I want to install an exterior light fixture onto a 3/4″ thick trim block (PVC).
I plan to use a pancake box. Do I need to recess the box into the trim block, or can I surface mount it?
Also, is there any special size or type of pancake box that I should use?
TP
Fine Homebuilding Recommended Products
Standard Marking Chalk
We like white chalk because it’s non-permanent and wears off easily — this is especially helpful when marks are exposed and need to disappear.
Shingle Ripper
This tool makes tearing off shingles easier and faster, providing powerful leverage that allows you to work comfortably. Its beveled teeth and wide blade make it easy to remove nails and push shingles off the roof.
Sledge Hammer
Used to tap walls or sheathing into position, we all this the “persuader” on the job site. This is a demo model, so it can survive the job site and the back of the truck — a true must-have.
N95 Respirator
PPE is a must, especially when cutting and sanding. We recommend you always have a box of respirator masks on the job site.
Cepco BoWrench Decking Tool
This tool makes straightening deck boards a breeze during installation.
Replies
It depends on the depth of the fixture base.
Used to be many fixtures were big enough and deep enough to accomodate a 3R pancake (3R = 3" round), and some could cover a 4R.
For most fixtures these days, there isn't enough depth for a pancake. So you'll probably have to recess the pancake into the block.
Check out Arlington industries, they make some excellent mounting blocks for siding that integrate the electrical box into the mounting block. They make a lot of really good stuff.
Cliff
http://www.aifittings.com/whnew110.htm
http://www.aifittings.com/whnew63.htm
http://www.aifittings.com/whnew13.htm
http://www.aifittings.com/whnew4.htm
http://www.aifittings.com/whnew25.htm
http://www.aifittings.com/k_4.htm
http://www.aifittings.com/whnew24.htm
http://www.aifittings.com/k_1.htm
http://www.aifittings.com/whnew51.htm
It's going to rust eventually. If your light fixture is designed to sit flush on a finished surface then I'd recess the box to hide it.
Scott.
Always remember those first immortal words that Adam said to Eve, “You’d better stand back, I don’t know how big this thing’s going to get.â€