Limiting air infiltration is one the most important aspects of creating an energy efficient house. Leaky houses use more energy to re-heat or cool the lost air. Air infiltration is often measured as Air Changes per Hour (ACH) SIP Homes are extremely tight.
Air SealingAir sealing done properly eliminates both the energy consumption and the durability problems. To meet these needs, the air sealing system must remain robust for decades, be easy to assemble on the job site (under New England’s weather conditions), and be cost-effective. Unfortunately, there doesn’t seem to be one material or solution that meets these needs for all the different types of panel joinery. Foard Panel uses 3 materials (spray foam, mastic & tape) and 4 primary methods for air sealing: “Drill and Fill”, “Gapping (for Timber Frames)”, “Panel Mastic” & “Panel Mastic Reinforced with Tape”. Each method is meant to achieve the best seal for a particular situation. What we, and most other panel installers like about these methods is that the panels are put up “dry” with air sealing done as a separate step. This makes the process cleaner, quicker, and allows for undivided attention to be given to this important job. Below is a list of eight key situations that require air sealing and the appropriate method to use.
*When foaming around installed windows/doors, use low expanding urethane foam – not the foam supplied by Foard Panel. It is possible to “blow-out” the jambs with the triple expanding foam Foard uses. ** Standard chimney openings that require clearance should not be foamed.
|1||Where wall panels meet the deck||mastic & tape|
|2||Spline and butt joints on wall and roof panels||drill and fill|
|3||Panel to panel connections @ corners||gap or mastic & tape|
|4||At intersection of wall and roof along eaves and rakes||gap or mastic & tape|
|5||At roof ridge hips and valleys||gap or mastic & tape|
|6||Behind rough opening framing||mastic|
|7||After window/door installation between jamb and r.o. blocking*||gap|
|8||At any penetrations such as vent stacks**||gap|