Seal design for a square drop rear door?

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Seal design for a square drop rear door?

Postby *Inside » Thu Feb 18, 2021 10:51 pm

I'm building a 5x9x4(H) square drop and have mulled how to do a rear door for about a month now.

Top open hatch: Top of trailer is only 5.5' above the ground so it will be very difficult to stand under the hatch to do any cooking.

One large side open hatch: Challenger Doors/Vintage Technologies has a 48x40 door, but it only seems to work for a rear storage space.

Van style doors, (like Levi Mize's design) seem to be the way to go though!

So - how does this design look? Using regular RV style trim w/ hatch seal.

RearDoor1.png
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RearDoor2.png
RearDoor2.png (366.8 KiB) Viewed 495 times
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Re: Seal design for a square drop rear door?

Postby MickinOz » Fri Feb 19, 2021 3:25 am

Side hinged doors don't float my boat, but each to his own.
Your seal arrangement might leak at the point where the horizontal piece meets the vertical piece.
I would apply standard roofing techniques, whereby your upper piece always overlaps the lower piece to prevent water entry.

Hope my little sketch makes sense.

Seal for hatch.JPG
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Re: Seal design for a square drop rear door?

Postby MickinOz » Fri Feb 19, 2021 3:36 am

Also, you can have a top hinged hatch, and the height if you want, though it is probably not as simple to build.
Squaredrop hatch.JPG
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Re: Seal design for a square drop rear door?

Postby OP827 » Fri Feb 19, 2021 8:35 am

Did you see how rowerwet built his latest foamie back door? It still has the hinge in the back, but hatch shape creates more height when open.
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Re: Seal design for a square drop rear door?

Postby twisted lines » Fri Feb 19, 2021 10:32 am

I am hoping to keep the dirt out to!
Next time I would find it much more enjoyable to buy the door :thinking:
5.5 X 10 Flatback Benroy in a pile,
And it's growing!
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Re: Seal design for a square drop rear door?

Postby Pmullen503 » Fri Feb 19, 2021 10:42 am

A drip edge at the top is a good idea too. Think of the seals as a last resort against water and dirt infiltration and design to keep as much water away from them as possible.
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Re: Seal design for a square drop rear door?

Postby working on it » Fri Feb 19, 2021 11:40 am

*Inside wrote:I'm building a 5x9x4(H) square drop and have mulled how to do a rear door for about a month now.

Top open hatch: Top of trailer is only 5.5' above the ground so it will be very difficult to stand under the hatch to do any cooking.


MickinOz wrote:Also, you can have a top hinged hatch, and the height if you want, though it is probably not as simple to build.


* I opted for a top-hinged hatch, figuring that the heavy weight of the hatch door, a single piece of 3/4" plywood (49.25' tall x 48" wide), would eventually cause sagging if mounted to the side (i.e., like on an old Camaro...). With attached hardware, the hatch weighs over 50 lbs., so it would've required a single continuous "piano" hinge, but instead I wanted to use gate hinges. I use three hinges on each door(under 20 lbs each), to prevent sag, so if I had mounted the hatch sideways-opening, I would've needed to use 5-6. As-is, it hangs nice& securely on three.

*
hatch details1.jpg
hatch details1.jpg (202.64 KiB) Viewed 396 times


* The top of my trailer is 73.5" above ground-level (24" frame height + .75" floor + 48" wall height + .75" roof thickness), so I can stand underneath with the hatch raised to 90 degrees, but I chose to use prop bars to lock it into place at either 105 degrees or 110 degrees, to clear space for taller folks, or if on uneven ground. I grew tired of lifting it and holding it up while inserting the hold-up props (I had a bad rotator cuff at the time, still do, somewhat), so I added a gas-spring to help... http://www.tnttt.com/viewtopic.php?f=21&t=61432.

