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Appendix of INSTRUCTIONS FOR THE STRUCTURAL PREPARATION OF GARDEN
SWIMMING POOLS
Introduction
A properly compacted soil surface is sufficient as a base under the ORLANDO swimming
pool, as described in the Instructions for the Structural Preparation for Garden
Swimming Pools. Concrete bottom slab is an alternative that allows a higher level of flat-
ness and hardness of the bottom of the pool. However, it is necessary to realize that this will
make the construction of the swimming pool more expensive.
Generally speaking, a concrete slab is not necessary for the construction of the ORLANDO
swimming pool. However, it is necessary to fill the concrete around the wall of the pool in
order to ensure the stability of the construction of the pool after sinking it into the ground
(see the Instructions for the Structural Preparation for Garden Swimming Pools).
Description
The concrete bottom slab should be approximately 15 cm thick, made of C16/20 concrete
mix (formerly B20), reinforced with a concrete KARI net (mesh 15 x 15 cm with a reinforce-
ment diameter of 6 - 8 mm).
Preparatory work
Follow Instructions for the Structural Preparation for Garden Swimming Pools for site selec-
tion and substrate preparation. In case of doubt about the bearing capacity of the subsoil or the
hydrogeological conditions, we recommend professional structural engineer assessment.
It is also important to determine the basic (zero) level of the construction, i.e. the height to which
the spot elevations of all the adjustments related to the installation of the pool will be related.
The excavation and pool area must be constructed according to the site dimensioned drawings
for the particular pool model. These dimensions are given in the Instructions for the Structu-
ral Preparation for Garden Swimming Pools. For clarity, they are also simplified in the table
in Drawing 1. These dimensions also apply to the above-ground version of the pool without
sinking it into the ground.
Construction work - concreting
Depending on the quality of the subsoil, it is possible to reinforce the bottom with gravel
sub-base that is 50 mm thick. Gravel bed is not needed on solid, firm terrain.
Subsequently, the slab of the bottom is concreted with 15 cm thick C16 / 20 concrete
(formerly B20) with KARI net reinforcement at the top edge of the slab (see Drawing 2). It is
important that the KARI net reinforces the entire surface of the slab to the edge, including
the area for placing the inclined struts.
The surface of the slab must be perfectly horizontal and smoothed with a steel trowel.
Further work is possible only after the reinforced concrete slab has hardened, i.e. after at
least 7 days.
Mounting recommendations
Oval swimming pools are equipped with transverse steel strips, which are laid on the bottom
of the pool. These steel strips are essential structural components of oval swimming pools. To
prevent these strips from being visible under the pool foil, it is recommended to cover the slab
Basic Requirements for Making a Concrete Slab
for ORLANDO / ORLANDO PREMIUM Garden Swimming Pools
DRAWINGS
Important note:
First carefully read the Instructions for the Structural Preparation for Garden Swimming Pools and follow
the instructions. This appendix describes a variant of the concrete bottom slab under the swimming pool.
All other parts of the swimming pool installation described in the Instructions remain valid.
Swimming pool Dimensio
Circular
Oval
R
180 cm
230 cm
275 cm
183 cm
S (min)
195 cm
245 cm
290 cm
200 cm
L
-
-
-
91,5 cm
P
-
-
-
60 cm
W
-
-
-
300 cm
Key:
P, W imensions of the
inclined struts
area
L
distance of the
centre of the se-
micircle from the
transverse axis of
the pool
R
radius of the pool
(front)
S
radius of the foot
of the excavation
(slab)
Key:
1 foot of the excavation
2 gravel sub-base, 5 cm thick
3 concrete slab, 15 cm thick
4 slab reinforcement, KARI net Ø 6 mm
or Ø 8 mm, mesh 15 x 15 cm
5 geotextile mat
6 bottom rail
7 foil and wall of the pool
8 studded membrane
9 concrete fill (after filling the pool with water)
Drawing 1, ground plan of the slab
Drawing 2, side cross-section of the slab and fill
Note: The dimensions are in centimetres..
Note: The P dimension is reduced in comparison with the data in the Instructions for the
Structural Preparation for Garden Swimming Pools so that there is a space of approxima-
tely 30 cm on the outside of the outside inclined struts.
inside the swimming pool with a maximum of 2 cm thick fine sifted sand after installing the
pool construction and before installing the geotextile mat and foil. Have the sand ready.
