As energy codes become more stringent and better enforced it will become more important to properly calculate effective roof assembly U-values (R-values) for compliance. One area where effective U-values are commonly misunderstood is tapered insulation for low slope roofs or at the eaves of sloped roofs. This bulletin presents the theory and calculation methods used to develop tables of effective R-values for tapered insulation.
													Technical Bulletin
											
				
				Effective U-values (R-values) for Tapered Insulation
													Building Enclosure Consulting
																											Multiple Climates
											
				
									
																			
											LORNE RICKETTS										
																												RDH Building Science
																	
														
																			
											RYAN GREGORY										
																										
														
																			
											GRAHAM FINCH										
																												RDH Building Science
																	
						
					