You should install ice and water protector before other underlayments including roof felt.
Installing roof leak barriers.
When installing gaf elk leak barriers at eaves install anywhere there is the threat of a snow load most building codes require installing leak barriers at the eaves extend up the roof to at least 24 inside of the warm wall the warm wall is the interior finished wall two courses of 36 are needed on a typical structure lap second course over first by 3 using the selvage edge to keep straight and hand roll lap for adhesion purposes.
A homeowner that needs a qualified roofer that has this experience and knowledge can rest assured they are getting the best quality and workmanship out there known in the industry of.
Install the ice barrier membrane according to the manufacturer s instructions with the drip edge installed on top of the membrane.
If two courses of iko s ice and water protector are needed widthwise you should apply the bottom course first.
For safety reasons it is best only to work on the roof when all surfaces are dry.
To gain access to the roof use proper ladders or scaffolding which should also be dry to prevent slips.
Around roof features like dormers and chimneys you should place ice and water protector below flashing.
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Then install regular roofing underlayment tar paper over the top of the drip edge and over the ice barrier and continuing all the way up the roof.
Finally install the shingle mate or deck armor roof decking underlayment protection over the leak barrier that is above the transition to a minimum of 6 lap.
When installing gaf elk leak barriers at eaves install anywhere there is the threat of a snow load most building codes require installing leak barriers at the eaves extend up the roof to at least 24 inside of the warm wall the warm wall is the interior finished wall two courses of 36 are needed on a typical structure lap second course over first by 3 using the selvage edge to keep straight and hand roll lap for adhesion purposes.
From what i ve read online it seems wise to install a vapor barrier over the plywood to prevent condensation from getting absorbed into the plywood from the steel roof.
Wear soft soled shoes and follow all common safety practices when working on the roof.