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Old 08-20-2011, 09:31 PM   #1
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We are installing new vinyl siding. Currently have 1 1/2" foam insulation, should we add tyvek prior to installing the "new" vinyl siding?

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Old 08-20-2011, 09:38 PM   #2
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can't hurt

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Old 08-21-2011, 08:18 AM   #3
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Seems a waste of money if you taped the joints on the foam insulation.
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Old 08-21-2011, 08:24 AM   #4
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it's not that much money and redundancy is sometimes a good thing
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Old 08-21-2011, 10:00 AM   #5
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Hi!
This from the "Vinyl Siding Institute", installation manual -

Water-Resistive Barrier

Vinyl siding has always been designed as an exterior cladding, not a water-resistive barrier.
Vinyl siding is designed to allow the material underneath it to breathe; therefore, it is not a
watertight covering. Because of its design and application, it provides a supplemental rain screen
that enhances the water-resistive barrier system by reducing the amount of water that reaches the underlying water-resistive barrier.
What Is a Water-Resistive Barrier System? It is a system that includes water shedding materials and water diversion materials.

Water-resistive barrier systems commonly consist of a combination
of exterior cladding, flashed wall openings and penetrations, water-resistive barrier material, and
sheathing. Effective water-resistive barrier systems will shed the water initially, control moisture flow
by capillary and diffusion action, and minimize absorption into the wall structure. The level of water
resistance required is determined by the applicable building code and structure.
Best Practice: To achieve designed performance, vinyl siding must be installed over a water-resistive
barrier system that includes 1) a continuous water-resistive material and 2) properly integrated flashing
around all penetrations and where vinyl siding interfaces with other building products such as brick,
stone, or stucco. Refer to the manufacturer’s instructions for specific product applications and recommendations.
Whichever product(s) you decide to use as part of a water-resistive barrier system, be
certain the materials meet the applicable building code by contacting the manufacturer of the waterresistive barrier material(s).
Always consult the applicable building code for minimum water-resistive
barrier requirements in your area. Keep in mind that additional measures may provide better protection
against water intrusion than the minimum requirements of the building code.

Follow "Tom Struble's" advice.

rossfingal

Last edited by rossfingal; 08-21-2011 at 10:02 AM.
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