* The top-hinged hatch has served me well over the years, and with a waterproofed seal between roof and hatch, it is a good cover from sun & rain, when opened. I've needed to use bulb-type D-seals and spring-loaded right-angle latches (2 sets) to keep it sealed against dust, but it never had a problem with water intrusion. I'm sure a manufactured hatch would've been better, but mine is fine now.
2013 HHRv "squareback/squaredrop", rugged, 4x8 TTT, 2220 lbs
  • *3500 lb Dexter EZ-Lube braked axle, 3000 lb.springs, active-progressive bumpstop suspension
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  • *extended-run, on-board, 2500w generator *Coleman dual-fuel stove & lantern, Ikea grill, vintage skillet
  • *zinc/stainless front & side racks *98"L x 6" diameter rod & reel carrier tube on roof
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Re: Seal design for a square drop rear door?

Postby Tomterrific » Fri Feb 19, 2021 12:16 pm

I built my square drop like Mick described. The hatch is L shaped and is hinged 12 inches into the roof. The hatch is then 12 inches higher than the camper when opened. It makes a neat roof to stand under. I hung a curtain from the hatch and made a private stand under to change clothes. We now erect a pop-up canopy over the hatch. It makes a nice 10 x 10 sitting room.

Tt139181139181
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Re: Seal design for a square drop rear door?

Postby twisted lines » Fri Feb 19, 2021 12:26 pm

Tomterrific wrote:I built my square drop like Mick described. The hatch is L shaped and is hinged 12 inches into the roof. The hatch is then 12 inches higher than the camper when opened. It makes a neat roof to stand under. I hung a curtain from the hatch and made a private stand under to change clothes. We erect a pop-up canopy over the hatch. It makes a nice 10 x 10 sitting room.

Tt


Yes it does :thumbsup:
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And it's growing!
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Re: Seal design for a square drop rear door?

Postby *Inside » Sat Feb 20, 2021 12:42 pm

Ugh. I keep wavering between designs. I kind of want to do an L-hatch, but I'm worried it's going to look janky. Much of the rigidity of a teardrop hatch comes from the shape - with an L-hatch it'll have to come from the material :(

I'd really rather do a teardrop hatch, but I'm concern that it will take a very long time to do it.
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Re: Seal design for a square drop rear door?

Postby MickinOz » Sat Feb 20, 2021 9:35 pm

Don't stress mate.
Last time I looked, there were no actual rules.
Do whatever works for you.

*Inside wrote:Ugh. I keep wavering between designs. I kind of want to do an L-hatch, but I'm worried it's going to look janky. Much of the rigidity of a teardrop hatch comes from the shape - with an L-hatch it'll have to come from the material :(

I'd really rather do a teardrop hatch, but I'm concern that it will take a very long time to do it.
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Re: Seal design for a square drop rear door?

Postby OP827 » Sun Feb 21, 2021 9:43 pm

*Inside wrote:Ugh. I keep wavering between designs. I kind of want to do an L-hatch, but I'm worried it's going to look janky. Much of the rigidity of a teardrop hatch comes from the shape - with an L-hatch it'll have to come from the material :(

I'd really rather do a teardrop hatch, but I'm concern that it will take a very long time to do it.


There will always be a solution, just need to look for it a little bit more. How about ghcoe #1 build hatch for inspiration?
http://www.tnttt.com/viewtopic.php?t=54099#p984564
And hatch starts at Page 12: http://www.tnttt.com/viewtopic.php?f=55&t=54099&start=165#p1021536
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Re: Seal design for a square drop rear door?

Postby Tomterrific » Tue Feb 23, 2021 8:52 am

I made my hatch out of Revolution ply. If ever there is a flimsy tear material, this is it. The strength comes from 1 x 3 and 1 x 2 furring strip battens and surrounds. The square back sides are cut 45° one foot in and one foot down to make a gusset to support the L. It is so light weight I can easily lift it with one hand, and I am not a strong person.

A problem I ran into, and solved, is a barely leaking Hurricane hinge. The hinge will not work in a flat orientation. I ran a 6 inch strip of sheet rubber over the hinge and extended it an inch over the side. I would now suggest a piano hinge with the rubber cover.

Tt
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Re: Seal design for a square drop rear door?

Postby Pmullen503 » Tue Feb 23, 2021 12:40 pm

I had a very bad experience with Revolution Ply. If it gets wet and stays wet for any length of time, it will delaminate. Constant vigilance is required.
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