Quick Answer: When Should The Plywood Be Replaced On The Roof?

Do I need to replace plywood on roof?

If you are getting a new roof, while you may not necessarily need to have the plywood decking replaced, you should have it carefully inspected by a qualified roofing contractor. The inspection should take place when the old shingles have been removed.

How do I know if my plywood is bad on my roof?

These common signs of damaged roof decking include:

  1. Visible holes in your roof.
  2. Signs of mold or mildew in your attic.
  3. Missing shingles.
  4. Roof sagging that’s visible from the exterior or interior.
  5. Curling and/or buckling shingles.
  6. Shingles that are wearing in a granular pattern.

How do I know if my plywood needs to be replaced?

Bowing or bulging: Moisture and wood rot may cause your decking to sink in or swell up. From the outside, this looks like you have a bulging or bowing spot on your roof. The shingles above this spot may not function properly. Further, the decking can eventually fall in.

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How long does roof plywood last?

You can expect the wood roof sheathing of a home to last 100+ years. Although it should last for the life of the home, roof sheathing lifespan can be shortened by moisture penetrating it from both above and below.

Can you put new plywood over old on a roof?

The new plywood will have to be nailed to the rafters or roof trusses. But, with the old plywood left in place, it will be considerably more difficult to locate the rafters to ensure proper nail placement.

How much does it cost to replace rotted wood on a roof?

Most homeowners spend between $300 and $1,200 for a roof repair, or an average of $650-$850 to fix a roof related issue. Going beyond $3,500 is possible, but at that point a replacement roof could be your best bet.

How do you repair plywood on a roof?

Follow these steps to inspect and replace your plywood.

  1. Step 1: Separate Undamaged Shingles.
  2. Step 2: Remove Damaged Shingles.
  3. Step 3: Pull Nails.
  4. Step 4: Remove Underlayment.
  5. Step 5: Replace Plywood.
  6. Step 6: Apply Roofing Felt and Replace Shingles.

Which plywood is best for roofing?

CDX is the grade of plywood most commonly used for roofing (CDX plywood means it is Construction Grade for exterior purposes).

What is the minimum thickness of roof sheathing?

Sheathing must be a minimum of 19/32-inch thick. Never affix roof sheathing with staples; 8d ring-shank nails need to be used instead. The normal thickness range for sheathing is 3/8 to 3/4 inch.

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Is half inch plywood good for roofing?

Most Common Thickness For rafters spaced 20 or more inches apart, 1/2- or 5/8-inch plywood is recommended. The most common rafter spacing is 24 inches, and 5/8-inch plywood is recommended for that. It will support roof loads for most situations and is the standard for most roof applications.

Does plywood need to be treated?

Treating plywood is required when you are placing it in an area that is exposed to the elements. Since the material is exposed protecting it will extend the life expectancy. The process requires only a few items purchased at your home store and can be accomplished by any homeowner. Apply the sealer to the plywood.

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