Any constructive feedback is more than welcome, as said, this is my first instructable and English isn't my native language.
Here in Holland, and probably around the globe, real Teak wood is becoming more and more expensive. For the average boat-owner with a tendency for the DIY (you wouldn't be on instructables otherwise would you?) there are alternatives however!
I first looked at the 'plastic' teak look-a-like, you'll get tons of hits googling for 'fake teak'. This still isn't cheap however, if you do all the measuring and applicating yourself, the price is still nearing the $1000 mark for the surface area shown in this instructable. It does have the distinct advantage of being lower-maintenance than any wood solution, but i feel it lacks that genuine feel you can only get with real wood.
So the obvious choice for me was to see if i could find another solution using just the tools available to me, i ended up using:
- Rotary router
- Routing bits (3 pieces, explained later)
- Power saw
- Sanding paper in different corseness
- Woodworking pencil
- Guide (long ruler or straight piece of wood)
- Tape measure
Apart from the router this should be available to everybody by looking in the garage. Routers aren't cheap, i borrowed mine from my father, and i would advise borrowing a more expensive model rather than buying a cheap one. Cheap routers can be a pain to work with, but it's up to you.
For the materials i ended up using 15mm waterproof plywood. I don't know how to translate this to english, but we call it 'watervast verlijmd multiplex', there are different wood-types available, i choose Ocoume, because it has a very nice wood-grain.
On the next page we'll get into the measuring and drawing part, where it gets interesting!
Step 1: Measuring, Measuring and Drawing
I first took the sheets and cut the outlines i measured in the boat, using some of the old decking, the more intricate bends were traced. This comes down to just being precise and carefully think it all over before you actually start cutting.
Before you can actually start drawing the outline to be cut you have to make a plan as to which sheet goes where, the most important thing here is to remember the direction of the grain of the wooden sheets! With plywood the grain runs lengthwise, you will want to route along the grain most of the time (lengthwise). When trying to figure out how to place the sheets, keep this in mind.
When you have rough-cut the sheets, start to test the fitment in the boat, this might take a couple of tries, but you better be carefull, removing excess wood is easier than adding it when you cut too much. In my case all but one sheet were dead-on, the final sheet had to be trimmed a little due to the boat not being perfectly symmetrical. No boat is, so keep that in mind!
When the boards fit exactly as they should, we are ready to draw the outlines for routing!
As i want to show with the example photo of teak decking, real teak is comprised of separate planks, so that's the look we want to achieve from our solid board. To do this, choose a size for the 'outer' plank, this plank runs across the entire outline of the deck, at least in a real teak deck. For my deck i chose 7cm wide. Also choose a size for the inner planks, again, i opted for 7cm, but you can pick any size you want, as long as you make it consistent in the entire deck!
I drew the plans for the placement of the boards and outlines as a sketch in my notepad and then transferred them to a nicer sketch on the computer, use this as a reference! (Wouldn't it be nice to have a sheet-size portal CNC router...). I have those documents on another pc, i'll add them just for reference.
Now pick up your guide and trace the first outline around the entire deck (not neccesarily the outline of each board, the outline of the deck can be a totally different thing!) using the first size you decided upon. See the attached image for reference.
When you have that outline, determine where you want any hatches to be, these should never cross into the outline 'plank'. It might help to keep the next step in mind when deciding on size and location, but you should make some rough lines now to help you decide on the location. Also keep the structure beneath the deck in mind when doing this, it would do any good to have a hatch with a support beam running down the middle.
With the hatches roughed in, measure and draw lines for the planks that fill the deck, using a centerline and working outwards to both sides is the most effective way, if you want to, you can also add some decoration there, and if you need more than 2 boards side by side, the centerline is the best place to join them (see attached photo for my solution).
Now with the planks all drawn out, start to enhance the lines, start by finalizing the hatches, on real teak decking it is common to have boards running along the outlines of the hatch as well, so start by adding a plank around the outline of the hatch, use the same size as the outline plank for the entire deck to keep things in line with each other. When doing the hatches, round the corners using anything that has a radius to your liking (i used a coffee cup). You will cut the hatch along the outermost outline and using this bend, but you can draw the box rectangular for easy measuring. See the attached picture for reference.
Make sure the planks on the deck run across the inside of the hatch, this will give nice clean lines!
