Machining, fixing, jointing, bonding and finishing of the BETONWOOD
4.1 MACHINING OF BETONWOOD
4.11 Basic principles of machining
Machining of BETONYP building board requires the use of carbide tipped
tools. Traditional (iron, chrome-vanadium) hand-held tools can also be
used for machining, however, the tool wear will increase in this case.
use of metallurgical tools-metal saws, metal borers-also facilitates
manual processing. It is recommended to provide for dust exhaustion of
appropriate efficiency, when machining BETONYP building boards.
min. exhaustion speed should be 30 m/s.
4.12 Recommendations for major operations using hand-held electric and
4.121 Cutting-of and cutting to size
recommended to use carbide tipped saws. The cutting depth shall be
adjusted so that the saw blade protrudes only slightly (3-8 mm) from the
BETONYP building board. Favourable edge quality, improved edge
durability and low cutting resistance can be obtained by the use of
carbide tipped saw blades. The “A” and straight tooth types are arranged
alternately. Saw blades with other shape can also be used, the edge
durability edge, however, be reduced.
= 4500 min-1 = 75 s-1)
4.122 Groove cutting and mortising
recommended to use carbide tipped ripsaws. (v = 1,5-6 mm).
= 5300 min-1 = 88 s-1)
4.123 Circular and other offcuts
Electric compass saw can be used for cutting holes with a diameter
larger than 30 mm as well as for cutting various forms and for angular
= 1600 strokes/min).
High-speed steel or-in series production-carbide tipped borers are
recommended to use for this operation (nmin = 400 W; nmin = 1200 Min-1 =
higher the r.p.m. of the boring machine, the cleaner bores can be
obtained. It is recommended to use hardwood counterpiece on the exit
side of the borer. Feed rate should be maintened at low value.
Recommended type of carbide tipped borers:
· From 1,5 to 16 mm diameter: helical drill with 60°C cone angle
· From 8 to 16 mm diameter: mortiser with guide tip and scoring edge
· From 16 to 40 mm diameter: hinge borers with tuide tip and cutting edges
Borers with diameter from 1,5 to 16 mm can be provided with counter
sinking fixtures having carbide tipped cutting edge.
recommended to use carbide tipped cutters for this operation , too.
Cutter sets with reversible blades ensure quick tool replacement and
= 22000 min-1 = 367 s-1)
Uneveness in joint can be elimanated by sanding. Recommended grit size
of the sanding paper: 60-80. Appropriate cutting depth can be achieved
only by the use of belt sanders. Dust exhaustion should be provided
under any circumstances.
4500 min-1 = 75 s-1).
4.127 Nailing, clamping
mechanically prebored BETONYP building boards can be nailed using manual
methods. Their fixing to natural wood material can be carried out
efficiently by means of mechanical nailers and pneumatic clampers with
automatic feed. The wood-board joint can be improved significantly by
the use of spiral nail.
series production the BETONYP building boards can be screwed to ribs
using pneumatic or electric screw-driving machines. When assembling
structures, screw with two-start thread can be used most efficiently.
FIXING OF THE BETONYP BUILDING BOARDS
cement-bonded chipboards can be fixed by pneumatic and manual nailing,
spiral nailing, screwing and pneumatic clamping.
fixing the cement-bonded chipboards, they have to be placed on the frame
fixing distances at corners are to be selected so that excessive
weakening of cross-section may not occur.
is recommended to apply screwen fixing for boards with more than 16
is required to use plated/corrosion resistant/fasteners and
fittings/zinc-plated, cadmiated etc./
- Proper support of boards should be provided during fixing for any
FORMING OF JOINTS
designing BETONYP structures, the following recommendations should be
considered in connection with making extension:
- Dimensional change of the building component depending on
- Dimensional changes depending on moisture content
- Movement of load bearing structure
- External effects, loads (wind pressure, vibration, etc.)
- Fasteners (type, size, quantity etc.)
wide range of extensions can be made with BETONYP boards by various edge
Before the selection and the application of an adhesive for BETONYP
boards it is highly recommended to ask for technical information at the
supplier of the adhesive.
4.5 FINISHING, PAINTING
When finishing BETONYP building boards, the following properties of
board should be considered:
to its considerable cement content, the board shows alkaline
reaction (similarly to concrete)
boards surface is smooth and quite high absorbent
moisture content of board should not exceed 14%.
the alkaline of board, either alkaline resistant materials should be
used for finishing BETONWOOD boards or alkaline resistant prime coat
should be applied to the boards.
Purpose of priming:
reduce surface alkalinity
make absorbance uniform
decrease moisture adsorption
called “deep primers” resistant to alkalis (that do not show
saponification on the surface) can be used for this purpose.
Before the application of the finishing materials it is highly
recommended to ask for technical information at their suppliers.
Repair of minor damages of the board:
prime the damaged part together with the other parts of the surface,
then fill the gap using DEKO putty. Once dried, align the puttied part
with the sound parts of the surface by sanding.
paint BETONYP building boards it is recommended to use complete coating
systems developed by various paint manufacturing companies.
Wall-papering is a generally recommended surface finishing method for
preparation: Finishing of joint gaps or
repair of possible surface defects by gypsum plastering (Breplasta). To
compensate for the possible slight movement of structure, elastic
polystyrene foam board or gypsum plasterboard is placed under the
wall-paper. This sliding layer gives a surface ready for final surface
papering with polystyrene underlay: The wallpaper underlay is
available in panel sizes. Make sure that the vertical strips are
jointles. The edge-to-edge joint should not coincide with the panel
joint and should preferably be free of gap.
apply adhesive uniformly to the wall surface to be papered (by means of
brush and distributing comb), then to the wall-paper underlay. Surfaces
prepared this way should be left drying for about 10 min. A 3-4 m2 area of wall surface is recommended to be papered simultaneously.
