Plyak12 - error in FG cloth quantity in BOM?

[gbgb]

The study plans call for 8 yards of wide FG cloth for the thin plywood version and 4 for the thick version.
However it seems that while for the thick version the quantity is correct - only the inside bottom is glassed with cloth, for the thin version the quantity should be 12 yards - hull bottom out, hull bottom in, deck out.
Is this correct?
If it is correct, then is it possible to glass the inside bottom with two pieces of cloth instead of a single piece? I went according to the BOM and bought 8 yards + 2 yards extra, so if I cut the extra lengthwise it will be ok for the inside (only at the widest part it will go up the side by 2 inches instead of the recommended 4 inches). Or should I simply go an buy another 4 yards?

By the way this does not seem to be the only error because it states that the fabric can be 30 inches wide, however this can not cover the wide part and go up the sides the recommended 4 inches (actually at the deck it simply cannot cover the width of the deck, at least not if you wish to cover as a single piece)

[jacquesmm]

In the building notes, the BOM for the standard version list 4 yards of wide fabric and 8 yards for the light version.
Look at the nesting drawing, the bottom is less than 12' and will be covered by 4 yards in length with a lot of leftover since the with of the bottom is about 28" wide. The glass is 50" wide. Let's say that at the widest part you will use 28 plus two times 6 over the chine = 40". There will be fiberglass leftover, almost half because you use less at the ends.
Look at the construction details page: the glass does not go all the way up to the sheer.
For the standard version, the deck is taped, no wide fabric.
For the light version, I show the small decks glassed using the leftovers from inside but I would not do that, it's an option.

[gbgb]

Thanks Jacques.
I am in the middle of building the light version so have to decide how to continue.
You say to cover the bottom as one piece and then cover the deck as separate pieces, but not recommended - for this I will have to buy more cloth since I want to do the deck in a single piece.

What about doing the bottom as several parts as follows (I think I can mange it - as I wrote I have 2m extra fabric):
Since I will not require the whole width of the deck material, I will cut from it long strips (About 4 inches wide) and will tape the seams inside lengthwise in one piece. I will then add the extra 2m that I have as 3 sections to cover the the whole bottom and go up the sides.
Is this OK or is it critical that the inside bottom is made of one piece?

[jacquesmm]

Here is a picture, it makes it easier to understand.


The black rectangle is a piece of fiberglass 4 yards long and 50" wide (360 by 125 cm).
You have 8 yards = 2 of those.
The red lines are the bottom and the deck plywood pieces.
The blue line is a 6" (15 cm) overlap over the side panel.
You can see that after covering the bottom, you have enough glass left to cover the decks.

Note that the deck glass is not necessary for strength. I don't show it in the 6 mm version but since I had so much fiberglass left in the 4 mm version, I decided we could use the leftover on the deck. There is no overlap at the deck, there is already enough tape there.
Either way, deck glassed or not, there is more than enough fiberglass. Do not waste $ on extra fiberglass.

[jacquesmm]

You can cut your glass differently if you want. You can cover the bottom in two halves and tape the seam with a layer of tape. It is a little bit stronger that way but not necessary. This boat could be built just with glass tape on the seams.

[gbgb]

Thanks.
Since I intend to leave a a natural finish I prefer to have the deck covered in one piece so no joining area is visible.
Therefore I will glass the inside bottom with two pieces + tape the seams.

[jacquesmm]

OK, good plan for the layout. I would use lighter glass for the deck like 4 oz. The light glass will become transparent, 10 oz. will be visible. You only need a couple feet.

[gbgb]

My cloth is 6Oz, and at least from glassing the bottom it looks totally transparent.
I completed the work today, did it in one session: prime the wood at the seams, apply a fillet, apply and wet tape, apply and wet cloth. There was a bit of cloth missing to fully cover the bottom and sides all through, so I decided to make sure it covers everything at the front and from about the aft 1/3 only the bottom is covered. I think it is not crucial as the 1/3 astern is more solid since it has two frames and the skeg (and I taped the seams).