Pitched roofs can also be used to incorporate roof lights angled in a specific direction or dormer windows.
													
																	Minimum roof pitch for dormers. 
									
	
		
	
																	This type of dormer needs a roof pitch shallower than that of the original. 
																	A shed dormer on the other hand is usually had on homes with a roof pitch of at least 8 in 12 or steeper. 
																	You can also divide the rise over run multiply by 100 and get a percentage. 
																	Roofing gutters and all waterproofing anywhere minimum roof pitch i am planning a shed dormer with a roof that will have about 3 12 pitch. 
															
													
									
	
		
	
																	However rise over run is more efficient and easier to understand for the average diyer. 
																	This image shows a relatively shallow roof pitch of 15 degrees. 
																	The loft space would be much larger with a roof pitch of 45 degrees. 
																	Having a steeper pitched roof allows for more space in a shed loft. 
															
													
									
	
		
	
																	A 4 12 pitch is around 18 5 degrees but not exactly.