Damaged shingles and rotted plywood must be removed before replacing them with new plywood and roofing material.
Replace plywood and section of roof.
Replace the roof decking select plywood or oriented strand board that is the same thickness as the wood you are replacing.
Although the plywood typically lasts longer than most shingles and roof coverings leaks can cause them to rot.
Rotted plywood is identifiable by sinking areas of the roof or visible leaks.
And while nobody likes having to pay to replace a roof the critical and aesthetic function it serves should help ease the pain of spending 8 000 to 20 000 on the work.
If not climb the roof and measure the opening so you can cut the replacement piece to be a perfect fit.
Locate the rotted roof decking.
Stagger the sheathing in a brick pattern for extra strength.
Look up at the roof area.
Measure the opening of the section of roof to be shingled cut the plywood to size and nail to roof rafters.
Note bad areas for removal.
Roof with asphalt shingles on a 2 story roof with chimney.
Eight foot 1 2 inch thick plywood is standard sheathing material.
If you were able to keep the removed section in one piece measure it.
Roofs are framed with rafters or trusses which are rafters joined by internal braces so they install as a single component.
Additional cost for damaged sheets of plywood assuming the underlying rafters or trusses are not rotted too normally are not significantly damaged unless the plywood is literally fallin gapart generally about 40 70 sheet installed unless you have 3 4 exterior sheathing in which case more like 70 100 sheet installed.
After all it keeps water out of the building.
Average cost to have roofing replaced is about 5 250 10 500 replacing a 1 500 sq ft.
After cleaning the debris and reframing the roof lay down a base sheathing.
Gain access to the attic to inspect the plywood or roof decking.
The minimum plywood for roofing.