diff --git a/src/main/java/io/sharedstreets/tools/builder/tiles/TiledNIOFileOutputFormat.java b/src/main/java/io/sharedstreets/tools/builder/tiles/TiledNIOFileOutputFormat.java
index 5381268..db4ac14 100644
--- a/src/main/java/io/sharedstreets/tools/builder/tiles/TiledNIOFileOutputFormat.java
+++ b/src/main/java/io/sharedstreets/tools/builder/tiles/TiledNIOFileOutputFormat.java
@@ -29,7 +29,7 @@ protected class NIOFileObject {
         NIOFileObject(String filePath) throws IOException {
 
             try {
-                stream = new FileOutputStream(filePath);
+                stream = new FileOutputStream(filePath, true);
                 channel = stream.getChannel();
             } catch(Exception ex) {
 
diff --git a/src/main/resources/conf/flink-conf.yaml b/src/main/resources/conf/flink-conf.yaml
new file mode 100644
index 0000000..e69de29