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Subject: Re: HELP....I am trying glue cedar to metal outside

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Message Thread:

HELP....I am trying glue cedar to metal outside

12/23/14       
machshnell Member

I have possibly a foolish project i am starting. I have a bunch of old cedar 3/4" boards, red cedar, that i have planed to 7/16" and i am wanting to glue to metal garage doors. i have three metal skinned baked on paint smooth insulated garage doors. I want to veneer the half inch cedar to the face of the doors. i was planning on using some 1" (stainless) finish nails and a ?mastic or glue that i could trowel out with small grooves and attach cedar. I have read about just caulk (3m 5200) and pl products but i thought a trowelled out mastic or glue that covered the metal door would add a layer of protection for the metal as well. I have also heard about the cedar moving and the metal moving differently? Not sure if an issue to have some flexibility between substrate. Not sure the best approach to this. i have a lot of time in planing and joining and want to do this once and not deal with delam. Any advice would be greatly appreciated. thank you

12/28/14       #2: HELP....I am trying glue cedar to m ...
Adam

Some people might call this a "fool's errand".
However, luck seems to like fools from time to time. You might be the one.

3M 5200 is one of the best adhesives for bonding totally different materials. I would use this as the adhesive. More is not better. The trowable adhesives that I know are pretty average compared to 5200.

I would use as few mechanical fasteners as possible they may cause problems. What type of joinery were you planning?

12/28/14       #3: HELP....I am trying glue cedar to m ...
machshnell Member

thanks for reply. I have planed all the boards to 7/16" and i am going to slot or "groove" all the edges with a 5/32" slot cutter and make 1/2" splines. and i guess glue one side of the spline into boards and let the other move?? not sure on that. any advice? I would rather not use mechanical fasteners for the difficulty added to the process and the ability to rust.


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12/29/14       #4: HELP....I am trying glue cedar to m ...
David R Sochar Member

All the local 'custom' houses have had garage doors made with cedar ticky-tackied onto them by site carpenters, laborers, and even some overhead door companies. PL400, a circular saw and a drill/driver were the tools used. The favored/required design is to mimic carriage house styles.

Then, in anywhere from a week to a year later, one or two or three boards fall off, get lost or driven over, and new cedar goes in. Then a few more. Some seem to last a few more years than others, but most get replaced with a new plastic or metal doors.

Failure is inevitable.

Besides ignoring the basics of wood construction, The doors weigh 2-3 times the original weight, and the .49 cent hinges bend and deform, causing misalignment and further problems. Tracks and motors are not sized for the additional weight and fail early. The lack of drainage consideration at panel joints allows water penetration, and a freeze thaw cycle then pries them loose.

It is better to redesign so the doors can be made sectionally in solid woods, and then use approved construction methods for building. Water must be dealt with at every point.


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1/3/15       #5: HELP....I am trying glue cedar to m ...
Steiph Zargon Member

Hmmmm... so the doors in question are "Man" doors like the one in the background of your photo... NOT the big "car" doors that open up with a mechanical contraption???

Seems to me you are certainly on a fools errand. I would rather just paint those robust metal doors with a nice oil based epoxy or poly. and save the wood for a deserving project. Making nice boxes or a blanket chest comes to mind.

If you want to make a fabulous wooden door then buy some 8/4 Cedar and fabricate the frame and use the wood you already have to make the panels. WOW that would be awesome!

Not sure what it would look like if you attach it to the face of the existing door(s)?. ;-{
And just how would you attach the door handles and locks, given the added girth you giving to the door?

So, if you are determined to do this.. I think a combination of high performance glue and mechanical fasteners would be best. If you don't want to see the fasteners... countersink the holes and make plugs of a contrasting wood and give it some extra flair.

Good luck!

 

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