the new room. Then the
> area was filled with gravel.
> The current house has a crawl space under it adjacent to this new
> expansion.
> When they poured the concrete slab in this new room I noticed that it
> was 9" higher than the slab in the current crawl space.
> The new slab is up against the new block on 3 walls, but on the 4th
> wall the gravel and concrete slab are up against the wood of the old
> house.
> Is there a concern about this?
> There doesn't seem to be anything between the gravel and concrete and
> the house.
> TIA,
> Tim
>
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> had a footer poured and block installed around the new room. Then the
> area was filled with gravel.
> The current house has a crawl space under it adjacent to this new
> expansion.
> When they poured the concrete slab in this new room I noticed that it
> was 9" higher than the slab in the current crawl space.
> The new slab is up against the new block on 3 walls, but on the 4th
> wall the gravel and concrete slab are up against the wood of the old
> house.
> Is there a concern about this?
> There doesn't seem to be anything between the gravel and concrete and
> the house.