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Spray Foam under side of Travel Trailer?

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  • Jun 21st, 2010 8:10 pm
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[OP]
Sr. Member
Mar 17, 2010
600 posts
24 upvotes
behind your left sho…

Spray Foam under side of Travel Trailer?

My wife has a 2006 Jayco FBS 29ft Travel Trailer and mice / chipmunks have gotten into its under belly insulation layer. It's under floor Fiber Glass insulation and supporting fabric layer has many "swiss cheese" holes - before I made their discovery. It's under floor insulation must be removed and/or optionally replaced. Ideally, replaced - due to its under floor forced air heating pipes. And if they did it once, they will try again. Thus, looking for better insulation method.

I've already done hours and hours of research on Spray Foam and am now down to my final pen strokes. I can either hire it out ($900) or buy a $450 DIY Spray Foam system + over spray covering materials + my limited time (which calculates to $900 anway). Both methods would use 2 lbs "closed foam" and would be 2" thick. And where needed, it's under side sensitive electrical systems (like 12V motor for its power slide) would be protected - before spraying foam around it. Since we plan to keep this "seasonal camp site" trailer for 10+ more years, it's insulation upgrade cost us would be very little each year - from an overall `total time` ownership perspective. Thus, I don't mind spending dollars on it NOW - for something that works. And works better then factory.

To view our seasonal site setup, surf: http://i178.photobucket.com/albums/w251 ... 0_1352.jpg & http://i178.photobucket.com/albums/w251 ... 0_1388.jpg

Long post short.... Do you know anyone who has used Spray Foam (2lbs - closed cell) under their trailer's floor? If so, how'd it work for them? Do they feel it was worth it - for them? One last "sanity check" before I buy / implement on my wife's summer time baby.

Thanks for your `sanity check` feedback.

.
7 replies
Deal Addict
User avatar
Oct 12, 2001
3556 posts
67 upvotes
I see lots of this where oil guys live in their trailers instead of camps in the winter. It also serves as a bit of extra protection for them on gravel roads beating the underside too.

Totally normal out here.
What the H E double hockey sticks have I done now?
Sr. Member
Dec 5, 2007
543 posts
1 upvote
NB
We don't own a travel trailer but had a friend who did something very similar to what you are contemplating and it worked like a charm. Only suggestion I have is that it is not only a VERY messy process, but there is definately a technique to applying it for best results. So IMHO it would be well worth the extra labor to have someone who does this for a living complete the job for you. Definitely use only closed cell foam.
Deal Addict
User avatar
Nov 9, 2003
1090 posts
63 upvotes
Grimsby
I would definitely agree on having the job done rather than try yourself. This is not a 'do it yourself' project. Mess and possible health issues with over spray make this a job for those with experience IMO
[OP]
Sr. Member
Mar 17, 2010
600 posts
24 upvotes
behind your left sho…
Today, I got the under side of our Travel Trailer mass spray foamed with 2 lbs Close Cell Spray - professional grade.. The Spray Faom certified contractor started his mixture at 4:30 PM and after cleaning his hoses, he pulled out a 7:30 PM. 3 hours of his specialised time. Much faster and more professional then me - with a DIY kit (while trying to spray up side down) - for the same cost.

For lots of AFTER and BEFORE pictures, surf many pictures within:

http://s178.photobucket.com/albums/w251 ... ?start=all

Note: To enlarge the small thumbnail picture, simply mouse button "left click" on it.

Will know long term pros / cons in a few more years. But for a seasonal site trailer (like ours), I was told many times there's huge benefits in using professional grade spray foam under its wooden floor (instead of thin fiber glass batts with that fabric matt). So far, this spray foam is looking great. And, it already "firmed up" the previous flex feeling & squeeking sounds while walking on its inner floor.

Hope this helps others...

.
Deal Addict
User avatar
Nov 9, 2003
1090 posts
63 upvotes
Grimsby
Your man did a very nice job of under spraying that trailer. No mess or over spray, very neat and not the simplest place to be doing the task :)
Sr. Member
Dec 5, 2007
543 posts
1 upvote
NB
Looks like the contractor did a great job and you should see a significant difference in very hot/cold weather now.
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