Reroof est,roof has 3on12 pitch will need to use ice and water shield underlayment another section has 2on12 pitch that are need either Modified Bitumen torch down membrane or self adhered type ,painted steel drip edge,and we will not use dimensional shingles with the 3on12 pitch will install 3 tab shingles Six nails per shingle and roof cement down starter shingles to the drip edge You may not know dimensional shingles are two shingles laminated together Three tab works better on lower pitch
