Asphalt saturated felt starting at the eaves and lapping upper courses over lower by a minimum of 2 inches.
Roof underlayment moisture barrier installation instructions.
Roofing underlayments installation guidelines.
Here are some more generic tips for applying underlayment.
Follow all building codes applicable to your geographical region and structure type as it is considered a vapor barrier.
Slopes 2 12 up to 4 12.
8 1m wide sheet of underlayment overlapping successive sheets 20 3 4 527mm.
Starting at the eaves apply a 39 3.
Ensure that the space beneath the roof sheathing is properly ventilated before installing to avoid condensation problems.
Follow gaf leak barrier published application instructions.
On roofs with a slope of 4 12 or greater use a single layer of 15 lb.
Put fasteners at least every 8 inches.
Lay lines are provided on the product.
Leave the top portion of the paper loose.
Install two layers of roofpro underlayment apply a 20 3 4 527mm strip of underlayment parallel with and starting at the eaves.
Professional grade synthetic roofing underlayment udl30 installation instructions titanium udl30 is an air water and vapor barrier 06 perms and therefore should be installed above a properly ventilated space s.
B along the eaves and in the valleys install the leak barrier before installing deck armor roof deck protection.
Always follow safe roofing practices and osha safety requirements.
If any edge swelling occurs prior to roof underlayment installation all raised joints should be sanded flat.
Tyvek protec is a vapor barrier.
Vertical joints should lap a minimum of 4 inches and be offset by at least 6 feet in successive rows see figure 2 2 at left.
Tailor the underlayment installation to the roof asphalt felt underlayment has specific installation instructions outlined in the code book.
Some suppliers recommend staples about every 4 inches.
Overlay a second.
C along the rake install deck armor roof deck protection leaving 6 8 152 mm 203 mm minimum of the deck exposed and then install.
For synthetic underlayments it s best to follow the installation instructions provided by the product s manufacturer.
Allow sheathing to adjust to humidity and moisture conditions before shingle installation.
Use a construction stapler or a hammer.
It is recommended to follow all building codes applicable to your geographical region and structure type.
Rhinoroof u20 installation instructions rhinoroof u20 is a water and vapor barrier and therefore must be installed above a properly ventilated space s.
Remove wrinkles and flatten surface of shingle underlayment before.
According to manufacturer s instructions and tyvek.