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Old 11-08-2015, 11:13 AM   #1
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Adhesive caulk suggestions

I'm installing these beams later this week to the bottom of my aft deck ceiling . I'm using 1/2 sst carriage bolts with backing plates on the roof top . What adhesive caulk would be best ? I could use 5200 it's cheaper than 4200 but that would be permanent . But then again they are permanent beams .
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Old 11-08-2015, 12:43 PM   #2
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It seems that you have answered your own question.

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Old 11-08-2015, 01:32 PM   #3
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It seems that you have answered your own question.

David
Yeah I know , just bored . Thought maybe somebody had a better idea .
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Old 11-08-2015, 02:09 PM   #4
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Greetings,
Mr. PM. Since this is a permanent installation, why not forego the bolts and adhesive and epoxy the beams right into position?
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Old 11-08-2015, 02:15 PM   #5
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I've used Sika products with great results...

Here's a link that might prove useful to you:

Bonding | Sika Corporation U.S.
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Old 11-08-2015, 02:44 PM   #6
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I agree with RTF. 5200 sans hardware. Cleaner install, less opportunity for water intrusion and just as strong and permanent.
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Old 11-08-2015, 03:01 PM   #7
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" Since this is a permanent installation, why not forego the bolts and adhesive and epoxy the beams right into position?"

DAMAGE CONTROL , glue, 5200, epoxy all have a very limited range of motion before failure.

With thru bolts something dumb and ugly can happen and the unit may still accept a load.

"Stuff happens".
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Old 11-08-2015, 03:02 PM   #8
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RTF and Al . Are you talking about thickend epoxy only and no fiberglass tabbing ?
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Old 11-08-2015, 03:23 PM   #9
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RT has the right idea. If they ever come out of there after that, then there gonna be ready to come out of there anyway. There's a lot of folks around my area that talk 5200 for everything that attaches, but its ability to flex is not as good as its adhesive qualities. It seems that yours would be a great application for it.
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Old 11-08-2015, 03:42 PM   #10
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The beam that is up there now is just a 2x6 that's straight on the bottom. It's screwed from the top and thru bolted . The deck roof is a fiberglass sandwich with foam in the middle . The new beam that replacing it is about 3-1/2" x 5" that's radiused on the bottom.
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Old 11-08-2015, 03:51 PM   #11
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I would still use bolts or lag screws regardless of the adhesive. They will act as clamps during the final assembly. Boat parts move while underway and this will help everything together mechanically. You can always hide the heads by counter sinking and using plugs.
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Old 11-08-2015, 06:32 PM   #12
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5200 and hardware.
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Old 11-08-2015, 06:36 PM   #13
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Oh boy, you gave me a chance to say it again!
Real Men Use 5200! Glue it and screw it.
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Old 11-08-2015, 06:38 PM   #14
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Bill11 it's scary how much we think alike.
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Old 11-08-2015, 06:41 PM   #15
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I would use bolts. With lag screws one needs a smaller hole and the screws exert much outward pressure on the wood. Bolts use a hole that is the same size as the bolt shank so much less wood stress. I'd use more smaller bolts.

Or quite a few smaller wood screws w the heads on top of the roof. Round heads w fender washers would perhaps be more water tight.

For sealant I'd use Sika Flex 991 bedding coumpound or if the bolts or screws had the "holding things together" covered just use Dolfinite. It will seal for many years and comes right apart when needed. Lots of smaller screws and Dolphinite would be my first choice.
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Old 11-08-2015, 08:31 PM   #16
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I would 5200 or epoxy it. I would also if for nothing else bolt or screw it for clamping pressure...heavy duty with also add mechanical strength though maybe not needed just to hold the top on.

I would also core out where the bolts screws went to a solid plug for water tightness and compressibility...and glass or fill over top of the bolt screw heads so water could NEVER enter. Both heads with fender washers is just asking for trouble as the slightest movement breaks the sealant joints.
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Old 11-08-2015, 08:34 PM   #17
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Bill11 it's scary how much we think alike.
Well, thinking like me should scare you. Trust me.
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Old 11-08-2015, 08:38 PM   #18
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If you don't use the bolts you lose the backing plates. I think those would be important to have.
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Old 11-08-2015, 08:58 PM   #19
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https://en.m.wikipedia.org/wiki/Carriage_bolt

I'm confused why you would use a carriage bolt in this application. I would use a method similar to that psneeld suggests.

Re-Bedding Deck Hardware With Bed-It Butyl Tape Photo Gallery by Compass Marine How To at pbase.com
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Old 11-08-2015, 09:12 PM   #20
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I was planning on the round head of the carriage bolt against the bottom of the beam with a backing plate , heavy washer and nut on the roof top .
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