"We just wanted to tell you how pleased we are with the patio door that was installed and the Gutter Caps that were installed several weeks ago. The patio door looks great and we love the Gutter ... » more
- Harlan and Sandy Henzen of Davenport, Iowa


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Moisture Vapor Transmission Rate

The rate at which moisture diffuses through a substance. Generally given in the following units: grams/meters2 x 24 hours. The lower the MVT rate, the greater the resistance of the sealant to moisture penetration.

Not quite sure what the proper home improvement terms are? Let us help. We have put together a glossory for you to learn a little bit more about Home Improvement Glossary and Terms

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