FenestrationMaster: 2.0 - Group 3 Flashcards
The difference between weather strip and weather seals is:
Weatherstrip is installed in a retaining groove of the window or door.
Weatherseal is applied using kerfs, t-slots, pockets or other retaining profiles.
Describe the trade-offs in the use of weatherstrip:
Pile height provides a better seal, but if too high can lead to excessive operating force.
What 3 factors must be considered in the selection of a sealant joint system?
Hint: ALE
Aesthetics
Longevity
Ease of Repair
Sealant system failures are often related directly to what factors:
Improper sealant
faulty application
inadequate system design.
Special measures that may be required to obtain adequate sealant adhesion include
abrasion
primer or surface treatment.
Environmental conditions that impact external sealant applications include:
UV radiation
Water contact
temperature fluctuations
pollutants
UV Exposure is magnified by internal reflection from the glass surfaces via what three pathways:
Direct Exposure
Exposure through the glass
‘Bounce-Back’ exposure
Sealant Durability Test requires 3 primary steps, including:
7 day immersion in water
7 day heat aging under compression
Cycled compression and extension at room temp, high temp and low temp.
In the broadest sense, there are three types of sealant systems into which all materials may be organized. What are they
Dry (tapes or gaskets)
Wet (gunnable or pumpable products)
Combination of wet and dry.
Tape-type sealants used in fenestration fabrication fall into three basic types:
Pre-formed
Cellular Foam
Precompressed Cellular
Preformed sealant tapes include what two material types?
Extruded polymer-based compounds
Cured cellular materials with adhesive
Cellular Foam sealant are typically what shape and how do they work.
Square or rectangle. They are resilient and seal by compressing and preventing water from flanking around the material.
Wet Sealants appear in two grades
Gunnable, Non-Sag
Self-leveling Grade (slump greater than 1/10”)
Name 8 considerations for sealant design and selection for fenestration systems
Adhesion Cohesion Hardness Elasticity (Elongation or Compression and recovery) Compatibility Environmental effects Appearance Durability .
Sealant performance requirements are set forth in what AAMA standard
AAMA 800
Cohesive strength is defined as;
The ability of a sealant to hold together and not tear within the material itself.
Adhesive strength is defined as:
The ability of a sealant to remain bonded to a substrate material.
Vehicle Migration (in sealants) is defined as:
Indication of the degree of separation of compound components.
