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Old 02-16-2016, 06:46 AM   #11
Mini-Skoolie
 
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Location: Lee, Florida
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Year: 1995
Chassis: International 3800
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Originally Posted by Hank's P-O-S View Post
Hmmm. Ya learn something new everyday!
I had assumed that you would just be using plexiglass.
You might want to look into polycarbonate. It is carbon fiber reinforced acrylic.

A guy I know has made several fairly large robots out of the stuff.
Lexan is just a commercial name for polycarbonate.
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Old 02-16-2016, 08:26 AM   #12
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Originally Posted by Dana View Post
Lexan is just a commercial name for polycarbonate.
My bad, again!

I must admit that I never knew that. Usually when people say lexan they go out and buy the cheapest plexiglass that can find, so now I ASSume that this is always the case.....
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Old 02-16-2016, 08:38 AM   #13
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Originally Posted by Hank's P-O-S View Post
Do you really need the hatch?
I would suggest removing it and covering the hole over with some 14ga sheet metal and self taping screws.
That seems to me like it would be the bust option.

I tried a lot of different things to try and get my hatches not to leak. Removing them was the only thing that worked!
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Old 02-16-2016, 10:40 AM   #14
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The roof hatches MCI used are a different dimension than school bus roof hatches. Instead of square they are more rectangular. You may want to contact Luke at US Coach or Sam at Caylors Supply to see about a used MCI roof hatch.

I have an Avion that has non-standard sized roof vents. The OEM replacements are made of unobtainium and priced accordingly. Instead of reducing the size of opening I used a piece of Lexan to cover the hole. It has been up there more than five years and looks exactly like it did when I put it up there.

The one real upside is it really lets a lot of light into the coach. The one real downside is it really lets a lot of light into the coach.
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Old 02-16-2016, 10:57 AM   #15
Mini-Skoolie
 
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Join Date: Feb 2016
Location: Lee, Florida
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Year: 1995
Chassis: International 3800
Engine: T444E
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Quote:
Originally Posted by cowlitzcoach View Post
The roof hatches MCI used are a different dimension than school bus roof hatches. Instead of square they are more rectangular. You may want to contact Luke at US Coach or Sam at Caylors Supply to see about a used MCI roof hatch.

I have an Avion that has non-standard sized roof vents. The OEM replacements are made of unobtainium and priced accordingly. Instead of reducing the size of opening I used a piece of Lexan to cover the hole. It has been up there more than five years and looks exactly like it did when I put it up there.

The one real upside is it really lets a lot of light into the coach. The one real downside is it really lets a lot of light into the coach.
Unobtainium!

I think to just get the bus water tight and move on from this ONE issue we will go with the Lexan. Did you use clear or tinted Lexan. I was gonna go with 1/4" tinted so it will let "some" light in.

What sealing did you use?
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Old 02-16-2016, 04:44 PM   #16
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I used clear because that was all that my local Ace Hardware had on the shelf.

I sealed it with butyl rubber tape.

I used some all thread through the Lexan to a cross bar that ran across the opening and cinched it down snug.

It has held tight and hasn't leaked a drop in over five years.

It is a bit red neck but it works and it was inexpensive.
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Old 02-18-2016, 03:12 PM   #17
Mini-Skoolie
 
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Join Date: Feb 2016
Location: Lee, Florida
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Year: 1995
Chassis: International 3800
Engine: T444E
Rated Cap: 36 adults
For anyone interested I have found the answers I was looking for, I don't like the answer, but I found it.

This is what I got from Thomas Built Buses Inc.

"The hatch you had in your vehicle was an Allied roof hatch. They are long out of business. Their measurements were 21 X 23 . "

So there it is, Allied roof hatch, no drop-in replacements.
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