Waterproof joints between timbers

(19)

(11)

EP 1 031 673 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	23.10.2002 Bulletin 2002/43

(43)	Date of publication A2:
	30.08.2000 Bulletin 2000/35

(21)	Application number: 00301568.2

(22)	Date of filing: 28.02.2000

(51)	International Patent Classification (IPC)⁷: E04B 2/70, E04C 2/12

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(71)	Applicant: Lindal, Sir, Walter
	Seattle, Washington 98101 (US)

(72)	Inventor:
	Lindal, Sir, Walter Seattle, Washington 98101 (US)

(74)	Representative: Everitt, Christopher James Wilders et al
	fJ CLEVELAND 40/43 Chancery Lane London WC2A 1JQ London WC2A 1JQ (GB)

(54)	Waterproof joints between timbers

(57) A waterproof joint system between tongue and groove wood planks sawn to bisect the heart of the small log they were made from. These planks are then planed into Greenwood planks, which will have exposed hearts on one side. Greenwood planks with hearts exposed will warp or cup as they dry with the cupping being away from the heart side. The green planks are interlocked together to form a wall or roof panel so that the heart side of the planks alternate from one side of the panel to the other. They are tied together by a series of cross ties nailed to each plank. Held tightly together the tongues will be forcefully squeezed against the sides of the grooves as the planks cup, producing a watertight joint. If the planks or logs are laid horizontally like with a log cabin, the cross ties will prevent the logs from settling, or newly designed long wood screws can be used as cross ties, which will also prevent settling and, unlike the cross ties, will be hidden in the wall.

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