And even though it is thinner it is just as strong as felt and less resistant to ripping.
How much to overlap roofing tar paper.
Continue this for each surface of your roof.
Felt underlayment can overlap more than 2 inches to provide an adequate barrier.
If you have a vertical seam where one piece ends and another starts make the overlap at least 6 inches.
If your roof pitch is 3 12 or 4 12 multiply by 1 25.
The answer is the number of square feet of.
The overlap of 3 8 should be followed consistently for a smooth look once the shingles are installed.
Even if there s older tar paper in place you should simply rip it off and replace it.
Overlapping up to 6 inches can provide a superior felt layer.
This paper is a new and in some aspects improved material for roofing underlayment.
For roof pitches of 5 12 to 7 12 use a factor of 1 3.
Overlap top of foundation.
Step 5 secure ends.
Fit the first sheet.
When transitioning into the valley underlayment should overlap the ice and water shield previously installed along the valley by 6 8 inches.
All nails should be placed at least 12 inches away from the center of the valley.
Some roofing felts are actually glued down.
Multiply the width by the height for the square footage of each section then add the totals.
There should be no wrinkles or other spots that could catch moisture and cause problems.
Repeat this until the entire roof is covered.
Make sure the rolls overlap by at least four inches and staple them into place on the wood.
Usually 2 inches is plenty on a horizontal seam.
It s thinner lighter and a single roll can cover much more area than a similarly sized roll of felt.
This will help give you a moisture barrier on the roof.
For example if its length is 120 inches 10 ft and its width is 240 inches 20 ft the area is 28 800 square inches 200 sq ft.
Multiply the total area determined in step one by a correction factor to account for the roof pitch.
Underlayment should cover the entire roof deck.
Be sure the tar paper lies in flat strips that are absolutely smooth.
Secure the outside edges with plastic capped roofing nails at 12 inch intervals.
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.
Roll the roof paper up and over the peak.
The vertical overlap should be at least 2 feet or 24 inches.
Afterward multiply them to calculate the area.
This correction factor will take into account the greater area of the roof due to the pitch.
Measure the width and height of each section separately.
Get help to lay the first sheet onto the roof.
When unrolling the next adjacent roll allow for at least a two inch overlap.
Step 6 overlap next roll.
As long as the wood on your roof is in good condition you can go ahead and put tar paper down.
