An Expert's Comments On Butyl Flashing
This adhesive is much more compatible with other caulks/sealants and does well in high temperatures plus sticks at lower temps than Asphalt. …..Common examples of Butyl Based flashing tapes include …..DuPont ….. This is usually a more expensive tape…..
An Expert's Comments On Typical Builder Flashing - What Others Use
Modified Asphalt based. These have been on the market since the 1970’s. This is the least cost tape in the test and the adhesive is tar-based. Because it’s oil-based it can be prone to liquefaction with high temperatures (I’ve seen black oily runs onto metal window head flashing because of this), and you need to be careful with compatibility as the petroleum can eat through some caulks, sealants, and even some WRB’s. This category has the least “tenacious stickiness” (would be a great band name) and really needs to be pinned-down in order to make it really hold fast to the building.
Your Family - Your Home - Use butyl flashing according to expert opinions.