Filling a gap advice.

[boiledowl]

In the garage of my motor home ( in a few spots) there is about a 1/4 to 1/2" gap between the very back wall and the floor. It looks like they put some sort of foam backer rod in the gap and then put a thin piece of angle iron over that seam. I removed the angle iron and noticed a few spots where if you push against the back wall you can see outside. I need opinions on what to use to make this more air/water tight. Is this foam backer rod standard or did they scrimp. It will be a fairly easy fix but I need to do it right. Is there something available for such a fix? Thanks

[Tha_Rooster]

Originally Posted by boiledowl

In the garage of my motor home ( in a few spots) there is about a 1/4 to 1/2" gap between the very back wall and the floor. It looks like they put some sort of foam backer rod in the gap and then put a thin piece of angle iron over that seam. I removed the angle iron and noticed a few spots where if you push against the back wall you can see outside. I need opinions on what to use to make this more air/water tight. Is this foam backer rod standard or did they scrimp. It will be a fairly easy fix but I need to do it right. Is there something available for such a fix? Thanks

Pictures?

[Gary RVRoamer]

Sounds like another example of a "shade tree" fix for sloppy factory workmanship. Could be a factory patch done at the end of the assembly line, or maybe done at the dealer in response to a buyer complaint. If you have the skills, do it right, or as close to right as you can manage.

[Ray,IN]

Big gap filler foam spray would be my choice. If it would be more practical, find a brand that sprays upright instead of having to invert the can.

[magicbus]

Not sure if I quite understand the application, but if could be solved by a large bead of caulk I would recommend Big Stretch latex caulk. It can fill a half-inch gap without sagging.

https://www.amazon.com/Sashco-Stretc...35890160&psc=1

[eddndee]

If open to the outside, I would look at some flashing on the outside to keep the rain out.