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Question DetailsAsked on 3/20/2015

Residing house, should I get Tyvek or Foam

I have a 2 story house. 1st floor is brick, 2nd floor is tudor The exterior is treated/painted plywood with 1x6" trim boards. I am looking into vinyl siding. Two contractors recommend either Tyvek or Foam. the 3rd contractor does not recommend Tyvek at all. All three are reputable companies with good reviews.

So should I push for Tyvek to be installed? is the foam worth the investment?

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2 Answers


I personally would suggest both. The Tyvek is actually for moisture control and seals off the home from drafts if installed and taped correctly. The foam is just that, it is foam and is more for insulation purposes. We direct customers on most occasions to use both. Neither one costs that much in the long run, in comparison to what the jobs cost including labor.

Exterior Upgrader is owner of

Euro-Tech, Inc.

Servicing much of Illinois and Wisconsin


Answered 5 years ago by ExteriorUpgrader


You might want to ask them why they recommend or don't recommend using one or even both. They serve two completely different purposes.

The Vinyl Siding Institute's installation manual states, "Vinyl siding has always been designed as an exterior cladding, not a weather resistant barrier." The manual goes on to state, "To achieve designed performance, vinyl siding must be installed over a weather resistant barrier" and I interpret that as needing a barrier like Tyvek. There's a link on the bottom of this page to download the Vinyl Siding Institute's installation manual.

Are your exterior walls already insulated? Vinyl siding alone offers very little improvement to reducing heat loss. Adding rigid foam insulation board under the siding typically only provides an R-value of 4-7 per inch (not much), with some types losing some of that value as they age.

It may be more cost effective to insulate your attic or exterior walls instead of adding insulation to the outside of the house, under the siding.

Answered 5 years ago by RodeoMan

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