PROTECTIVE SHEET, IN PARTICULAR FOR A FOUNDATION WALL OR A FLOOR ON THE GROUND

FEUILLE PROTECTRICE, NOTAMMENT POUR MUR DE FONDATION OU PLANCHER EN CONTACT AVEC LE SOL

English Abstract

ABSTRACT OF THE DISCLOSURE
The invention relates to a protective sheet, in
particular for a foundation wall or a floor on the ground,
said sheet being made of a relatively stiff plastics
material. A large number of spaced knobs protrude from
one side of the sheet, whereby the other side obtains a
corresponding number of recesses. The knobs have a
centrally disposed crater-like portion, the narrowest end
of which is flush with the other side of the sheet.
Between adjacent recesses there is arranged an open channel
provided through forming such that on the said one side of
the sheet there appears a corresponding ridge between the
knobs. Externally of the other side of the sheet there may
be arranged a filtrating canvas co-acting with said channels.

Claims

The embodiments of the invention in which an
exclusive property or privilege is claimed are defined
as follows:
1. A protective sheet, in particular for a
foundation wall or a floor on the ground, comprising a
substantially planar sheet of suitable, relatively stiff
plastic material, one side of the sheet having a large
number of spaced protrusions constituted by knobs pro-
vided by forming, the other side of the sheet thereby
obtaining a corresponding number of recesses provided
by said forming, characterized in that the knobs have a
reversely directed centrally disposed crater-like portion
of truncated conical form, the widest end of which is
integral with the upper portion of the knob and the
narrowest end of which is substantially flush with the
other side of the sheet.
2. A protective sheet as claimed in claim 1
including open channels, there is provided through forming
in such a manner that on the one side of the sheet there
appears a corresponding rib with a height less than the
height of the knobs, characterized in that each of the
open channels extends between and has respective ends
opening into the recesses of adjacent knobs.
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Description

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The present invention relates to a protective shee-t, in
particular for a foundation wall or a floor on the ground,
comprising a substantially planar sheet or suitable, relative-
ly stiff material, e.g. plastics, where one side of the sheet
has a large number of spaced protrusions constituted by knobs
made by forming, whereby the o-ther side of -the sheet thereby
obtains a corresponding number of recesses provided by said
forming. Such a sheet is known, for example, from DE-A-26406~5
and DE-A-3006820.
The known so-called foundation wall sheets are presently
used extensively as a covering of the foundation wall before
fill masses are piaced thereat. Where access to draining fill
masses is poor, it is frequently an expressed wish to ensure
that the water pressure against the foundation wall becomes
-the least possible. Such additional drainage is not always
that easy to provide by means of the known foundation wall
sheets having knobs. Further, it may in certain cases be
desirable to provide the foundation wall shee-t with knobs
which do not quite so easily yield due to external forces
from e.g. the fill mass. Recently it has also been common to
use these foundation wall sheets as a diffusion bar for a
floor on the ground. With the prior art solutions~ it is,
however necessary to provide spacing means to space the floor
from the moisture bar, in order to provide sufEicien-t ventila-
tion or drainage under the floor. This is particularly
important in the cases where a floor made e.g. from chip
boards is used.
Thlls, the present invention has as an object to provide a
protective sheet providing a solution to the indicated draw-
backs. The present invention provides a protective sheet, in
particular for a foundation wall or a floor on -the yround,
comprising a substantially planar sheet of suitable, relatively
stiff plastic material, one side of the sheet having a large
number of spaced protrusions constituted by knobs provided by
forming, the o~her side of the sheet thereby obtaining a
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corresponding number of :recesses provided by the forming,
charac-terized in -that the knobs have a reversely directed
centrally disposed craler-like portion of truncated conical
form, the widest end of which is in-tegral with the upper por-
tion of the knob and -the narrowest end of which is substanti-
ally flush with the other side of -the sheet.
In a preferred embodiment open channels are provided for
drainage of fil-trated water. A corresponding rib is forrrled
on one side of the sheet with a height less -than the height
of the knobs, characterized in that each of the open channels
extends between and has respective ends opening into the re-
cesses of adjacent knobs.
Further features of the invention will appear from the
subsequen-t description with reference to the attached drawings.
Fig.l is a section of a protective sheet according to the
invention.
Fig~2 is the cross-section II-II in Fig.l.
Fig.3 is the cross-section of Fig.2 related -to a filtrat-
ing canvas.
Fig.4 illustrates the use o. the protective sheet in a
manner known per se.
Fig.5 illustrates the use of the protective sheet in con-
nection with a filtrating canvas.
Fig.6 illustrates the use of -the protective shee-t as a
moist bar for a floor on the ground.
In Fiy.l there is shown a protective shee-t, e.g. of rela-
t:ively stiff plastics which may possibly before use be present
in a rolled-up form. As indicated in Fig.2, knobs 2 protrude
from the one side lA of the sheet, said knobs having a cen-tral-
ly arranged crater-like portion 3 and where the bottom of ~he
crater 3A is flush with the other side lB of the sheet.
Between the recesses 2A provided by the forming of the knobs
2, there is on the other side 1~ of the sheet provided an open
channel 9. On said one side lA of the sheet there is thus a

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corresponding rib or ridge. The sald channels 4 will, as
regards a vertically disposed protective sheet, extend
between adjacent recesses 2A being arranged vertically above
each other.
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llowever, there is nothing agairlst the knobs being arrarlged
i,n a different manner than that il,lustrated in Fig. 1.
Thus, the knobs of one row of knobs could be shifted rela-
tive to the knobs in -the adjacent rows of knobs.
In -the cases where the protective sheet is to be
arranged in an environment having masses providing poor
drai,nage, it may be an advantage to arrange a ~iltratin~
canvas 5 on the said other side lB of the sheet.
In Fig. 4 there is shown a first mode of use for
the protective sheet 1, where it is arranged in a tradition-
al manner with the knobs facing a foundation wall 7. Fill
mass 6, e.g. broken stone or other mass having good drainage
property is placed against the other side of the sheet.
This draining mass may cause a substantial pressure against
the sheet, wherefore the crater-like portion of the knob
will effect a stiffening of the knob itself and ensure -the
necessary distance between the protective sheet and the
foundation wall. The channel 4 will in addition effect
further drainage along the other side lB of the sheet,
wherefore the water pressure against the sheet is reduced.
In Fig. 5, the mass 8 is in the form of mass having
poor drainage capability, e.g. clay or fill mass containing
earth. In this case it is desirable to arrange the fil-tr-
ation canvas externally of the other side of the sheet,
whereby water being filtrated through the canvas escapes
via the channels 4.
The filtrating canvas 5 prevents the channels ~
from being blocked by the mass 8. In this connection the
crater-like portion 3 of the knob 2 will effect further
support of the canvas 5 and prevent it from being pressed
into the recess 2A.
In Fig. 6 there is shown a protective sheet 1
intended as moist bar for a floor 9, e.g. a floor made
from plates of wood chippings. Sheet 1 is arranged on a
cast layer 10 on the ground (not shown). The channels 4

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will in this case contribute to a certain ventilation
between the floor plate 9 and the protecti~e sheet 1.
Further, the crater-like portion 3 of -the knob 2 upon
heavy point loads on the floor 9 contribute to the knob
better withstanding such deforming forces.
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