Use the line tool to draw a vertical edge from the midpoint of your roof to the angled guide you created in step 2.
													
																	How to add a roof to an interior sketchup. 
									
	
		
	
																	This video features the push pull move and offset tool. 
																	2 use the protractor tool to create an angled guide at the corner of your roof. 
																	Erase the vertical edge you drew in step 3 and the guide you drew in step 2. 
																	Easily creates roofs with various parameters in sketchup plugin name. 
															
													
									
	
		
	
																	Watch this tutorial to find out how to make a basic roof in google sketchup the easy to use 3d modelling tool. 
																	Push pull back your triangular gable. 
																	For example a 4 12 pronounced 4 in 12 roof slope rises 4 feet for every 12 feet it runs a 1 12 slope is very shallow and a 12 12 slope is very steep when using the protractor tool sketchup s measurements box understands angles. 
																	Architects and builders often express angles as rise over run ratios.