Forum Discussion

thehippie's avatar
thehippie
Explorer
May 10, 2018

Underbelly insulation

This might be silly post but have to ask anyway.

Is the underbelly insulation on Travel trailers and toy haulers in California necessary?

This insulation only creates
Molds for moisture over the years and if there's water valve open when you turn on the shoreline water or the water pump which is likely to happen once or twice over the lifespan of a trailer.

And besides it's not that cold in California especially in Southern California where
Camping is all season long.
Seeking Advice

7 Replies

  • shum02's avatar
    shum02
    Explorer
    May 11, 2018
    thehippie wrote:
    shum02 wrote:
    I have had my rig for over 10 years camping in all weather conditions here in Ontario Canada including LOTS of wet winter driving and when I cracked open the belly of my KZ to install heat pads and heat trace it was as dry as a bone.

    Can't imagine California being wetter than here so I would hazard to guess unless you had a big rip in the coroplast it'll be as dry as a bone under yours as well.
    is this the coroplast?

    4mm Black 24 x 36 (4 pack) Corrugated Plastic Coroplast Sheets Sign *+ Vertical https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F272461997084


    Yes, that is coroplast.
  • thehippie's avatar
    thehippie
    Explorer
    May 11, 2018
    shum02 wrote:
    I have had my rig for over 10 years camping in all weather conditions here in Ontario Canada including LOTS of wet winter driving and when I cracked open the belly of my KZ to install heat pads and heat trace it was as dry as a bone.

    Can't imagine California being wetter than here so I would hazard to guess unless you had a big rip in the coroplast it'll be as dry as a bone under yours as well.
    is this the coroplast?

    4mm Black 24 x 36 (4 pack) Corrugated Plastic Coroplast Sheets Sign *+ Vertical https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F272461997084
  • shum02's avatar
    shum02
    Explorer
    May 10, 2018
    I have had my rig for over 10 years camping in all weather conditions here in Ontario Canada including LOTS of wet winter driving and when I cracked open the belly of my KZ to install heat pads and heat trace it was as dry as a bone.

    Can't imagine California being wetter than here so I would hazard to guess unless you had a big rip in the coroplast it'll be as dry as a bone under yours as well.
  • Lwiddis's avatar
    Lwiddis
    Explorer II
    May 10, 2018
    “And besides it's not that cold in California...”

    Rethink your statement above..think the Sierras, high desert etc.
  • SteveAE's avatar
    SteveAE
    Explorer
    May 10, 2018
    You will find a recent thread on this topic here that was started by a member who lives in S. CA.
  • Old-Biscuit's avatar
    Old-Biscuit
    Explorer III
    May 10, 2018
    Guess you have never been camping in the high desert of So. Cal. during winter months.

    And what valves are you leaving open putting water into the underbelly area?

    Fresh water tank drain and overflow......should stick thru/below underbelly
    Hot/Cold Low point drains.....should stick thru/below underbelly

About RV Tips & Tricks

Looking for advice before your next adventure? Look no further.25,151 PostsLatest Activity: Jul 25, 2025