diff --git a/book/_toc.yml b/book/_toc.yml
index 0a80569..e7074f7 100644
--- a/book/_toc.yml
+++ b/book/_toc.yml
@@ -31,7 +31,7 @@ parts:
       - file: design_workflow/general_loads/variable_loads_2_wind
       - file: design_workflow/general_loads/variable_loads_3_rain_snow
       - file: design_workflow/general_loads/variable_loads_4_special
-      - file: design_workflow/general_loads/deflection_requirements
+      - file: design_workflow/general_loads/deformation limits
     - file: design_workflow/general_mechanics/general_mechanics
       sections:
       - file: design_workflow/general_mechanics/symbols
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diff --git a/book/design_workflow/general_loads/deflection_requirements.ipynb b/book/design_workflow/general_loads/deflection_requirements.ipynb
index 47eb913..3ff3cdd 100644
--- a/book/design_workflow/general_loads/deflection_requirements.ipynb
+++ b/book/design_workflow/general_loads/deflection_requirements.ipynb
@@ -4,7 +4,110 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Deflection requirements"
+    "# Deformation limits"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Vertical deformation\n",
+    "\n",
+    "$w_c$ = precamber  \n",
+    "$w_1$ = initial deflection under permanent actions  \n",
+    "$w_2$ = long term deflection under permanent actions (creep)  \n",
+    "$w_3$ = deflection under variable actions  \n",
+    "$w_{tot} = w_1 + w_2 + w_3$  \n",
+    "$w_{max}= w_{tot}-w_c$  \n",
+    "\n",
+    "```{figure} Images/Deformation.jpg\n",
+    "---\n",
+    "scale: 100%\n",
+    "---\n",
+    "```"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "```{note}\n",
+    "As Eurocode does not specify deformation limits, the old limits\n",
+    "originating in the Dutch code are used (NEN 6702 Belastingen en vervormingen TGB 1990).\n",
+    "```"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Floors in general                   $w_3 = 0,003 * l$  \n",
+    "Floors carrying non-flexible walls  $w_3 = 0,002 * l$  \n",
+    "Roofs                               $w_3 = 0,004 * l$  \n",
+    "Maximum deflection                  $w_{max} = 0,004 * l$  "
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Water accumulation\n",
+    "\n",
+    "Even if the drainage systems works properly there is a possibility of water accumulation.\n",
+    "To prevent this, the roof must be designed stiff enough to ensure the remaining slope of\n",
+    "the roof at the lowest support stays positive. It is therefore recommended to design for a minimum slope of 1,6%.\n",
+    "\n",
+    "```{figure} Images/Water accumulation.jpg\n",
+    "---\n",
+    "scale: 100%\n",
+    "---\n",
+    "```\n",
+    "\n",
+    "```{figure} Images/Water accumulation 2.jpg\n",
+    "---\n",
+    "scale: 100%\n",
+    "---\n",
+    "Too large deformations leading to water accumulation and eventually failure.\n",
+    "```"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Horzintal deformations\n",
+    "\n",
+    "As Eurocode does not specify deformation limits, the old limits\n",
+    "originating in the Dutch code are used (NEN 6702 Belastingen en\n",
+    "vervormingen TGB 1990).\n",
+    "\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Low rise\n",
+    "\n",
+    "$u <= 1/150*h$ for industrial buildings  \n",
+    "$u <= 1/300*h$ for other buildings\n",
+    "\n",
+    "```{figure} Images/Low rise deformation.jpg\n",
+    "---\n",
+    "scale: 100%\n",
+    "---\n",
+    "```\n",
+    "\n",
+    "### High rise\n",
+    "\n",
+    "$u <= 1/300*h$ for storey height  \n",
+    "$u <= 1/500*h$ for total height\n",
+    "\n",
+    "```{figure} Images/High rise deformation.jpg\n",
+    "---\n",
+    "scale: 100%\n",
+    "---\n",
+    "```"
    ]
   },
   {