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Fiber Cement Siding: Cutting Around Conduit and adding Joint Covers

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cls89

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Feb 13, 2020
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138
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Southeast Michigan
I plan on installing fiber cement siding on the outside of my garage. The panels will be installed vertically. Going over the old siding. See link for product details.

I want the end result to look nice so I’m looking for advice on best approach to cut the opening for the electrical conduit. See photo. Should I measure and drill a big enough hole than cut the panel across it’s length, cutting the hole in half than I can join the panel around the conduit like a puzzle? Should I cut the panel across it’s length first and than cut some semi circles on each side so I can fit around the conduit? In ether case I would think I need to hide the opening around the conduit with some type of flange/ round trim cover. Any recommendations for flange covers? It would need to be two semi circles that clip together. Unless there’s something else I can use.

Also I want to hide the seems between panels. Is there a joint cover/H-Molding I can use to hide the seams between the siding panels?

IMG_1628.jpg



https://www.menards.com/main/buildi.../primed516x4x10textpan8ng/p-1444450998347.htm


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yeldogt

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Jan 2, 2012
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18,184
cls89 said:
I plan on installing fiber cement siding on the outside of my garage. The panels will be installed vertically. Going over the old siding. See link for product details.

I want the end result to look nice so I’m looking for advice on best approach to cut the opening for the electrical conduit. See photo. Should I measure and drill a big enough hole than cut the panel across it’s length, cutting the hole in half than I can join the panel around the conduit like a puzzle? Should I cut the panel across it’s length first and than cut some semi circles on each side so I can fit around the conduit? In ether case I would think I need to hide the opening around the conduit with some type of flange/ round trim cover. Any recommendations for flange covers? It would need to be two semi circles that clip together. Unless there’s something else I can use.

Also I want to hide the seems between panels. Is there a joint cover/H-Molding I can use to hide the seams between the siding panels?

IMG_1628.jpg



https://www.menards.com/main/buildi.../primed516x4x10textpan8ng/p-1444450998347.htm


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Click to expand...

Are you doing B&B ? That's how most people use the panels.

There is no great way to do what you want -- having it fall by a Batten works
 
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cls89

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Feb 13, 2020
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138
Location
Southeast Michigan
yeldogt said:
Are you doing B&B ? That's how most people use the panels.

There is no great way to do what you want -- having it fall by a Batten works
Click to expand...


I’m open to doing a board and batten style. What type of battens would you use with cement board panels?


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yeldogt

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cls89 said:
I’m open to doing a board and batten style. What type of battens would you use with cement board panels?


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They make trim lengths you can use. Boral and Hardi ... I'm sure others. Same material.

If you do wide/ narrow look boards ... you can use fewer ...
 
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crf731

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Remove the conduit and drill a hole or make a half hole in two of you cement panels and start at the conduit and work out from there.
 
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duneslider

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Riverton, Utah
crf731 said:
Remove the conduit and drill a hole or make a half hole in two of you cement panels and start at the conduit and work out from there.
Click to expand...

This is how I have done it. Then just caulk the seams and all is good. It a fairly normal thing to happen, even on new houses. Siding comes after plumbing and electrical and there will always be penetrations some place. Really thoughtful builders/contractors will put blocks in at the penetrations before the siding guy gets there but I rarely see that unless it is a higher end build.
 
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i4ni

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Jan 23, 2010
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1,015
I installed vertical CertainTeed Fiber Cement Panels on the wall of my dog kennel that the chain link runs attach to and they have opposing rabbit joinery on each side so you end up with a 1" over lap that you caulk behind so no batten strips are needed. I don't know if Hardy is the same or not. I didn't want battens because dogs will chew and pull on any protrusions that they can plus battens alone don't seal good.

If at all possible I would take the time to just pull the conduit and do it right. Fwiw
 
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rburke65

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Nov 10, 2007
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Location
Canfield, Ohio
Just disconnect the wire on the inside, pull wire back to the outside, disconnect conduit, install the siding, drill hole for your LB electrical fitting, reverse process
 
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cls89

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Location
Southeast Michigan
Thank you all for the help

I have one more question about fasteners. The installation instructions show I can use siding nail, roofing nail, or ring shank siding nail. It says the fasteners must penetrate a minimum of a 1-1/4” into structural framing. Since I’m going over old siding, I have to go through about 1-13/16” of material (new siding + old siding + sheathing) to reach the studs from the outside. To get enough fastener penetration into the stud I need to use a 3 inch nail. I plan on installing using a pneumatic nail gun. I’m having a hard time finding 3 inch long siding or roofing nails for pneumatic nail gun on the menards or Home Depot sites. Any recommendations?


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