Installing a roof is much more than just nailing shingles onto some boards.
Proper roof underlayment installation.
It starts with installing solid decking usually plywood or oriented strand board but that is not waterproof.
Ideally the roof covering material would be installed as soon as possible but in reality the roof may be protected by only the underlayment for days weeks or sometimes months.
Synthetic roofing underlayment installation guidelines and safety precautions.
Fall protection devices should always be used when working on roofs.
Underlayment flashings and shingles all work together and must be installed in the correct order.
Cut the membrane into 10 to 15 foot lengths and re roll loosely.
Appropriate personal safety equipment and work.
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Do not use felt as a temporary protection against rain.
If you lay the felt perfectly straight you can use its lines instead of horizontal chalklines to align the shingles.
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Install baffles providing a minimum of 1 inch of clear space between framing and or under roof decking at eaves to ensure that ceiling or roof insulation does not block ventilation paths.
Observe and comply with all osha and other safety standards and codes that apply to roof safety.
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Roof underlayment prevents the roof deck from being exposed to the elements before or while the roofing material is being installed.
There are two easy ways to install self adhering roofing underlayments correctly.
For vaulted or cathedral roof construction provide a free ventilation path from eaves to ridge between all rafters.
However while a self adhered underlayment is a significant leg up against harsh conditions if it is not properly installed the roof is still vulnerable to leaks.