49. A structural concrete roof deck is to have insulation board installed by adhesion with hot asphalt. Before installing the insulation board, the concrete deck should be
Answer: B
The concrete deck should be primed before installing the insulation board.
Priming the concrete deck is essential to ensure proper adhesion when installing the insulation board with hot asphalt. This process enhances the bond between the concrete and the insulation, promoting durability and effectiveness.
A) acid washed.
Acid washing the concrete deck is not a necessary step before installing insulation board. This process could potentially damage the surface or alter its properties, which may hinder the adhesion required for the hot asphalt application.
B) primed.
Priming the concrete deck is the correct procedure as it creates a suitable surface for the adhesive. The primer improves the bonding characteristics, facilitating a secure attachment between the insulation board and the concrete.
C) sanded.
Sanding the concrete deck is not required for the installation of insulation board. While it may smooth the surface, it does not provide the necessary enhancement of adhesion as priming does, and could lead to inconsistencies in the bond.
D) grouted.
Grouting the concrete deck is not relevant to the preparation for insulation board installation. Grouting is typically used to fill gaps or joints, and does not contribute to improving adhesion for the insulation application with hot asphalt.
Conclusion
Priming is the definitive step needed to prepare the concrete surface for insulation board installation, ensuring a strong and lasting bond. All other options fail to address the specific requirements for effective adhesion and may even complicate the installation process. Hence, priming is essential for achieving optimal results in this construction application.