Moisture Readings for Historic Buildings

Accurate moisture readings are critical for preserving the integrity of historic buildings. Moisture can cause significant damage to walls, leading to structural weakness, mold growth, and deterioration of historic finishes.

What Should Moisture Readings Be for Internal Walls?

Ideal Readings: 6% to 12%
Low Readings (Below 6%): Indicate excessive dryness, which can lead to shrinkage, cracking, and loss of paint adhesion.
High Readings (Above 12%): Suggest moisture intrusion, potentially causing mold, rot, and structural damage.

Monitoring Moisture Levels

Regular moisture readings are essential to monitor and maintain appropriate levels. This involves:

Selecting appropriate measuring devices: Pin-type or in-situ moisture meters.
Determining representative measurement locations: Areas with potential moisture sources (e.g., near plumbing, windows, or exterior walls).
Establishing baseline readings: Measure moisture levels under normal conditions.
Tracking changes over time: Identify any significant fluctuations that may indicate moisture issues.

Moisture Control Strategies

If moisture readings exceed acceptable levels, appropriate control measures must be implemented:

Identifying and repairing source of moisture: Leaky plumbing, damaged roof, or rising damp.
Improving ventilation: Installing moisture-controlled ventilation systems or opening windows for air circulation.
Using moisture-resistant materials: For repairs, restoration, or additions.
Applying moisture barriers: Waterproofing membranes or sealants to prevent moisture penetration.

By monitoring moisture levels and implementing appropriate control strategies, historic buildings can be effectively preserved and protected from moisture-related damage.