David wrote:I could wish that you had built the deck in the way that I originally envisaged, with longitudinal deck beams and closely spaced stringers (Gougeon Brothers pp 260 - 262), not laminated deck beams, and with single layer ply, longitudinally orientated, on the planar side decks and double layer ply on the curved centre of the deck. You would have found it much quicker and easier to build, and just as strong. But it's all done now, and the final result will be very serviceable.
You decided against the extended "eyebrow" above the companionway, and that's fine, but it will still be good to incorporate some form of drip rail here, so that water doesn't migrate along the underside of the deck. Look at the underside of a windowsill on a house, and you will generally find one or two grooves, to disrupt that migration path.
I did actually more or less follow the Gougeon Bros advice and they do use beams as well as stringers, ie a grid pattern. The reason for the thickness of the material was to assist in attaching the deck liner. The plans that you gave me - you may have revised the deck structure since designing the smaller Sib-Lim only gave me two large stringers. This wouldn't have given me sufficient wood to fasten the plywood to, or for the panels to achieve the desired shape. I added extra stringers, if you recall, but even so, I had to add another couple for the deck between the bilgeboard cases, because the plywood naturally created a hollow. I also like that fact that the way my deck has turned out looks like one constant camber rather than two flats and a curve.
Surprisingly, it was very difficult to bend the 6mm ply in the bilgeboard area - it was much easier to get it to sit nicely using the longer sheets, hence the extra, extra stringers mentioned above.
I am probably going to finish both the forward and after ends of the deck as we did on Badger. At the companionway there will be a small timber for the acrylic to rest against and I suspect that will make an effective drip rail However, the water can only go as far as the little fore and aft bulkheads because of the deck beam. Don't know nuffink about houses and window sills, but I do know about leaky companionways!!
By the way - the Gougeon Bros do not use butt blocks, they scarf on their dainty beams. I felt quite happy to butt on my wider beams. The second layer of ply makes for a good butt block!