Brine said:
Looking good Dave.
How much does the hat channel run? What are the dimensions?
bigwave said:
Very nice work Dave, I would like to know how much that cap channel cost too. =D>
Thanks Brine and bigwave.
The hat channel was made out of aluminum scrap I had. The scrap was bought over a year ago in a big batch I bought with a couple other large sections, so I'm not sure how much it costs. I do know it was 1/8" thick, about 8' long and about 16" wide. I located a local metal fabricator, called them and asked them to do form the channel as a "work in" job. I got a single 2" wide, 1/2" tall "C" channel, 5 sticks of the "hat" channel and 7 sticks of "L" channel done for
$100.00. They also gave me back the two left over aluminum strips, which are clean enough to use as spacers, trim, etc.
The dimension of the finished sticks, not including length were:
"Hat" channel: 5/8" tall, 1" wide at top, 1/2" wide at bottom. Top will be where the rivets for the deck sheet will be riveted. The bottom is where the rivets are set in the pictures.
"L" channel: Bent at 90 degrees, there is a curve to deal with, just like in structural extruded aluminum, but the strength is there. Each side of the "L" is 1 inch. Note: After using this, If I did it over again, I would make it either 1 1/2" or 2 inches. 1" is pretty tight to get rivets into and if you cut a 1" section to use as a bracket, you can only place a single rivet, where with taller section, you could use two rivets.
"C" channel: 2" wide, 3/8" tall bent at 90 degrees. Thick was made as an "error" by the fabricator, but was useful channel I was able to use in the front section. Turns out if I didn't have it, the "hat" channel would have been too tall to use in that area with the reinforcing backing sheet I used underneath the "C" channel. The hat channel used that way would have pushed the deck above the rub rail. The "C" channel combined with the 1/8" aluminum sheet above and below it gave me a height/thickness of 5/8 inches, a perfect height for placement of the deck sheet above the mounting nuts of the nose cap and allows the sheet to rest on the nuts, giving a bit of support in an area where there was none.
I am not sure, but I think this is much cheaper for the amount I bought than what a couple 25 foot sticks of channel would have cost me had I bought it pre-made from a aluminum distributor. I priced some extruded structural "C" channel online for $68.00/25ft, but the shipping was double the cost of the channel, making the total price unreasonable.
I want to make mention that when replacing rotted wood decks with aluminum, location of the deck height is a consideration to think about, especially if you want to re-use original aluminum paneling, which is cut to fit the thickness of the wood.
If you just throw the sheet down without raising it, you end up with side (and other) panels that are too short to reach down to the new deck without adding a "skirt" or other trim to make up the gap. I made a decision in the console area to not use additional support, because the center to center spacing was good to support the 1/8" thick aluminum, but I ended up with one panel that's too short and I'll have to add some trim to close the gap.
On the fore casting deck, I guessed the original deck height was 3/4 inch and used the channel I had made to raise the deck sheet to that height. On the trolling motor deck, I decided to raise the height where I could use the front cap's mounting nuts as support for the front tip of the deck. I may be wrong on the thickness of the original fore casting deck, it may have been thicker. If so, I may have to use channel or a piece of 1" square aluminum tubing I have to make up the height for the original transition panel I am wanting to keep.
I'm going to hire a man to weld in the transom and I may get him or the fabricating company to make me a new transition panel out of 1/8" sheet. This will make the trolling motor deck much more stable and secure, but will add additional cost. Decisions, decisions.....