How to Repair a Wide-Board Raised-Batten Canoe — Part 2

February 11, 2018


by Sam Browning
edited by Mike Elliott, Kettle River Canoes
email: artisan@canoeshop.ca

Note: In 2016, I put out a call for someone with a wide-board raised-batten canoe to bring it to my shop in British Columbia, Canada for me to restore and document as part of my second book ̶  “This Fancy Old Canoe”.

(photo by Nick Dennis)

I was contacted immediately by Sam Browning. He was about to start restoring one of these canoes.  He offered to take pictures of the project as he worked.  I offered to come to his shop to see the canoe and meet him in person until he let me know he lived in Ely, Cambridgeshire, England.

A few months later, I received a USB flash drive in the mail from Sam. It contained 300 images and a copy of the posts he presented on the ‘Song of the Paddle’ web forum as he documented the restoration.  For my blog (and eventually my book), I have edited Sam’s posts and added a few notes of my own (presented in italics).  For this article, I am presenting the wide-board repairs.

Many thanks to Sam for his excellent work and generous contribution to my book.

*****************

(photo by Sam Browning)

My plank repairs consist of three boards that need to be replaced. There is a small piece missing from the bilge-plank at the stern.  It starts at the last rib and runs to the internal stem.  The second is a bilge-plank on the port side spanning across six ribs and the third is a long bilge-plank on the starboard side spanning across 17 ribs.  My plan is to do the repairs in order from smallest to largest in order to learn on the small repairs and hone the process for the Big One.

(photo by Mike Elliott)

Copper canoe nails (16-gauge 1″ or 25 mm long) are harder to get out than tacks on a cedar-canvas canoe as they are driven through a basswood (or Spanish cedar) plank as well as rock elm ribs before being bent over (dubbed) and clinched. The nails aren’t tapered either (apart from the point) and they hold well despite their age.

(photo by Mike Elliott)

Getting rid of the heads and punching them through to the inside works best. I use an angle grinder set up with a 24-grit sanding disk to grind off the heads of the copper nails. Care must be taken to ensure that only the board to be removed is touched by the grinder.

(photo by Sam Browning)

For the first repair, I tidy up where the new piece of plank has to start, removing nails and chamfering the edge so that the new nails will go through both the new and existing wood.

(photo by Sam Browning)

The new plank is a piece of basswood cut carefully to its final dimensions and planed to match the thickness of the original boards (¼” or 6 mm). The end of the new plank butts up again the existing board and laps over it with a chamfered edge to match the chamfer on the existing board.

(photo by Mike Elliott)

When I am happy with the fit, I drill pilot holes for the canoe nails at the join and push them through from the outside.

(photo by Mike Elliott)

Next, whilst pushing them firmly from the outside, I bend (dub) the nails over with a clinching iron.

(photo by Sam Browning)

I wet the outside of the new plank with hot water so the nails  sink into the wood without doing any damage.

(photo by Mike Elliott)

Then, while holding a clinching iron on the bent nail inside, I hammer the outside until the nail is flush with the surface.

(photo by Sam Browning)

I repeat this along the top and bottom edge as well as two rows of nails in the stem. The end of the new plank extending past the stem is trimmed to complete the job.

I now turn my attention to the second plank repair. Because of what I’ve done already, I’m confident about the nailing procedure.  For this repair, I have to learn to fit a plank that bends in two directions.  In the factory, the planks would have been cut from patterns which (sadly) are not available to me.  When the flat shape had been cut, the outside of the plank was soaked with boiling water poured over it.  This swells the grain causing it to cup until the correct curve was reached.  Then, it was nailed into place.  My plan for the repair is to cut the plank oversize, hold it in place with a strap at each rib, then pour boiling water over it to cause it to curve.  As it bends, I should be able to tighten the straps and hold it in place until it dries.  I will then mark out the dimensions of the gap and work from there.

(photo by Sam Browning)

The first step is to fit basswood strips onto the outside surface of the exposed ribs. These spacers create a flush surface upon which to bent the oversized plank.  To make spacers, I cut strips and poured boiling water over them.  They bend into a suitable curve with very little pressure.  I then tape the spacers into place.

(photo by Sam Browning)

I chamfer the edges of the old plank so the chamfer on the new plank fits precisely and allows a line of nails to go through both.

(photo by Sam Browning)

To spread the tension from the straps evenly along the new plank, I put battens along the both the top and bottom edges.

(photo by Sam Browning)

I use steam from a wallpaper stripper rather than pouring boiling water to help the plank curve into shape.

(photo by Sam Browning)

Two people would have made things easier, but after holding the steamer in place for a minute or so, then moving it along the plank and holding it with my knee, I am able to pull the straps progressively tighter. I work my way up and down the plank until it is tight against the hull along its full length.  At both ends, I use ratchet straps and a couple of wedges to hold the curve tight to the hull.  I allow the plank to dry for a couple of days.

Before I remove the straps, I clamp some blocks under the plank and at the ends. These act as reference points so I can put the plank back in exactly the same place while I mark, trim and fit the top edge.

(photo by Mike Elliott)

A planking gauge is used to mark the position of the gap’s edge even though the plank covers it and I can’t see.

(photo by Mike Elliott)

The ‘L’ part of the gauge slides behind the plank and is moved along the edge of the gap while a pencil sits in the notch and draws a line.

(photo by Sam Browning)

Once the plank is marked, I use an apron plane to bring the plank dimension down to just outside the line. Then, a series of testing fitting, shaping, fitting, shaping until I have it just right.  Then, the inside edges at the ends were chamfered to match the existing planks.  The whole process takes about two hours before I am happy with it.  I run a line of masking tape above and below the gap.  On the tape, I mark where the ribs are so I can drill from the outside and place straps and blocks just to the sides of the ribs. This way, I can get the nails in, dubbed and clinched without worrying about the straps being in the way.

I nail the ribs, five in each, with a double row on the ends, then along the top and bottom edges into the battens – about 90 nails in all, drilled, pushed through, dubbed and clinched.

(photo by Sam Browning)

With the process honed, I turn to the Big One. I begin by making 16 basswood spacers for the ribs.

(photo by Sam Browning)

I steam and tape the spacers to the ribs.

(photo by Sam Browning)

I make two 12′ (3.7 meter) battens, arrange 16 straps and two ratchet straps. I make an oversized piece of basswood to fit over the gap.  I steam the plank and tighten the straps, then steam and tighten again.

(photo by Sam Browning)

I check to make sure it is all tight with no gaps showing, then leave it for a couple of days.

(photo by Sam Browning)

The marking, cutting, fitting, shaping routine is the same as for the second plank.

(photo by Sam Browning)

The final fitting and nailing proceeds smoothly.

(photo by Sam Browning)

It’s great how once you have done a job, you wonder what all the fuss was about. I suppose, at any time, I could have pulled a strap too tight and split a plank.  I could have planed too much off and left a gap.  A plank could have split while I was nailing.  If you need a plank for your board and batten canoe just let me know, I have a spare plank waiting in reserve.

mockup 02

The entire restoration process (including plank replacement) is described in my book – This Old Canoe: How To Restore Your Wood Canvas Canoe.
If you live in Canada, CLICK HERE to buy the book.
If you live in the USA, CLICK HERE to buy the book.
If you live in the UK, CLICK HERE to buy the book.
Si vous habitez en France, CLIQUEZ ICI acheter le livre.

If you have read the book, please post a review on Amazon, Goodreads and/or any other review site.

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