But is a big help and save a lot of time because you realy have the tool what you need especial when you aré on the roof on steep leader u ser a kitchen sink etc etc sorry for my english.
													
																	Roof multi plier. 
									
		
	
	
		
	
	
		
	
	
		
	
																	And for a roof with a slope of 6 12 that number 1 118 is your roof slope multiplier. 
																	A roof pitch multiplier also known as a roof pitch factor is a number that when multiplied by the area covered by a sloped roof gives the actual area of the roof. 
																	The maths behind this number is that it is the square root of rise run 2 1. 
																	The roof pitch multiplier is responsible for giving an accurate pitch measurement of the roof. 
															
													
									
		
	
	
		
	
	
		
	
	
		
	
																	That gives you 5 590 square feet which is the actual area of the surface of the roof. 
																	Take the area of the roof s footprint say it s 5 000 square feet and multiply 5 000 by 1 118. 
																	A 2 b 2 c 2 where a is the rise of the roof b is the run of the roof and c is the rafter hypotenuse of the triangle with side lengths a and b. 
																	And that s the number you were looking for. 
															
													
									
		
	
	
		
	
	
		
	
	
		
	
																	Gerber mp600 multi plier needle nose black 47550 4 6 out of 5 stars 1 200. 
																	This makes measuring easier knowing that you are able to get the exact measurement of roofs by merely standing on the ground. 
																	Now solving for c in the equation above gives.