From Avalara LandedCost, by the LandedCost Research Team, updated June 1, 2017.
This page provides an overview of the basic import duty rates applied to goods that fall under the classification code 6811401010 in El Salvador. This product category is defined to include:
"Corrugated sheets for roofs or other works. (free trade single via panama to costa rica)."
El Salvador is involved in a total of 1 trade agreement, and is associated with 3 country groups.