The underlayment is very important as a second layer of defense against the elements.
Roofing valley underlayment.
Fold the top over the roof ridge and cut the bottom along the drip edge metal.
Then install a non corrosive metal valley flashing of 24 minimum width lap successive sheets of metal flashing a minimum of 12 inches and seal laps.
Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.
The underlayment is an integral part of every valley and provides a waterproof base.
The most commonly used 15 tarpaper felt rolls out with large bubbles and wrinkles.
Make sure you use plastic cap nails to secure the synthetic underlayment staple by themselves will leak.
After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed.
Metal flashing metal flashing is a long sheet of thin metal typically aluminum or steel which protects the valley from water infiltration metal valleys are usually used when roofing with shingles slate cement tile and thick dimensional shingle that are thick and don t conform well to the valley.
Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic.
And this synthetic roof underlayment becomes famous due to its quality easy installation process and affordability.
It is also a good idea for an open metal valley.
It also tears easily and doesn t stand up to adverse weather conditions.
Certainteed manufactures the utility grade felt underlayments shinglefelt 15 shinglefelt 30 and the fiberglass reinforced felt underlayment roofers select.
Preparation of the valley with an underlayment is a critical part of your roof installation.
A strip of waterproofing shingle underlayment or wsu provides extra protection and is an essential component of woven and closed cut valleys.
All valley installations require appropriate underlayment layers.
This valley flashing material can be manufactured from any metal that will resist the effects of weather acid rain and other contaminants.
Underlayment is a popular option to protect your new house temporarily to keep the roofing subfloor etc.
Underlayments are designed for use on residential roof decks as a water resistant layer beneath roofing shingles.
The no nails in the valley thing is for cedar slate when the valley is held in by clips and is not as wide as the valley used with asphalt shingle.
Regardless of the method you choose do not drive nails within 6 inches or so of the valley center or you will provide an unwanted pathway for water.
We take care of your roof from start to finish.
With a clean valley you can lay down some peel and stick roofing membrane.
