diff --git a/initcpio/hooks/miso b/initcpio/hooks/miso
index e4b1d1d..99b1352 100644
--- a/initcpio/hooks/miso
+++ b/initcpio/hooks/miso
@@ -41,8 +41,8 @@ _mnt_overlayfs() {
     local src="${1}"
     local newroot="${2}"
     local mnt="${3}"
-    local work_dir="/run/miso/cowspace/work"
-    local upper_dir="/run/miso/cowspace/upper"
+    local work_dir="/run/miso/overlay_root/work"
+    local upper_dir="/run/miso/overlay_root/upper"
 
     mkdir -p "${upper_dir}" "${work_dir}"
 
@@ -124,6 +124,7 @@ run_hook() {
     [[ -z "${dm_snap_prefix}" ]] && dm_snap_prefix="arch"
     [[ -z "${misodevice}" ]] && misodevice="/dev/disk/by-label/${misolabel}"
     [[ -z "${cow_spacesize}" ]] && cow_spacesize="256M"
+    [[ -z "${overlay_root_size}" ]] && overlay_root_size="75%"
 
     if [[ -n "${cow_label}" ]]; then
         cow_device="/dev/disk/by-label/${cow_label}"
@@ -207,6 +208,11 @@ miso_mount_handler() {
     fi
     mkdir -p -m 0700 "/run/miso/cowspace/${cow_directory}"
 
+    rw_branch_size="75%"
+    msg -n ":: Mounting overlay root (tmpfs) filesystem, size=${overlay_root_size}..."
+    mkdir -p /run/miso/overlay_root
+    mount -t tmpfs -o "size=${rw_branch_size}",mode=0755 overlay_root /run/miso/overlay_root
+
     local src="/run/miso/bootmnt/${misobasedir}/${arch}"
     local dest_sfs="/run/miso/sfs" dest_img="/run/miso/img"
     local lower_dir
diff --git a/initcpio/hooks/miso_aufs b/initcpio/hooks/miso_aufs
index 8f20d92..32d7ae6 100644
--- a/initcpio/hooks/miso_aufs
+++ b/initcpio/hooks/miso_aufs
@@ -129,6 +129,7 @@ run_hook() {
     [[ -z "${dm_snap_prefix}" ]] && dm_snap_prefix="arch"
     [[ -z "${misodevice}" ]] && misodevice="/dev/disk/by-label/${misolabel}"
     [[ -z "${cow_spacesize}" ]] && cow_spacesize="256M"
+    [[ -z "${overlay_root_size}" ]] && overlay_root_size="75%"
 
     if [[ -n "${cow_label}" ]]; then
         cow_device="/dev/disk/by-label/${cow_label}"
@@ -212,7 +213,11 @@ miso_mount_handler() {
     fi
     mkdir -p -m 0700 "/run/miso/cowspace/${cow_directory}"
 
-    local work_dir="/run/miso/cowspace"
+    msg -n ":: Mounting overlay root (tmpfs) filesystem, size=${overlay_root_size}..."
+    mkdir -p /run/miso/overlay_root
+    mount -t tmpfs -o "size=${overlay_root_size}",mode=0755 overlay_root /run/miso/overlay_root
+
+    local work_dir="/run/miso/overlay_root"
     _mnt_overlayfs_root "${work_dir}" "${newroot}" "/"
 
     local src="/run/miso/bootmnt/${misobasedir}/${arch}"
diff --git a/initcpio/script/miso_shutdown b/initcpio/script/miso_shutdown
index fb7ed11..8cb05a2 100644
--- a/initcpio/script/miso_shutdown
+++ b/initcpio/script/miso_shutdown
@@ -20,10 +20,6 @@ done
 # Unmount the space used to store *.cow.
 umount /oldrun/miso/cowspace
 
-if [[ -d /oldrun/miso/img ]];then
-    umount /oldrun/miso/img
-fi
-
 # Unmount boot device if needed (no copytoram=y used)
 if [[ ! -d /oldrun/miso/copytoram ]]; then
     if [[ -d /oldrun/miso/img_dev ]]; then