Swap mortar for mechanical confidence. This kit fixes clay ridge units securely and adds discreet airflow along the apex so the line reads clean and stays stable through seasons. Also this item modernises the apex with mechanical fixing and continuous ventilation. It keeps lines crisp and maintenance low. Also From experience Swap mortar for mechanical confidence. This kit fixes clay ridge units securely and adds discreet airflow along the apex so the line reads clean and stays stable through seasons.. Also It keeps lines crisp and maintenance low.. As used on site, Swap mortar for mechanical confidence. This kit fixes clay ridge units securely and adds discreet airflow along the apex so the line reads clean and stays stable through seasons. Dry Ridge Conversion Kit for clay ridge modernises the apex with mechanical fixing and continuous ventilation. It keeps lines crisp and maintenance low. From experience Swap mortar for mechanical confidence. This kit fixes clay ridge units securely and adds discreet airflow along the apex so the line reads clean and stays stable through seasons.. This item modernises the apex with mechanical fixing and continuous ventilation. It keeps lines crisp and maintenance low…