EN
CEMENT-BONDED
PARTICLE BOARDS

CBPB FIXING

CBPB can be fixed to bearing constructions with the help of screws and special nails. All types of connecting elements must have corrosion-resistant coating.

Attention! Before CBPB mounting it is necessary to assure yourself that the elements of the frame are positioned vertically and horizontally. The elements of the frame must be in a single plane.

FIXING OF CBPB WITH NAILS

TO FASTEN THE PLATES IT IS NECESSARY TO USE GALVANIZED DRIVESCREWS FROM 2, 5 MM. NAILS DIMENSIONS ARE CHOSEN IN SUCH A WAY THAT A LENGTH OF A FIXED END WAS NOT LESS THAN TWO THICKNESSES OF A CBPB SHEET AND NOT LESS THAN 10 DIAMETERS OF A NAIL (SEE THE TABLE).

FIXING OF CBPB WITH SCREWS

PRELIMINARY IT IS RECOMMENDED TO BORE HOLES FOR SCREWS WITH COUNTERSUNK FOR THEIR HEADS (DIAMETER IS 1,2 BIGGER THAN DIAMETER OF A SCREW). IN CASE OF FASTENING PLATES WITHOUT PRIOR BORING OF HOLES ONE CAN USE ONLY SELF-DRILLING SCREWS WITH A HARDENED TIP AND COUNTERSUNK HEAD HAVING EDGES FOR COUNTERSUNK FOR ITS DIMENSIONS. TO FASTEN PLATES TO A CONSTRUCTION IT IS POSSIBLE TO USE SCREW INTENDED FOR GYPSUM PLASTERBOARDS.

Minimum dimension of nails and screws depending on CBPB thickness and a peg diameter

Diameter,
mm
CBPB thickness, mm
8 mm 10 mm 12 mm 16 mm 20 mm 24 mm 36 mm
2,5 35 35 40 50 - - -
3 40 40 45 50 60 - -
3,5 - 45 50 55 60 75 -
4 - - - 60 60 75 110
4,5 - - - 65 65 75 110
5 - - - 70 70 75 110
5,5 - - - - 75 80 110
6 - - - - - 85 110

To guarantee technologically correct fixing of CBPB it is necessary to ensure a gap between fixing elements and plates edges.

Plate thickness,
mm
Distance, mm
From edge,
a (min.)
Along end ribs,
b (max.)
Along middle ribs,
c (max.)
8, 10, 12 20 200 400
16 25 300 600
20 25 300 600
24 25 400 800
36 40 600 1200

CBPB fixing to a frame

1 — wooden timber; 2 CBPB; 3 steel post; 4 screw; d screw length

Notice: when using usual screws the holes for them are bored having the size equals 1,2 of the screw diameter; it is recommended to make a cavity for a flat head.

JOINTS

CBPB AMAK as any other material made of wood shrink and expand when humidity changes. That is why big quantity of joints (small size of plates) leads to a light shift of plates, and a small amount of joints (big size of plates) to a bigger shift. Shifts are suspended by means of fastening the plates inside the joints. During long-term tests of the plates the trends to plates shrinkage became visible, which needs to be considered thoroughly when doing closed joints. To prevent crack formation in construction mixtures for sealing of joints, a width of a closed visible compensation joint must be 8 mm for exterior use and 4 mm for interior.The most reliable and simple decision concerning assembly, technical and aesthetic point of view is exposed visible compensation joint with a width 4-8 mm.

Attention! Cement-bonded particle boards are delivered from the plant having humidity 9+3 %. Plates must be protected from moisture before assembly.

EDGES AND JOINTS

WHEN CHOOSING A WAY OF EDGES AND JOINTS ENGINEERING ONE SHOULD BEAR IN MIND EXTERIOR AND INTERIOR CLIMATE AND ESPECIALLY MOISTURE. POSSIBLE WAYS OF EDGES AND JOINTS ENGINEERING ARE NUMEROUS. THE MOST PREVAILING ONES SEE BELOW.

Variants of joints between CBPB

1 a band of hydraulic isolating material; 2 elastic seal (sealer)


1) Open joint (fixing with a screw)

2) Open joint (fixing with a nail)

3) Closed joint (fixing with a screw)

4) Closed joint (fixing with a nail)

5) Fixing with the help of aluminum lath

6) Fixing with the help of use of a coverstrip
SEE ALSO
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