1 - INSPECTION FOR THE PREPARATION AND ORGANISATION OF THE SITE
First of all, the site’s suitability to receive all the materials involved in the installation of the access floor has to be inspected. The site should have the following adequate facilities:
2 - ALTIMETRICAL SURVEY AND TRACING
After the inspection, when required, the position of the panels is traced out. This operation, in agreement with the client, is very useful as it allows rapid installation and good esthetical results. The floor layout may be different every time, but some preliminary rules should be followed to obtain better final results.
3 - Installation
The floor installation has to be carried out in accordance with the above mentioned conditions. The slab in the room should be cleaned with a vacuum cleaner and painted with a layer of antidust paint, preferably polyurethanic or epossidic types (because they do not alter in the time). This procedure must be absolutely followed when the subfloor void is used as an air-supply/return duct.
There are various installation methods, depending on the experience of the installers and the floor type, in particular if it is with or without stringers. In order to have a reference point, such as an orthogonal axis system, two perpendicular nylon wires are fastened from wall to wall; to calculate their perpendicularity , the Pythagoras’ theorem, or simply 3, 4, 5 method (see fig.1) can be applied.
Point “0” of fig. 1 refers to the starting and reference point of pedestal and panel installation. Once the substructure has been installed, it has to be levelled. For this purpose several tools can be used: 15 metrelong spirit levels, laser levels, optical theodolite, or the more common 3 metre-long rigid levelling rods. Once the substructure has been installed, the panel installation can start too. It is advisable to start from the first row of internal panels along the two orthogonal axes. Make sure that there are not too small pieces of panel on the floor perimeter.
4 - Installation time
The installation time of raised access floor depends
on several factors:
5 - RECOMMENDATIONS
Keep free from obstructions all the access roads to the site where the raised floor will be installed, in order to permit the unloading of the materials near the access zones or the lifting machines.
Keep free from obstructions also the horizontal access to the site and to the lifting devices to the floors, in order to permit the easy movement of the materials with transpallet. Appropriate passages for the transpallet have to be arranged where the raised floor will be installed.
It is advisable to define contractually the characteristics and use programmes of the lifting devices for the vertical transport of materials.
6 - Storage on site
The material has to be stored in dry and protected areas, with temperature between 5°C and 35°C and relative humidity between 40% and 75%.
7 - Conditions of the rooms
The raised floor should be installed in rooms with
temperature between 5°C and 35°C and relative
humidity between 40% and 75%. The building
works should have been terminated not less than
30 days before the installation, damp works not less
than 15 days. External windows and doors have to
be already installed; the slab must be clean and flat.
The exact finished floor height must be explicitly
8 - Cleaning the site
The installation includes the removal of all remaining materials on a pallet next to the installed and cleaned floor; it excludes the transport to the base level of the building and the transport to the public dump. After the floor installation and cleaning, it is advisable to protect the floor covering surface with suitable materials in order to avoid impacts, scratches and abrasions during subsequent works. A suitable material is the MDF 2-3 mm thick, or a similar product
9 - HANDING OVER OF THE FLOOR
The raised floor is tested and handed over as soon as the installation is completed, before the application of protection materials (recommended),and other system installations.
10 - Final control
Procedure and acceptance criteria of the final control on site.
After the installation, the raised floor has to conform
to the following parameters:
Guide to the installation of raised floor
The following general instructions are valid before every raised floor installations.
1. Make sure that the slab is suitable to support the chosen substructure. Generally speaking, it can be said that the more regular the slab, the easier the installation and the better the final result.
2. Make sure that the room where the raised floor will be installed is free from remaining materials and perfectly clean.
3. Check that all brickworks have been completed some time before the installation in order to not have moisture.
4. Check that complementary installations, in particular the external frames, have been completed.
5. When required, verify that the slab has been treated with anti-dust primer.
6. Check the materials in order to determine if something is missing.
7. Determine the lowest and the highest point of the room so as to be able to calculate the height of the pedestals.
8. To reduce the possibility of mistakes it is advisable to start with an area not exceeding 100-200 m²; nevertheless, the quantity may vary according to installer’s experience.
9.Also for substructures with stringers it is sometimes
necessary to fasten the bases to the slab either
with glue or screw anchors, for example in the