Now, when attaching real teak planks in a corner joint, carpenters will always use a 45 degrees cut to join the planks, add a 45 degree diagonal line to EVERY corner in the deck. In some point i had to cheat a little and the line was not 45 degrees, but from exact inside to outside of the 'plank', in the centerline i used a more agressive angle to create the 'diamond' centerplank. Feel free to experiment, so far, any mistakes can be solved with an eraser.
When you are completely satisfied with outline you have drawn, it's time to move to the next step: routing!
Step 2: Routing the Grooves
Whatever depth you choose for the bits is up to you, but make it consistent throughout the entire project. i chose a relatively shallow 1 mm for the outside 'small' grooves. For the deeper grooves it is important you cut completely trough the first layer of the plywood, exposing, or just into the second layer, this will create a color difference which accentuates the groove. See the attached picture for reference.
With the first small groove bit set-up to the correct height, measure the exact distance from the flat edge of the guide foot of the router, to the center of the drill bit, in my case this was 51mm. Now place the guide of your choosing along the outer lines, the correct distance away from the line you have drawn, when you are completely satisfied it is the correct distance from the line, clamp it down on both ends. It pays to be accurate here. Also, make sure that the guide you choose does not bend, else you will end up with curved grooves.
Cut all the outside lines this way, including the 45 degree corner lines.
When you're all done with that, do the same for the outside planks of the hatches, you should only have to cut the inside lines, because you will use a jigsaw to cut along the outside lines to separate the hatch. I did route the straight parts of the outside line, to serve as an extra guide when i used the jigsaw, if you do too, be careful not to cut past the rounded corners!
When all outside planks and hatches are done it's time to change the bit for the deeper and wider groove of the infill planks.
Basically, the procedure is the same, take your time placing the guide, be careful not to overshoot into the narrower cuts of the outside planks on the ends and the hatches. The router may have the tendency to want to 'walk away' from the guide, try cutting in the opposite direction if this happens.
After you're done with this part, sit down, admire your work and have a beer, you earned it.
Beer done? Okay, back to work, step 3: the hatches!
Step 3: Cutting the Hatches
Test if the jigsaw will go trough the slit you made, if so, you can start cutting along the outside line, following the rounded corners you drew. For the straight lines you can use a guide, obviously that won't work for the rounded corners, just be careful and take your time!
Now the hatches will have sharp edges, as well as the decking where they will fit. Use a third routing bit with an inward curve to create a fillet of about 2~3 mm on both the hatch and the hole in which it will sit. The hatch can be filleted on both the top and bottom, the decking only needs to be hatched on the top. This will make sure you don't feel any height difference the hatch might have after final placement. Also it protects the side of the hatch a little from 'peeling' of the layers. See the pictures for clarification.
When this step is all done, it's on to the final step: finishing!
Step 4: Finishing
Basically, sand every surface smooth, use special care in the grooves, make sure no splinters remain.
The fillets on the hatches and the decking can best be smoothed by hand.
I use 100~120 grit sanding paper for finishing.
If you have any pencil marks left, use the eraser to get rid of most of it, a light sanding will do the rest.
When all is sanded smooth you have some decisions to make:
- Do you want to stain the wood or paint it?
- Do you want the grooves to remain as they are or do you want to fill them?
Staining the wood definitely has my preference, it will bring out the natural grain of the wood. I choose Teak stain, 2~3 coats brings the color close to the natural teak.
I left my grooves as they were, but you could also fill them with caulking to more closely resemble real teak. If you want to do so, first paint or stain the wood including the grooves, if you don't moisture will rot the wood under the caulking.
When the paint has dried, carefully place masking (painters) tape along the edges of the deep grooves. Make sure the tape adheres well, don't do the entire board, just one or two grooves at a time, the tape will come undone otherwise. Make sure you also place some tape at the 'ends' of the groove.
With the tape down, cut the nozzle of the caulking tube to a rather large diameter, you want it big enough to 'fill' the groove in one pass. When you have filled the groove with caulk, use a plastic or wooden tool, covered in water with dishwasher fluid to scrape it flat in the grove, simultaneously removing the excess caulk. You will get the hang of this, maybe make some small test grooves in some spare board before attempting this. The color of the caulk is up to you, but teak uses black (sometimes gray) caulking.
After each groove is done, remove the tape, any small excess caulking can be removed later when it's hardened.
And that's it! All your hard work will have given you a brilliant end result. Put the decking on your boat and boast to your friends!