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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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