Cold floors make an otherwise welcoming house uncomfortable. Determining the cause of cold floors, however, is usually fairly simple and can be addressed without massive expenditure. Some issues are structural and logical: you can expect the stone floor of your screen porch or the basement linoleum laid on cement to be cold, and carpet is the logical warmer. Different strategies, however, are needed for floors that should be warmer than they are.
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Things you need
- Damp rag
- Plastic sheeting and rocks
- Fibreglass roll or foam slab insulation
- Heavy duty staple gun or insulation brackets
- Flexible roll insulating putty or foam spray
- Door draught strips
- Draft strip hardware and tools
- Baseboards and quarter-round or wood shoe mouldings, if missing
Perform a simple test to determine whether cold is radiating from a floor over a crawlspace. Dampen your bare hand with a wet rag and hold it 2.5 to 5 cm (1 to 2 inches) above the floor. If you can feel cold radiating toward your hand, you have found your problem.
Address the damp and cold coming up from the crawlspace by covering the entire area with a plastic ground cloth. Spread one or more pieces of heavy weight plastic sheeting and anchor it down with rocks, bricks or lumber scraps. Do not pile sheeting against the crawlspace walls or supporting pillars, and do not tape sheeting to them either. Although this seems like it would provide more insulation, it can produce moisture collection against structural surfaces and promote water damage. Loose edges allow runoff or moisture to dissipate in case of a soaking storm or thawing ground.
Measure spaces between the floor support beams and purchase roll type fibreglass or foam slab insulation to fill the spaces. Install the insulation with the moisture barrier facing the floor, not the ground. Roll insulation can be attached to beams with a heavy duty staple gun. Find brackets or use large nails, hammered into support beams, not the floor, to hold foam slab insulation in place.
Do the wet-hand test again to locate the source of draughts. Follow it up by holding a lit candle within 10 to 15 cm (4 to 6 inches) of possible draught sources. Some, like a fireplace, are obvious. Make certain the damper closes completely, and cut a piece of plywood to fit into the fireplace opening if heat loss is chronic and severe. Remove it only when you want a festive fire for a special occasion.
Weatherstrip doors that cause frequent draughts. Whether you need to do the whole door or just put a draught blocking strip at the bottom will depend on the door and the severity of the draughts. This usually requires only weatherstripping supplies from the hardware store and a hammer or screwdriver.
Examine floor edges for draughtiness. Especially in an older house, baseboards and quarter-round may have been removed to accommodate wall-to-wall carpeting. If they were not replaced, putting in new mouldings will reduce draughts noticeably. In older houses, ageing makes wood shrink and dry. Even existing floor mouldings may let draughts through. In this case, remove the mouldings carefully. Place roll-type insulating putty or a small line of spray insulation foam where the wall and floor meet. Replace the mouldings. Again, the change will be noticeable.
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