The wall-paper underlay can be applied to the wall
surface by means of TEDDY roller so that the air enclosed between
layers is squeezed out, when moving the roller in one direction.
- Wall-papering with gypsum plasterboard: The gypsum plasterboard is
available in panel form, which should be cut to size accurately
prior to placing. The panel is to be fixed by screwing, starting at
the centre and proceeding downwards. The panel should be fixed on
its periphery and centre line alike to the panel ribs, making sure
that the juncture of panel joint and gypsum plasterboard is in ofset
position. Full threaded chipboard screw of min. 35 mm lenght is to
be used. The fixing distance is max. 200 mm and min. 15 mm from the
board edge. The gap formed between screwed-on panels should be
filled with gap-filling gypsum. The location of screw-heads is to be
masked by gypsum plastering.
wall-papering technology used for surfaces prepared this way is similar
to that applied for traditional wall surfaces.
For light wall-papers with overlapped joint, the
wall-paper can be applied directly to the foam board without surface
justifying. Special wall-papers and claddings can be bonded with
water-based dispersion adhesive. Particular care should be taken, when
wall-papering vertical wall corners. Do not take over the wall-papers
continuously to the neighbouring wall surfaces. Here the wall-papers
should be jointed by leaving slight overlaps and bonding only one of the
It is recommended to perform wall-papering prior to
locating the cover fillets and skirting boards, because it facilitates
jointing of wall-paper borders at the horizontal edges and at the
skirtings of doors and windows.
Important: The adhesive, putty, paint used for PS foam board may not contain
4.7 CLADDINGS FOR
“ROOMS EXPOSED TO WET CONDITIONS”
4.7.1 PVC cladding systems
The cladding systems are suitable for making
jointless, high resilint claddings in “rooms exposed to wet
conditions”/toilet, bathroom, lavatory/ and on wall surfaces above
uneveness of socle and floor slab under the flooring board should be
eliminated. The following socle finishing materials can be used for
ground-floor rooms: polymer mortar, self-spreading floor mass.
surface defects in panels under the wall-cladding material can be
repaired with DEKO putty.
- First the floor covering should be prepared. The flooring material
laid free of gap should be welded together at the joints.
Water-tight, trough-like layer should be formed by felding the floor
covering to the vertical wall surfaces in min. 10 cm height. Special
care should be taken, when welding the corners.
wall cladding should be bonded free of gap by cutting it so that the
wall cladding material 5 cm overlaps the folded edges of the floor
covering formed in a trough-like fashion. Thus it can be ensured
that no utility water enters the panel structure of the building.
Bonding of PVC coverings is recommended to be performed by
Tiles form a stiff layer on the
wall surface (or on the floor), therefore, the following instructions
should be observed, when covering with tiles:
recommended to design an extraordinary solid load-bearing structure
(solid frame building, regular fixing of boards). The movement of
load-bearing structure might cause splitting or even breaking of tiles.
The tiles should be applied in a netted structure, leaving min. 3 mm gap
between tiles. Similarly, when forming corners, min. 3 mm gap is
At corners joints, only permanently elastic material is permitted to be
used for filling the gaps (Silicon or Acrylpaste). It is important to
take into consideration that silicon type filling materials can not be
coloured or painted afterwards. Therefore using silicon filling
material, coloured type should be applied. Acryl pastes can be
Specially at bigger wall facing an elastic material has to be placed
between the BETONYP boards and tiles in order that to form a sliding
layer. This layer can be a polystyrene foam board to instructions (PS
board by bonding, gypsum board by screwing).
Tiling can be made on this surfaces. When bonding the tiles on, the
adhesive supplier’s instructions must be followed.
If the flooring of the room exposed to wet conditions in the roof space
is also made of ceramics – especially if BETONYP floor is placed between
the ground-floor and the loft - , reliable water proofing should be
This insulation can be
renderset (BITUGEL) and bonded (bitumen + bituminous boards).
The insulation should be made by
folding it to the side walls by min. 10 cm.
BITUGEL should be used to bond
the ceramic covering to the insulation prepared this way.
At the corners elastic material
should be used for filling the gaps.
5. Basic principles of the
previous chapters gave an introduction to the application, the physical
properties, and the main features of the BETONYP building boards.
Obviously the BETONYP building boards can be used in several area of the
BETONWOOD. and its predecessors
also used to produce plane boards, differently processed board products,
and to manufacture and distribute products, constructions and elements
for so called complete loading systems. For now this later activity has
been ceased on the one hand because of an intention for clearing the
company’s profile and on the other hand because of the complicated
constructions of boarding systems and the complexity of customer
response and serving the client’s demands on a standard of our days.
Our intention was that the
development, design, manufacturing, and distribution of constructions
can be formed by using BETONYP building boards are to be accomplished by
professional contractors specialised on this kind of activities
providing our customers with the highest competence and expertise.
In spite of these events, during
those years which were dedicated to introduce the BETONYP building
boards into the market and to get them accepted by both the domestic and
foreign customers in building industry, BETONWOOD and its
predecessors have gained significant experience and expertise in
connection with the application of the building boards. Therefore now we
can publish some basic feature and possible purposes for the application
of the product in order that our clients can derive benefit from them
during the application of our board products.
It is essential that BETONYP building board is a basic commodity
produced for the building industry similarly to the brick or cement.
Therefore it is very important to accentuate again that any product or
construction applying BETONYP building boards has to be designed taking
customer requirements into account previously.
the design process the physical, mechanical, fire resistance and
airborne sound insulation properties of building boards must be taken