Synthetic roofing underlayment is to be laid horizontally parallel to eave with printed anti slip side up starting at the bottom of the lowest roof eave with a 1 5 underlayment overhang at the eave covering the pre installed eave drip edge.
How to install underlayment for roofing.
Start from the top of the roof and remove the old shingles along with the flashing underlayment and vents.
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Install drip edge at the roof eave edges.
Install a layer of roofing insulation as recommended by the roofing manufacturer.
Before applying roofing you ll need to cover the sheathing with roofing felt also often called tar paper most local codes call for using 30 pound felt.
How to install felt underlayment for a new roof.
If necessary adjust how the material ls aligned to keep it hanging over the decking material.
Overhang the roof rake edge 1 5 and cover the.
Hammer down any large nails that are exposed by the removal.
Install the underlayment along the roof decking.
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Some roofers prefer to attach felt underlayment with 1 inch roofing nails or special nails with plastic washers but most codes allow staples which are easier to drive.
Inspect the underlying roof sheathing for damage and make any needed repairs.
Smooth out the underlay to prevent any bumps.
Here is a video about roofing underlayment.
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Step 5 nailing the underlayment.
Installing a roof is much more than just nailing shingles onto some boards.