diff --git a/example/templates/empty.tpl b/example/templates/empty.tpl
new file mode 100644
index 0000000..3f1411c
--- /dev/null
+++ b/example/templates/empty.tpl
@@ -0,0 +1,10 @@
+{extends file='TplCore:empty.tpl'}
+{block name="navbar-extra-content"}
+<form class="d-flex" role="search" action='item'>
+  <div class="input-group input-group-sm me-2">
+    <input class="form-control" type="search" name="pattern"
+      placeholder="{t}Search{/t}" aria-label="{t}Search{/t}">
+    <span class="input-group-text"><i class="fa fa-search" aria-hidden="true"></i></span>
+  </div>
+</form>
+{/block}
diff --git a/src/Tpl.php b/src/Tpl.php
index fed282f..685c8f1 100644
--- a/src/Tpl.php
+++ b/src/Tpl.php
@@ -160,6 +160,7 @@ class Tpl {
     self :: $smarty->setTemplateDir(self :: $core_templates_directory);
     self :: $smarty->setCompileDir($templates_c_dir);
     self :: $smarty->registerResource('Tpl', new TplSmartyResource());
+    self :: $smarty->registerResource('TplCore', new TplSmartyResource(true));
     $debug_ajax = App::get('templates.debug_ajax', null, 'bool');
     self :: $_debug_ajax = boolval($debug_ajax);
     Log :: register_fatal_error_handler(array('\\EesyPHP\\Tpl', 'fatal_error'));
@@ -617,10 +618,13 @@ class Tpl {
   /**
    * Resolve templates path against registered templates directories
    * @param string $path
+   * @param bool $core_only Core only mode (optional, default: false)
    * @return string|false
    */
-  public static function resolve_templates_path($path) {
+  public static function resolve_templates_path($path, $core_only=false) {
     foreach(array_keys(self :: $templates_directories) as $dir) {
+      if ($core_only && $dir != self :: $core_templates_directory)
+        continue;
       $fullpath = "$dir/$path";
       if (file_exists($fullpath)) {
         Log::trace('Templates file "%s" resolved as "%s"', $path, $fullpath);
@@ -635,11 +639,12 @@ class Tpl {
   * Return the content of a Smarty template file.
   *
   * @param string $template The template name (eg: base.tpl)
+  * @param bool $core_only Core only mode (optional, default: false)
   *
   * @return string The content of the Smarty template file
   **/
-  public static function get_template_source($template) {
-    $path = self :: resolve_templates_path($template);
+  public static function get_template_source($template, $core_only=false) {
+    $path = self :: resolve_templates_path($template, $core_only);
     if (!is_readable($path)) {
       // No error return with Smarty3 and highter because it's call
       // template name in lower first systematically
@@ -653,11 +658,12 @@ class Tpl {
   * template file.
   *
   * @param string $template The template name (eg: empty.tpl)
+  * @param bool $core_only Core only mode (optional, default: false)
   *
   * @return int|null The timestamp of the last change of the Smarty template file
   **/
-  public static function get_template_timestamp($template) {
-    $path = self :: resolve_templates_path($template);
+  public static function get_template_timestamp($template, $core_only=false) {
+    $path = self :: resolve_templates_path($template, $core_only);
     if (is_file($path)) {
       $time = filemtime($path);
       if ($time)
diff --git a/src/TplSmartyResource.php b/src/TplSmartyResource.php
index 808e366..64875f5 100644
--- a/src/TplSmartyResource.php
+++ b/src/TplSmartyResource.php
@@ -11,10 +11,17 @@ use Smarty_Resource_Custom;
  */
 class TplSmartyResource extends Smarty_Resource_Custom {
 
-  // prepared fetch() statement
-  protected $fetch;
-  // prepared fetchTimestamp() statement
-  protected $mtime;
+  // Core only templates
+  protected $core_only;
+
+  /**
+   * Constructor
+   * @param bool $core_only Core only mode (optional, default: false)
+   * @return void
+   */
+  public function __construct($core_only=false) {
+    $this -> core_only = $core_only;
+  }
 
   /**
    * Fetch a template and its modification time
@@ -25,8 +32,8 @@ class TplSmartyResource extends Smarty_Resource_Custom {
    * @return void
    */
   protected function fetch($name, &$source, &$mtime) {
-    $source = Tpl :: get_template_source($name);
-    $mtime = Tpl :: get_template_timestamp($name);
+    $source = Tpl :: get_template_source($name, $this -> core_only);
+    $mtime = Tpl :: get_template_timestamp($name, $this -> core_only);
   }
 
   /**
@@ -39,6 +46,6 @@ class TplSmartyResource extends Smarty_Resource_Custom {
    * @return integer timestamp (epoch) the template was modified
    */
   protected function fetchTimestamp($name) {
-    return Tpl :: get_template_timestamp($name);
+    return Tpl :: get_template_timestamp($name, $this -> core_only);
   }
 }