Moisture Mapping is a critical step in preparing wood surfaces for painting. It involves measuring the moisture content of wood to ensure it is within a suitable range for the application of paint.

### Wood Moisture Content and Painting

The moisture content of wood is measured as a percentage and refers to the amount of moisture within the wood fibers. When wood is too wet, paint may not adhere properly and may peel or blister. Conversely, if wood is too dry, it may absorb excessive paint, leading to cracking or warping.

### What Should the Moisture Content of Wood Be Before Painting?

The ideal moisture content for wood to be primed and painted generally depends on the type of wood, its thickness, and its intended use. However, most experts recommend that the moisture content be below 15% for interior applications and below 12% for exterior applications.

### Considerations for Different Wood Types

The following table provides approximate moisture content ranges for various types of wood:

| Wood Type | Interior Moisture Content | Exterior Moisture Content |
|————————-|—————————-|—————————|
| Softwoods (e.g., pine) | 6-8% | 9-11% |
| Hardwoods (e.g., oak) | 8-10% | 10-12% |
| Plywood | 10-12% | 11-13% |
| Composite Lumber | 6-10% | 9-11% |

### Moisture Measurement

Several methods are available for measuring wood moisture content. The most common method involves the use of a pin-type moisture meter, which measures the electrical resistance of the wood. Alternatively, a non-invasive moisture meter can be used to measure the moisture content of wood without penetrating its surface.

### Moisture Mapping Tips

* Measure the moisture content of wood in multiple locations, especially in areas with potential moisture penetration.
* Allow damp areas to dry thoroughly before painting.
* Use a dehumidifier to reduce moisture levels in the environment.
* Paint wood during dry weather conditions.
* Avoid applying paint to wood that has been exposed to rain or snow.