Underfloor Insulation (1 Viewer)

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Sep 3, 2012
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C Class Elddis 175
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8+ years
Has anyone insulated the underside floor of their motorhome.
I was under my van today and there is a large expanse of board , open to the elements that would appear to be easily covered with say the double reflective radiator type foil. It may help to keep the inside of the van warmer with less heat loss.The underfloor is clean and dry and does not appear to be subject to road dirt and appears to be high enough such that it would not easily be blown off or damaged etc.

if it was applied would it be best to glue it on or staple it for example -anyone done it?:unsure:
 

dave newell

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Oct 31, 2008
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Home converted PVC
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26yrs
Assuming that's your motorhome in your avatar then radiator foil will add about 1-2% thermal insulation to the floor so not really worth the effort or cost. Your floor will be made of a sandwich of ply top layer, thin ply bottom layer and usually a polyurethane foam type insulation layer in the centre, the total floor thickness is usually around 40mm and the foam part will typically account for about 3/4 of that thickness. Bearing in mind that heat rises you would get more benefit from sticking it on the roof and even then its not going to be a massive benefit.

D.
 

haganap

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Dec 5, 2007
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I'm an oldbie MH number 10
I did some on mine but it just fell off after a while. The better benefit is to utilise two things. One is to use an awning skirt around the van sides. This then prevents wind from gettting under the van which is the major cause of heat loss or should I say incoming cold. The other is to look at all the air drops within the van. Some reason Brit vans have an awful lot of them which again just allow cold winds through.
As Dave says the roof is a big source of heat loss especially in winter through sky lights etc.
 

Jaime

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Mar 24, 2015
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... One is to use an awning skirt around the van sides. This then prevents wind from gettting under the van which is the major cause of heat loss or should I say incoming cold.

Yea, did that a few years ago on previous RV (or rather, former partner did this on our former RV) and it made amazing difference. We skirted it all the way round, originally to stop small dog from investigating when tied up to the door handle outside but turned out in dead of winter and freezing conditions it worked a charm on stopping underneath bits and pieces from freezing up.

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