Install a course along the snapped line then install succeeding courses using a guide or a snapped line.
How to extend roof sheathing on an already shingled roof.
Get your gutters cleaned.
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It spans the rafters to support the roofing and in the case of panel sheathing such as plywood or osb it acts as a diaphragm with the walls to resist horizontal loads.
You can extend your asphalt shingle roof s lifespan if you can keep it in good condition and quickly handle any issues it develops.
Here s a guide to what you can do as a homeowner to make your current roof last as long as possible.
Installing a new roof over an existing one also called a layover or nailover is often possible although not always the best option.
Install roof shingles according to manufacturer recommendations shingle hints.
Roof sheathing attaches to the surface of the rafters or trusses to form the structural skin of the roof.
How to install a roof over an existing roof.
For best appearance use heavier weight shingles or laminated or textured.
Step 8 cut and install shingles.
If the existing roof has wavy horizontal lines you can take out the waves by snapping a horizontal line 1 2 inch below the shingle bottoms of one course.
This will provide time for roof sheathing to adjust to humidity and moisture conditions.