Wiring - When to do

[eagle_3464]

I am about to the point of either wiring the wheel house or having it spray foamed. Just wondering what the pro's and con's are of doing one before the other? What is your opinion and why?

My wall framing is 2-1/2" and I plan to have 1-1/2" to 2" of foam applied so that would leave an air space between the foam and interior finishing to do the wiring after the foam. Thanks in advance for any input you have to offer.

[Smoker]

I put the flexable conduit in each stud space and then had it spray foamed. I have a beam dowm the center that I am making as my wiring chase way and all the conduit goes to that. I pulled the wires after it was spray foamed.I will try to post a couple pictures.

[Hawg]

I wired, then foamed but I sure don't know if that's best or not. If you don't run conduit(I didn't) be sure to take LOTS of pictures of the wiring before you foam so you can be extra careful where to put nails or screws for cabinets, shelves, racks,etc. Also, when you figure how much wire to buy-double it. Seems like I have miles, not feet, of wire by the time you do marker lights and all the little extras. I thermostat wire to the back of the house near where you sit is handy as is a cable from your TV to where you'll be sitting for an underwater camera. You'll think of many more.

[Lip_Ripper Guy]

I've wired and foamed over the top of it. If you do it that way, tape all your wiring down to the siding. Otherwise the foam will push it out and can cause issues with your interior finishing. You'll also need to be careful with the nail gun when you do the interior. Take pictures of all your wires before you foam. This saved me a huge headache when I hit a wire with the nailer.

You can do it after, but it's a challenge for the foamer to spray the same depth, so you may have to chip some out for your wires.

Another option is to do something like Ice Castle, and run all your wires down a false beam in the middle after the foam is sprayed.