Are tar paper and Tyvek a vapor trap?
Can you please set me straight because I am getting different points of view on this. My home is 40 years old, has the old type of sheathing, a layer of tar paper and then T1 11 siding. In patching one side of the house, I have put 1/2 inch foam board over the T1 11 and then Tyvek. Is this a vapor trap? If so, what part of it is?
Is the use of tar paper and then a layer of Tyvek on the outside of the T1 11 a vapor trap?
Is the use of rigid foam board a vapor trap?
Thanks so much!