Specification

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Tyvek

Homewrap

Makes Your

Insulation Work Better!

How insulation works

Trapped air is an excellent insulator—as long as the

air is NOT MOVING. Good examples of trapped air

acting as an insulator, keeping what’s inside warm or

cold, are the double pane windows in your home or the

two container construction of a Thermos

bottle.

Wall insulation works the same way. As long as the

air inside the insulation stays still and dry, the

insulation works to its rated R-value. The result is a

comfortable home.

But, an average 2,500 square foot home has more than

a 1⁄2-mile of cracks and crevices in the wall cavity,

and if the wind blows even a little (and it blows, on

average, 8 mph across the US), air is forced into

your home. Your heater or air conditioner will run

more often to keep you comfortable, resulting in

higher energy bills.

How Tyvek

HomeWrap

works

For 15 years, DuPont

™

Tyvek

has made over 2

million homes more energy efficient and more

comfortable. Tyvek

reduces the movement of air

into your home and also helps keep water (from

driving rain, for example) out of your walls. Tyvek

HomeWrap

can breathe, too (like Gore-Tex

clothing). This means that, if moisture does get

inside your walls, Tyvek

lets it pass through to the

outside. Helping to keep air and water out; letting

moisture vapor pass through—it’s the perfect way

to keep you comfortable year round.

How can you prevent air and moisture

from getting inside your home?

Use Tyvek

HomeWrap

weatherization system

underneath your siding, stucco or brick.

K05038.qxp 8/23/08 2:50 PM Page 1

Summary of content (2 pages)

PAGE 1
Tyvek® Homewrap® Makes Your Insulation Work Better! How insulation works Trapped air is an excellent insulator—as long as the air is NOT MOVING. Good examples of trapped air acting as an insulator, keeping what’s inside warm or cold, are the double pane windows in your home or the two container construction of a Thermos® bottle. Wall insulation works the same way. As long as the air inside the insulation stays still and dry, the insulation works to its rated R-value. The result is a comfortable home.
PAGE 2
How Tyvek® and Insulation Work Together The average wall has 3-1/2 inches of insulation which, under ideal conditions, has an installed Rvalue of R-14. (Installed R-value includes the whole wall system, with studs, sheathing board, insulation and siding, and takes wind movement into account.) Tests have shown that, when outside air moves into the wall through any tiny crack or crevice resulting from normal construction practices, the insulation can lose up to 63% of its installed R-value.