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    June 2021
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    Joining cladding boards with tongue and groove

    Joining cladding boards with a tongue and groove is also a common method.

    Drawing. Carpet board joints with a tongue and groove: a) Face joint with a convex rectangular groove, b) Face joint with a convex trapezoidal groove, c) butt joint without convex, d) butt joint with a raised triangular groove

    The keys and projections can be freely designed, to your liking and execution possibilities (drawings).

    Drawing. Other types of self-tapping connectors for your pen: a) expanded groove bottom, b) chamfering of the triangular groove at an angle of 45 °, c) shallow triangular groove.

    Drawing. Various sections of the lining boards: a) arched concave profile, b) arched convex profile, c) triangular profile cut on both sides (10°).

    Milling profiles is more difficult than in the method of joining with a foreign tongue, due to their differences on both sides of the boards. For this purpose, you will need the appropriate profile cutters. In extreme cases, in the absence of suitable cutters, each side surface of the board must be processed at least twice.

    The tongue and groove joints can be used in horizontal cladding, external, however, with the groove at the bottom and the groove at the top of the board, that no water can get into them.

    Drawing. The method of horizontal laying of boards connected with a tongue and groove: a) normal, water runs down the carpet, b) incorrect, water flows into the inlet

    Technological process of lining cladding made of tongue and groove boards, i.e.. milling, grinding along the grain, rounding the edges with sandpaper, varnishing and nailing do not differ significantly from lining facings joined with a foreign tongue.

    Profiled side surfaces of the boards (keys and splines) It is recommended to cover 1 or 2 layers of varnish more than the front surfaces, intended for external facings. It is because of this, that during varnishing they are in a vertical position and it is more difficult to apply the same amount of varnish on them as on the frontal plane in a horizontal position.

    During assembly, we never tap the boards directly with a hammer, but through the washer. The board on the groove side can be tapped with a flat pad made of a hardwood slat, and from the tongue side through a profiled washer (drawing).

    Drawing. A profiled pad when tapping the boards during assembly.

    A flat washer in this case may damage or break off the tab.

    Joining boards with an overlap in horizontal claddings is less common, because it cannot be hidden when mounting the nail heads (drawing).

    Drawing. Methods of lining external walls with horizontal boards joined with notches: a) butt joint (there is a risk of water penetrating into the joint gap), b) a rebate joint with a convex groove as a gutter for water drainage, c) a groove joint with obliquely milled boards, d) tile laying of boards (on the tab).

    This method of joining can only be used on larger planes, e.g.. cladding of external walls of recreational houses, gables and attics at higher heights, etc.. However, as long as our production capabilities allow us to do so, even here we should avoid exposed nails.

    Even time-consuming screwing of decorative boards, brass screws don't make up for losing sight of pure wood.

    The cladding boards at the corner joints are cut diagonally like this, so that planes with cross-cut grains are never visible. A tool can be prepared for making oblique cuts. It will be used for precision, at the same angle of sawing boards with a handsaw or a circular saw. For manual, at an angle, The miter box is used to cut boards, which must be Fr. 20 mm higher than the board width. Corner condition, joining the boards diagonally is the same width (or at least one layer).


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