If particleboard is used as wall sheathing, the grade mark with Type _____ or _____ should be stamped on it.

When using particleboard as wall sheathing, it is crucial to ensure that the material meets specific standards for structural integrity and performance. The grade marks with Type M-1 and M-2 indicate that the particleboard has been tested and approved for certain uses, confirming its suitability as wall sheathing.

Type M-1 and M-2 are design specifications that denote different levels of moisture resistance and physical properties. M-1 typically indicates a higher quality and performance rating, making it a suitable choice for situations where the wall may be exposed to higher moisture levels. Conversely, M-2 is used for applications that require less stringent standards but still meet the essential requirements for use as wall sheathing.

The other options refer to different contexts or materials and are not associated with wall sheathing applications for particleboard. Understanding the specific grading system helps ensure that the correct materials are selected for building projects, aligning with industry standards and promoting structural safety and longevity.