Do You Need Tyvek Under Siding

The irc 2000 code and our building dept.

Do you need tyvek under siding.

Installing foam board insulation under vinyl siding today. Once this is done the wrap is designed to make the home water tight in case a storm comes before the siding is finished being installed. One would be to remove the siding wrap the house and then reside it. Myself i would not consider using the siding without sheathing but that s your decision.

And either way you should use a barrier like tarpaper or tyvek underneath it. The seams should be taped and the windows and doors should be taped. You can put hardi directly on studs without sheathing but you need to use let in bracing to give structural rigidity to the walls. There is no logical reason not to have house wrap under vinyl siding and many authorities strongly agree that it should be viewed as mandatory even if your local building codes don t necessarily require it.

During a recent repair to our siding we found that the house had no building wrap tyvek under the siding. Vinyl siding is one of if not the most popular exterior cladding for residential homes. The answer happily is yes. 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.

Tyvek is not an insulation. It is an air barrier. What do you suggest that we do. It depends what you are trying to do and you give little information leaing one to guess.

Then yes it is recommended to have a tyvek type house wrap installed on your home. It seems that we have two options. 2 i don t like having tyvek seams at the corners 3 with the windows under the t1 11 5 4 trim becomes to thick could use 1x trim 4 if i install the windows over the t1 11 my only seal then is the flashing tape under the trim. If this was true than every architect and every builder all over the country should be talking about it and it should be on the plans that you can t use tyvek under cedar.

In fact the two products combined make your home super insulated from outside wind and weather. They are each right in a way. The second would be to blow insulation into the walls. If you choose to install house wrap with rigid foam generally it should go under the insulation not around it.

This explains why the house does not retain heat. There is a foam insulation product designed for.