Do the walls expand and contract so much with the weather that I need to use the minimal expanding foam "designed to fill and seal gaps around windows and doors and anywhere buckling needs to be avoided. Cured foam dries to a flexible and soft consistency."
![Image](http://mobilehomerepair.com/phpbb/userpix/4838_wd_1.jpg)
Or should I use the regular foam "expands to take the shape of cracks and voids, cured foam dries rigid."
![Image](http://mobilehomerepair.com/phpbb/userpix/4838_sub_04_1.jpg)