thompsondockside.com

I need to scarf 3 planks on my 1960 sealancer.I just viewed on page 9 of Restorations Txcapdan posted 2 pictures(HULL PLANK RESTORATION) of how he did the exact same thing i need to do and in the exact same location.(i love this web site)I need to know how he did this.I dont know what he meant by angle cut 4 inches.Also i noticed he did not stagger every board.Should every board be staggered?what type of wood are these side planks made of on these cortland sealancers.They also seem to have a curve the width of the board. How is this accomplished?Finally are butt joints recommended in this location to give it some added strength?Thankyou for any help and/or suggestions....Brian J

Planking is most likely 3/8 inch thick Douglas fir marine plywood.

The bevel of the scarf is 4 inches long.

I would definately recommend staggering the scarfs in adjacent boards.

I doubt the planks are curved thru their width.

You can add a butt-block at the backside of the glued scarf. Not necessary but a degree of redundancy is fine.

Andreas

Andreas, if I'm having a problem finding marine grade Fir plywood, is substituting either ash or birch acceptable for use below the waterline? My plywood choices from Condon in White Plains NY http://www.condonlumber.net/index.htm are:

MARINE (Exterior) PLYWOODS

ASH, WHITE A/1
BIRCH A/1 Sound Lauan Back
MAHOGANY, RIBBON STRIPE A/1
MAHOGANY, Genuine Rotary Cut
MAHOGANY, Genuine Plain Sliced A/1
MAHOGANY, BRUYNZEEL REGINA
Separate Bruynzeel color brochure available on request.
MAHOGANY, OCCUME
TEAK, Quartered, G1S (Mahogany Back)
Standard face thickness
TEAK, Quartered, Both Faces G2S
1/20” veneer face and back
TEAK, Black Line PLYDEK Decking Boards
TEAK, White Line Cabin Sole Plywood

George

PS Was the original Mahogany plywood plain sliced or rotary cut?

Do not use ash or birch. Neither have any decay resistance.

Okume or meranti marine plywood are acceptable substitutes for Douglas fir/larch. They are cousins of Philippine mahogany so they will look more like mahogany than Douglas fir/larch.

Andreas