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All it takes is a quick peek to find out. If your attic floor is insulated but the wood beams (joists) are still visible, you probably don't have enough. But even if you can't see your beams, that's still no guarantee that you have enough insulation. The best thing to do is measure. For maximum energy efficiency, we recommend an insulation value of R-60 for attic floors - about 18 inches of insulation. Do you have enough? To find out your current R-value, and how much more insulation you need, use our Insulation Calculators.
Roof ice dams are
formed when heat from the inside of a home escapes into the attic
and warms the roof decking during the winter. This heat, combined
with heat from the sun, can melt snow on the roof. Melting snow then
runs down toward the eaves as water. When it reaches the cold
eaves and gutters it refreezes. This continual thaw and re-freeze
process creates ice dams. The result is water backing up under the
roof shingles where it can soak through the roof decking or
wall sheathing, causing damage to attics, ceilings and walls.
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There are three ways to defend against the damage ice dams cause: attic insulation, attic ventilation system, and water-proofing shingle underlayment. All three work together.

ENERGY STAR labeled windows, doors, and skylights are twice as efficient as the average windows manufactured just 10 years ago. They help cut your heating and cooling costs and can make your home more comfortable without compromising cost, comfort, versatility, or style. These high-performing windows are available in every operator type, including single- and double-hung, casement, horizontal slider, fixed, picture, and patio slider. And, replacing old windows and doors is one of the best investments for your home averaging a 91.6% return