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<p>[QUOTE=&quot;Phil Douglas, post: 2949608, member: 13223&quot;]A friend gave me some jarrah floorboards that had been used as a trapdoor in his 1890&#039;s Adelaide (Australia) house. He said that he thought the boards came from that period, they had been the original floorboards in the house. I was intrigued by the grooves that they had on the underside, which are apparently there to stop the nails pushing splinters into the space between the board and the subfloor which it is nailed down to. These splinters can cause squeaky floors (<a href="https://www.woodmagazine.com/wood-supplies/lumber/why-do-hardwood-flooring-planks-have-grooves" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.woodmagazine.com/wood-supplies/lumber/why-do-hardwood-flooring-planks-have-grooves" rel="nofollow">https://www.woodmagazine.com/wood-supplies/lumber/why-do-hardwood-flooring-planks-have-grooves</a>).</p><p><br /></p><p>The boards had three distinct patterns of groove: a single central vee shaped one, two equidistant vees, and a shallow segment of a circle (see my drawing below). I was wondering if the pattern of grooves indicates a date.</p><p><br /></p><p>I have been impressed by the eclectic erudition of responses to many weird and wonderful questions here. Does someone have experience of this sort of thing?</p><p><br /></p><p>[ATTACH=full]287478[/ATTACH][/QUOTE]</p><p><br /></p>

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