IMO, those retail DIY Spray Foam kits (like Tiger foam or other foam kits bought from hardware retail stores) are over diluted and lower quality compared to professional Spray Foam type. Use Closed Cell / 2 lbs (aka Medium desity) outside and inside RV/TTs. For that size of location and road vibrations, I'd only get professional grade foam applied.
Being a RV/TT, you can do all the prep work yourself. And, apply any structure repairs / reinforcements yourself as well. And if wiring (like Roof Top AC units) areas are involved, you can install your own Electrical PVC piping as well. Thus, create a wire fish zone (just in case you need to change future electrical wiring) improvements as well. Prep it all, then take your RV/TT to the foaming company's location. They spray your rig when they spray others. Thus, saving on "their" travel and job Prep-Work costs as well. Thus, lower final estimate for them.
If wondering, I did my own prep work (took me 4 weeks) and got my previous Jayco's underbelly professionally sprayed (by a mobile professional company) as well.
One of the best mods we did for our previous 29 ft TT. And yes, I'd do it again - without hesitation. Contractor Grade is amazing stuff. Especially for small areas - like RV/TTs and you plan to keep your TT for 5+ years. re:
- click here - Hope this helps.
