Episode 024 1995 - 96 Season

| Foam Forms | Ironing Center | Satellite Skylight | Stair System | House Wrap | Ladder Tips | New Appliances | New Window Well | New Tubs | Aerated Concrete Blocks | Video Inventory | Bow Wrench | Kich 'N Komposter | Fiberglass Decking | Mortgage Do's and Don'ts | |

To order a Video Tape, call 1-800-TO-BUILD and ask for Episode #024.


House Wrap

Demonstrator: Well, Tyvek is designed to be your secondary weather membrane. It's designed to go on top of your sheathing, on top of your OSB boards, your foams boards, or directly on top of the studs. It's designed to do basically three things. It's designed to stop air infiltration to protect your insulation's R-value. It's designed to stop bulk water intrusion to protect moisture from getting into and ultimately damaging the interior of the wall cavity, but one key feature that's unique to Tyvek is its high degree of vapor permeability. It allows the moisture that does get into the wall cavity from the interior to escape out of the house. So it's an extremely breathable product. It is not a vapor barrier.

Michael Holigan: And most people don't understand that you put thousands of gallons of water inside your house every year from steam from showers, cooking, just from talking back and forth. You need to let than moisture out of the house and not trap it inside.

Demonstrator: Exactly.

M.H.: It looks like here Scott that you're showing how it prevents air infiltration from the exterior. Describe for us what we have here.

Demonstrator: What this unit's showing us here, is it basically with fiberglass, you do not have an air infiltration barrier. Air can easily move through. By introducing an air source at the bottom of the unit, we're readily moving air through the fiberglass, which ultimately reduces it's effective R-value when installed in your wall system.

M.H.: Yeah it looks like here on your sheet it goes from an R-14 down to a R-5 once the air starts going through.

Demonstrator: That's exactly right. Basically you can see up to 63 percent reduction, and we've done that through independent labs, in the effective R value of your wall systems.

M.H.: Yeah you can definitely see the balls moving from the air blowing through and over here they're not. What's the difference?

Demonstrator: Basically with the Tyvek introduced into the system, you're preventing that air from moving into the wall cavity and it's noted by the lack of the ball movement, that can be the outlet in your house. It's not getting that draft through, that coolness that you might feel or that heat that comes in your air conditioning periods.

Episode 024 1995 - 96 Season

| Foam Forms | Ironing Center | Satellite Skylight | Stair System | House Wrap | Ladder Tips | New Appliances | New Window Well | New Tubs | Aerated Concrete Blocks | Video Inventory | Bow Wrench | Kich 'N Komposter | Fiberglass Decking | Mortgage Do's and Don'ts | |

To order a Video Tape, call 1-800-TO-BUILD and ask for Episode #024.