This correction factor will take into account the greater area of the roof due to the pitch.
How much to overlap roofing tar paper.
Nail the two rolls in the overlap at 12 inch intervals.
Measure the width and height of each section separately.
However the additional overlap may alter the spacing of the felt courses relative to the sheathing creating problematic conditions for fastening the felt to the sheathing.
This will help give you a moisture barrier on the roof.
Roll the roof paper up and over the peak.
There are pre printed lines on the tar paper that help show you where to end the overlap.
Repeat this until the entire roof is covered.
Underlayment should cover the entire roof deck.
When transitioning into the valley underlayment should overlap the ice and water shield previously installed along the valley by 6 8 inches.
If your roof pitch is 3 12 or 4 12 multiply by 1 25.
Be sure the tar paper lies in flat strips that are absolutely smooth.
Multiply the total area determined in step one by a correction factor to account for the roof pitch.
Start by measuring the length and width of one side of the roof in inches.
Some roofing felts are actually glued down.
Multiply the width by the height for the square footage of each section then add the totals.
When unrolling the next adjacent roll allow for at least a two inch overlap.
Afterward multiply them to calculate the area.
Continue this for each surface of your roof.
The overlap of 3 8 should be followed consistently for a smooth look once the shingles are installed.
Make sure the rolls overlap by at least four inches and staple them into place on the wood.
This paper is a new and in some aspects improved material for roofing underlayment.
It s thinner lighter and a single roll can cover much more area than a similarly sized roll of felt.
Fit the first sheet.
Even if there s older tar paper in place you should simply rip it off and replace it.
Get help to lay the first sheet onto the roof.
Step 5 secure ends.
If you have a vertical seam where one piece ends and another starts make the overlap at least 6 inches.
Usually 2 inches is plenty on a horizontal seam.
The answer is the number of square feet of.
There should be no wrinkles or other spots that could catch moisture and cause problems.
Step 6 overlap next roll.
Overlapping up to 6 inches can provide a superior felt layer.
Felt underlayment can overlap more than 2 inches to provide an adequate barrier.
Secure the outside edges with plastic capped roofing nails at 12 inch intervals.
The vertical overlap should be at least 2 feet or 24 inches.
As long as the wood on your roof is in good condition you can go ahead and put tar paper down.
For roof pitches of 5 12 to 7 12 use a factor of 1 3.
And even though it is thinner it is just as strong as felt and less resistant to ripping.
