Tennessee homeowner asks how to warm cold floors, but commenters say a $300 attic fix should come first

"It's more important than the insulation itself."

A Tennessee homeowner searching for the lowest-cost way to make cold floors feel warmer first looked toward the crawlspace.

After sharing the idea in Reddit's r/Insulation forum, however, commenters steered the discussion in a different direction, recommending an attic upgrade that could be done as a do-it-yourself project for about $300 to $400.

What to know

The original poster said the home is a brick house in East Tennessee with a ventilated crawlspace that is not insulated and has "some type of vapor barrier underneath." They also said the attic has only a small amount of insulation that appears to be rock wool. The homeowner added, "The floors are cold already and it's just October."

Living on one income, the homeowner asked whether a lower-cost combination of foam board at the vents, a better vapor barrier, and possibly a temperature-cutoff vent could help reduce heating bills. OP then asked, "Any thoughts on how to proceed on a very tight budget?"

Several replies quickly shifted attention upward.

One commenter said, "Start at the top. Air seal and blow in cellulose into [the] attic. Like $300-400 DIY," describing it as the cheaper first step. OP replied, "That cheap? I was expecting much more… Cellulose is better than fiberglass?"

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The commenter responded, "Not necessarily. It's what I used though. You'll need to find the link on Home Depot and calculate based on what it says."

Some commenters did not overlook the area below the house. One wrote that "Air sealing the floor from the crawlspace side is super important," and recommended sealing the rim joists before adding insulation under the floor.

Even so, the clearest consensus was about order of operations: seal air leaks before adding more insulation. As one commenter put it, "Before you blow in more google air sealing and do that. It's more important than the insulation itself."

In this situation, beginning with an attic top-off rather than crawlspace encapsulation-style work could keep the upfront cost much lower.