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Another Roof Question

What is the thickness of the fiberglass on the roof. I recently discovered a significant crack with delam on the roof. Am trying to determine if the edge of the delam (see photo) is the total thickness of the fiberglass?
I can't see under this cracked area very well; but it is dark in color, smooth, and does not have any fiberglass fibers.
The edge of the crack has two colors; white on top and brown below. Interestingly in this area the brown tapers out and the white gets thicker. Wondering if this might be a previous repair rather than original factory glass.

Thanks for thoughts,
Dick
Dick, '03 U320 40' Tag, 2 slides, Coach #6075
Full Timers
2009 Honda CR-V

Re: Another Roof Question

Reply #1 –
I'm guessing that is a previously repaired area.  That surface doesn't look anything like the surface of my roof (which is very smooth).
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Another Roof Question

Reply #2 –
Foretravel painted our roof a few years ago, which gave it a bumpy look. Like orange peal or a golf ball.

Dick, '03 U320 40' Tag, 2 slides, Coach #6075
Full Timers
2009 Honda CR-V

Re: Another Roof Question

Reply #3 –
No, we are commenting on the patterned print through. DOES look like a repair, not OE roof material.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Another Roof Question

Reply #4 –
Quote from: Dick S –
What is the thickness of the fiberglass on the roof?
We never answered your question about the thickness of the fiberglass.  I have worked on several openings in our roof, but never measured the fiberglass and gelcoat "skin".  I think it is fairly thin - probably less than 1/8" total, and very consistent in thickness and color.  The thread linked below contains a photo of a wall cutout plug (Reply #5) clearly showing the outer surface composed of brown fiberglass mat covered with a thin coat of white gelcoat.  The fiberglass on your coach roof should be similar in construction, but with the additional layer of roof paint applied by FOT.  I don't know how thick the FOT paint layer is, but I'm guessing it might be a slightly different color from the original (very) thin gelcoat?

Hope this helps.

Construction question
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Another Roof Question

Reply #5 –
My 2002 bathroom vent hole.. I will be replacing the one above the sink soon..(2 weeks approx) , I will measure then.. for future reference

Re: Another Roof Question

Reply #6 –
The FG roof is only a covering to make it waterproof and is extremely thin-- the structure is the metal and plywood under it.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Another Roof Question

Reply #7 –
Our coach has a thin layer of thin Fiberglas and thicker wood and is .400 inches thick total. No mat. I put several of our solar panel fasteners through it to hold them down.

Pierce
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)