I have an apartment building that's 22 years old with asphalt shingles that are starting to fail. What are your thoughts on the 3 options a roofing contractor gave me? The decking is 1/2" OSB on 24" centers. It requires approx 100 squares.
1) Remove existing single layer of shingles and replace with new shingles.
2) Cover existing shingles with 3/4" furring strips then Galvalume ribbed metal.
Styles – Panels | Metal Roofing | Deep Creek Metal Sales
3) Cover existing shingles with a roll out barrier then standing seam metal. "
Option 1 and 2 are the most cost effective with shingles being about 10% more. The roofer just re-roofed my house, removing metal that was screwed directly to osb, installing 3/4" furring, then surface fasten metal.
Option 3 is not quite double but about 80% more.
One concern I have is laying standing seam over the shingles irregular surface (roofer say's it's not a problem). Another is will the fasteners or clips fasten securely enough into 1/2" osb?
Thoughts?
1) Remove existing single layer of shingles and replace with new shingles.
2) Cover existing shingles with 3/4" furring strips then Galvalume ribbed metal.
Styles – Panels | Metal Roofing | Deep Creek Metal Sales
3) Cover existing shingles with a roll out barrier then standing seam metal. "
Option 1 and 2 are the most cost effective with shingles being about 10% more. The roofer just re-roofed my house, removing metal that was screwed directly to osb, installing 3/4" furring, then surface fasten metal.
Option 3 is not quite double but about 80% more.
One concern I have is laying standing seam over the shingles irregular surface (roofer say's it's not a problem). Another is will the fasteners or clips fasten securely enough into 1/2" osb?
Thoughts?
