hi folks first post. i've read a lot of the posts here about wood movement and understand that this needs to be taken into account especially in respect to the width aspect. i have a question on how much spacing is recommended between seat slats on a garden bench. the plans are online at
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have all the wood cut, and when i did a trial fitting i found it more aesthetically pleasing with the seat slats positioned tight together. the design recommends a 1cm gap. the plans use 2x4 inch unspecified exterior wood, i chose 6x1.5 inch mahogany (couldn't get
2x4). the climate is dublin = generally mild, not too hot, or cold, or humid. the reason i ask is because the instructions with the plans are just to nail the planks in to the perpendicular seat supports. surely this wouldn't be great for tolerating wood movement? i.e. if the wood gets wider with humidity, it will be pulling the nails out sideways. i intend to use three 100mm screws to give extra strength to fixing the planks to the seat supports, since the piece will be extremely heavy and people will invariably try and lift/move the bench by the slats. i wouldn't trust nails to hold it together well over time. since i've spent a few quid on the wood, there's no point risking damage to the wood just because it would look nice to have the boards together. but i'm wondering what's the expert opinion? on other benches, i sometimes found a 1cm gap slightly uncomfortable for sitting on for long-ish periods of time, especially on the back if it's sunny, no t-shirt etc., aesthetically (and for comfort) i would prefer no gap, but then as necessary i would hope for a smaller gap than the recommended 1cm. any ideas? not using any glue or anything, just bolts for the stress points, and screws to fix the slats. my main worry is that even putting 3 screws down across a 6 inch board could be too restrictive for the wood movement, but i have no hands-on experience with it so don't know if i'm making too big a deal out of it.
many thanks in advance. tim