If the size of boards required corresponds to the standard sizes available in your DIY store, planks that have the tongue and groove cut in them from stock are a useful and a quick way of making up wide boards. Standard sizes of ^ x 5in (18 x 127mm) and \ x 6in (18 x 152mm) are widely available and usually sold for floorboarding. Some are also available at 3/sin (9mm) thick and are sold as cladding. The tongue is shorter than the depth of the groove so that the joint will not have a gap when the two parts are pushed together, as would be the case if the tongue were longer. Simply glue up and clamp lightly.
Cutting the tongue and groove with a router will make a good strong joint, but careful setting up is required - and there are better ways of jointing two planks (see above).
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