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

Rationale

The concrete deck should be primed before installing the insulation board.

Priming the concrete deck enhances the adhesion of the insulation board to the surface, ensuring a secure bond when the hot asphalt is applied. This step is crucial for achieving optimal performance and longevity of the roofing system.

A (acid washed.) YOUR ANSWER

Acid washing is typically used to clean surfaces and remove contaminants, but it is not a necessary step specifically for preparing a concrete deck for insulation board installation. While it can improve surface conditions, it does not promote adhesion as effectively as priming does.

B (primed.) CORRECT

Priming creates a suitable surface for adhesion by sealing the concrete and providing a consistent texture. This preparation allows the hot asphalt to bond effectively with the insulation board, reducing the risk of future delamination and ensuring the roof's integrity.

C (sanded.) YOUR ANSWER

Sanding the concrete deck can help to remove surface irregularities; however, it is not a standard practice for preparing a surface for insulation board installation. Sanding might create dust or debris that could interfere with adhesion rather than enhancing it.

D (grouted.) YOUR ANSWER

Grouting is used to fill gaps or voids in masonry or concrete but does not apply to the process of preparing a concrete deck for insulation. This option would not improve adhesion or surface preparation for the installation of insulation board.

Conclusion

For optimal adhesion of insulation board to a concrete roof deck using hot asphalt, priming is the essential preparatory step. This process enhances the bond between materials, leading to a more effective and durable roofing system. Other methods, such as acid washing, sanding, or grouting, do not provide the same benefits and may not contribute positively to the installation process.

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

The concrete deck should be primed before installing the insulation board.

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