Bottom Trim Recommendation

Finishes, paints and coatings

Bottom Trim Recommendation

Postby eLink » Mon Nov 09, 2020 1:29 pm

For my aluminum siding, I can't decide which type of trim to install at the bottom edge. The last detail on the right is my preference, it allows the siding to "float". But if I completely cover the bottom edge, do I really need to be concerned about moisture getting trapped? What if I drilled a few weep holes?
What do you think?
BottomEdge.jpg
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Edit: I plan to use something like 3M Extreme sealant tape under the trim (not shown).
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Re: Bottom Trim Recommendation

Postby tony.latham » Mon Nov 09, 2020 6:36 pm

eLink wrote:For my aluminum siding, I can't decide which type of trim to install at the bottom edge. The last detail on the right is my preference, it allows the siding to "float". But if I completely cover the bottom edge, do I really need to be concerned about moisture getting trapped? What if I drilled a few weep holes?
What do you think?
BottomEdge.jpg

Edit: I plan to use something like 3M Extreme sealant tape under the trim (not shown).


Hmm...

I wouldn't be excited about the screws going into the bottom edge of the plywood. It may cause some delaminaton and eventual water intrusion.

I have done it using the same trim in your diagram on the far right, but with the trim flipped around so the screws go in from the side.

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:thinking:

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Re: Bottom Trim Recommendation

Postby halfdome, Danny » Tue Nov 10, 2020 12:47 pm

I've always used 3/4" aluminum "C" channel.
I goop it up with OSI Quad sealant and place a screw every foot or so along the bottom edge.
With the typical 3/4” plywood being under sized and .032 aluminum skins on top it fits nice and tight.
:D Danny

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Last edited by halfdome, Danny on Tue Nov 10, 2020 2:49 pm, edited 1 time in total.
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Re: Bottom Trim Recommendation

Postby twisted lines » Tue Nov 10, 2020 1:27 pm

My thought is a small ( T ) Turned 90 so it has a true drip edge.
Tonys suggestion works well if you can turn your head :lol:
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