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Old 03-13-2013, 02:39 AM   #1
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While inspecting my furnace I found where the kitchen sink drain exits through the floor to the gray tank along with several cables. I could see the ground through this hole. I want to seal it up and wanted to know how others have dealt with sealing such areas. Do you use the spray foam or just stuff some insulation in there? Suggestions would be appreciated.
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Old 03-13-2013, 02:43 AM   #2
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I covered mine with boards the best I could and then filled the voids with spray foam. Look for similar areas around the water heater and the low point water line drains.
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Old 03-13-2013, 02:47 AM   #3
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Water heater area and low point drains are good. There is another hole at the water pump area but it is nowhere near as open as the hole near the furnace. I might just stuff insulation in them since foam would harden and make any repairs difficult.
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Old 03-13-2013, 02:48 AM   #4
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If you can see the ground then you must not have the bottom membrane cover. If so I would place some weatherproof insulation around the pipe (from below) to seal out rain and wind. Then I would buy a split escutcheon(plumbing department at Home Depot, etc) which is a chrome plate that opens and install that around the pipe (from inside the cabinet) to give it a finished look.
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Old 03-13-2013, 02:55 AM   #5
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It has the bottom membrane cover but it is not fitted well around this opening. I hate to say sloppy work because everything else has been good but I will. Thanks for the suggestion. There is not enough room for a plate inside. Pipe is tight against a wall and there are also several cables sharing this hole. It's behind the furnace cover so it isn't visible with the cover in place.
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Old 03-13-2013, 06:20 AM   #6
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You can buy foam that does not expand like "great stuff" if you look around the hardware store. It is good insulation but does not get as hard
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Old 03-13-2013, 07:44 AM   #7
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Some people use steel wool to plug various holes.
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Old 03-13-2013, 09:41 AM   #8
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Quote:
Originally Posted by dalemac377

Some people use steel wool to plug various holes.
Probably good at keeping critters out but doesn't sound like it would block cold or hot air from entering. Just guessing at this. Maybe combination of steel and glass wool. I'm going to look tomorrow in the local Lowe's and see what's available.
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Old 03-13-2013, 10:50 AM   #9
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If you can see outside when looking down those holes, you should be concerned about keeping "critters" out.
I have used steel wool on the BIG holes in the floor of our rig, (and all the RVs have them) then sprayed in the expanding foam. Little holes all got the foam. I made sure the membrane on the bottom was closed up tight with no openings, and then I foamed all the holes in the frame that didn't have a purpose.


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Old 03-13-2013, 11:18 AM   #10
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We put steel wool into the cavity and then covered it with a sray foam ins. that does not expand and worked very well.
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Old 03-14-2013, 12:21 AM   #11
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I would not use steel wool as it will rust when exposed to any moisture!
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Old 03-14-2013, 01:30 AM   #12
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There is an awful lot of the rv that is made of steel which can also rust.
Anybody that has an aversion to steel wool-------they also make copper wool.
My thinking is you need "something" along this line if you are going to stop the rodents from getting in.


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Old 03-15-2013, 06:36 AM   #13
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Bought some glass wool insulation and stuffed that in the areas from the inside. The biggest hole was where the gray drain from kitchen goes out and the same hole is shared by 4 gas lines and several cables going in the trailer. Think that will be good. Also stuffed some around the water lines going in and out by the water pump. Thanks for the suggestions.
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Old 03-15-2013, 07:57 AM   #14
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Quote:
Originally Posted by Old Farmer
There is an awful lot of the rv that is made of steel which can also rust.
Anybody that has an aversion to steel wool-------they also make copper wool.
My thinking is you need "something" along this line if you are going to stop the rodents from getting in.

Everyone knows any frame steel is heavier orpainted or powder coated so you can not compare that rusting situation with steel wool!
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