Adhesives and Caulking
Topic 6 – Adhesives and Caulking
Adhesives
There is a wide variety of adhesives used to attach materials. The correct adhesive must be chosen based on a number of factors including material to be fastened, the base material, conditions such as temperature and moisture, as well as the method of attachment.
Glue
Used extensively in the carpentry trade, glue is extremely effective at bonding wood to wood and is also used in other applications. Glue comes in a variety of types:
Mastics
Caulking
Caulking is typically used to bridge and seal gaps between materials to prevent water infiltration and restrict air movement. When done correctly, it can vastly improve both performance and appearance. Caulking is available in a number of types, and the correct one must be chosen for each task.
Silicone – Long lasting sealant that is typically used to protect against water infiltration behind doors and windows, bathroom fixtures, and kitchen fixtures. One of the strongest adhesion, typically not paintable. Capable of lasting 12-30 years.
Most caulking is available in a variety of colours to give an inconspicuous bead. If no colour match is available, it is recommended a paintable caulking be used. When applying caulking, it is important that the joint is prepared. Ensure that the gap is clean, free of dust, and dry. When replacing existing caulking, the old caulking must be completely removed. After applying caulking, the joint must be tooled. This can be accomplished with either a specific tool or by simply using a finger to produce a nice, rounded appearance.
Review Questions
- Most types of yellow and white glue should not be used in areas subject to _______.
- What is the most common use of contact cement?
- What can happen if the incorrect mastic is used to adhere rigid insulation?
- Which type of mastic can be used in cold weather?
- How can an overly large gap be prepared for caulking?
- What are the two drying times for caulking?