Change
<div
  id="loc-name"
></div>
<div
  id="loc-phone-number"
></div>

<script>
  window.onload = function() {
    // Retrieve the value from sessionStorage
    var locationNumber = sessionStorage.getItem('location_phone_number');

    // Check if the value is not null
    if (locationNumber) {
      // Set the inner HTML of the div to a clickable link with tel href
      document.getElementById('loc-phone-number').innerHTML = '<a href="tel:' + locationNumber + '">' + locationNumber + '</a>';
    }
  };
</script>

Generally, yes. Metal roofs tend to require less frequent maintenance than most other roofing materials. That said, staying ahead of emergencies still means watching for rust and corrosion, tightening loose fasteners and seams, keeping the surface clear of debris, and making sure water drains properly off the roof.