Is Tyvek Necessary Under Vinyl Siding

Installing foam board insulation under vinyl siding today.

Is tyvek necessary under vinyl siding.

Faq s acronym s terminology to tyvek or not to tyvek that is the question. Customer just called on a 2001 town home i inspected two weeks ago. Short answer is yes it is absolutely necessary if installing vinyl siding. Tyvek under 1 4in foam for vinyl siding.

Hi im a new inspector and could use some advice. Use tyvek over building felt under siding. Builder omits house wrap under siding. Our house was built about seven years ago.

House wrap is indeed considered a necessity by the majority of contractors as well as housing authorities including local building and planning departments. She asked me if she should still buy the house if a moister barrior was not present. It seems that we have two options. The irc 2000 code and our building dept.

One would be to remove the siding wrap the house and then reside it. Proper installation under each façade is essential to ensure tyvek provides the maximum level of air infiltration resistance and bulk water holdout. Yes dupont tyvek wb can be used under any façade including brick stucco vinyl cedar siding metal and stone. She had heard from a neiborhood forum that some of the houses in that neighbor hood did not have any moister barrier behind the siding.

The contractors had installed foam board on most of the house before i asked why they hadn t installed the tyvek we asked for and have in the contract. It s coming in your house. I want to replace the tar paper but i can t find it at homedepot or lowes. In order for insulation to really do its job it needs to be in direct contact with what it is insulating.

Tyvek is like skin for your house. Tyvek is designed for new homes only. Water does and will get behind your vinyl siding. That being said the foam should be put on first and left untaped.

I had wrote up a lot of issues with this house because it. During a recent repair to our siding we found that the house had no building wrap tyvek under the siding. I have read mixed things on tyvek that its needed its not its only for new houses it should go over foam under foam over or under based on climate it doesn t. Perhaps recent damage to their siding showed no house wrap under their vinyl or they are working with a contractor who doesn t believe house wrap to be necessary.

In fact many builders disagree on the effectiveness of house wraps altogether and while some builders will only install 15 pound asphalt saturated felt paper underneath exterior siding others swear by plastic fabric house wraps such as typar or tyvek. That said adding 1 2 to 1 of foam insulation board over sheathing and under siding will do much much. Tyvek is not designed as a product for older homes.