Work your way up the roof nailing down the shingles with four nails starting at one side and nailing across.
													
																	How to proceed to change scingles from the house roof. 
									
	
		
	
																	If the shingles are severely damaged don t try to salvage them. 
																	This strategy is convenient for homeowners because the replacement won t take as long or make as much of a mess. 
																	Doubling up your shingles can save time and expense on your roof replacement as your roofer doesn t need to remove and dispose of the old shingles. 
																	Loosen the adhesive underneath the tabs of the damaged shingle then pull them free and discard.