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How long does roof plywood last? Roof plywood should last twenty years, so long as it is not exposed to water.
Should I replace the plywood on my 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. When considering a contractor for your project, be sure to address the subject of plywood replacement, and what the cost per plank will be.
How do I know if my plywood is bad on my roof?
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.
How long does roof plywood last?
There are a few averages you can expect, but they are dependent on these factors. Plywood siding, such as T-111 should give at least a 35 year life expectancy, if finished properly; but there are many cases of it lasting over 50 years. Roof sheathing should last 30 to 40 years or to put it another way, two roofs.
How do I know if my roof sheathing is bad?
If the roofline is in any way wavy, then it means your sheathing is damaged and needs to be replaced. You can also check for sagging from the inside. Go into your attic with a flashlight, and look up. If any areas of the roof appear closer to you than others, your roof is sagging, and it is time to call a professional.
Can you put new plywood over old?
1 Answer. If the old plywood was clean and not infested with dry rot or mold it should be OK to cover it with the new plywood. One thing to consider is that the new plywood probably wants to be the same thickness as what would be used if it was used by itself on the rafters (i.e. if the old plywood had been removed).
How much does it cost to replace plywood on a roof?
The thicker the plywood your roofer uses, the more expensive the job will be. Your price could vary depending on how much the roofing company charges for labor, but generally, you can expect to spend between $70 to $100 for each sheet of plywood.
What are some common problems with roof sheathing?
Wood sheathing will eventually rot as excess moisture continually collects on it and the material is unable to properly dry out. Some signs that roof sheathing is damaged or rotted include a sagging ceiling, noticeable roof leaks and missing patches of roof shingles or tiles.
Can you put new roof sheathing over old?
Although I don’t think installing new plywood roof sheathing over the old would be a grave mistake, I would not recommend doing it, for several reasons. The new plywood will have to be nailed to the rafters or roof trusses. The result could be a poorly attached roof surface, more vulnerable to wind damage.
How long do a roof last on a house?
Your asphalt roof is about 20 years old For a standard 3-tab asphalt shingle roof, that’s 25-years. As long as your roof has been properly ventilated and installed you should get pretty close to that 25 years of roof life.
Should old roofing felt be removed?
The waterproof nature of the felt ensures you keep your shed dry and increases its lifespan. You need to ensure you are installing the felt correctly though by removing any old felt, fixing any issues and the using clout nails as well as adhesive where required.
How long would plywood last outside?
Plywood is characterized by great durability, but how long exactly a plywood will last outside depends on several factors. Usually, the average life expectancy of exterior plywood constructions is around 35 years if everything is finished properly, but sometimes it can also reach up to 50 years.
When should I Redeck my roof?
If you are having your roof changed from wooden shakes or shingles to asphalt shingles, you will need to redeck over the old decking to bring your home up to code.
How long should roof sheathing 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.
What is better for roofing OSB or plywood?
Plywood Holds the Moisture Advantage Over OSB When plywood gets wet, it tends to swell. OSB takes longer than plywood to get saturated, but also takes much longer to dry out. When used as roof sheathing, this tendency to hold moisture means it will degrade faster than plywood when exposed to chronic leaks.
What is the difference between sheeting and sheathing?
As nouns the difference between sheathing and sheeting is that sheathing is something that wraps around or surrounds something, as a sheath encases its blade while sheeting is fabric used to make sheets (bedding).
Should I Resheet my roof?
Your New Roof The most efficient and cost effective option is to resheet directly over the shiplap with exterior grade plywood. This is acceptable by code, as well as the roofing manufacturers. And when you need a new roof, you need it to be installed correctly.
What 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 thickness plywood do you use on a roof?
Most roofs will be sheathed in plywood at least 3/8 inch thick. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. Loads will vary with the pitch of the roof; the flatter the roof, the greater the load on any one section. Steeper roofs will have lighter loads per square foot.
