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As new rigs come out R values are increasing by using special reflective materials. One may have a value of R40 in the floor but the big loss is through the windows, dual pane glass with a 1/2 inch spacing (vacuum) will give a R factor of 2 to 2.5. In an RV with many windows that are dual pane and a 1/4 inch spacing, the R value will only reach 1.5 unless sealed. Guess where ice will form in very cold weather over a period of time? Normally the windows; even if they are dual pane. So until the manufactures do something about increasing R values with the windows (sealed units), the higher R values in the walls, ceilings and floors add little value to reducing heat loss. On our four slides, only the kitchen slide seems to be the problem where lino is in place of carpet; we have to stuff the bottom corners to keep out the dust and cold drafts and yes the slide floors are cold.
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