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Self Adhesive Flashing

Applying self adhesive flashing around windows and doors and any other vulnerable areas of the house is an effective way to prevent moisture and air infiltration. Most commonly sold in rolls of varying lengths and widths most common types are a butyl-based adhesive and those with a rubberized asphalt-based adhesive.

 

Butyl

Is more expensive but is more versatile, this type of flashing is better for extreme heat and does not have the compatibility problems of asphalt based flashing. Butyl flashing can withstand higher temperatures than asphalt for this main reason butyl is used in hotter climates.

 

Rubberized asphalt

 Is a good choice for most tasks this product performs well when equally combined with building materials containing no plasticizers. Rubberized asphalt does not have compatibility concerns with products such as polyurethane sealant, and certain roofing membranes when this asphalt product comes in contact with plasticizers a chemical reaction takes place and the adhesive liquefies compromising the flashing ability to work properly. Not all PVC causes chemical reactions although it’s a good idea to check with window manufactures to see if there windows contain plasticizers.

 

Both are great advances in the building industry especially when it comes to making windows and doors weather tight, as products are readily available choosing not to use a membrane in or around vulnerable areas of the home could prove to be disastrous. When using either product always work from the bottom up and overlap any seams by at least two inches.  




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